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Ozerova VV, Zhidkov IS, Emelianov NA, Korchagin DV, Shilov GV, Prudnov FA, Sedov IV, Kurmaev EZ, Frolova LA, Troshin PA. Enhancing Photostability of Complex Lead Halides through Modification with Antibacterial Drug Octenidine. Materials (Basel) 2023; 17:129. [PMID: 38203983 PMCID: PMC10780031 DOI: 10.3390/ma17010129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/12/2023] [Accepted: 12/20/2023] [Indexed: 01/12/2024]
Abstract
The high power-conversion efficiencies of hybrid perovskite solar cells encourage many researchers. However, their limited photostability represents a serious obstacle to the commercialization of this promising technology. Herein, we present an efficient method for improving the intrinsic photostability of a series of commonly used perovskite material formulations such as MAPbI3, FAPbI3, Cs0.12FA0.88PbI3, and Cs0.10MA0.15FA0.75PbI3 through modification with octenidine dihydroiodide (OctI2), which is a widely used antibacterial drug with two substituted pyridyl groups and two cationic centers in its molecular framework. The most impressive stabilizing effects were observed in the case of FAPbI3 and Cs0.12FA0.88PbI3 absorbers that were manifested in significant suppression or even blocking of the undesirable perovskite films' recrystallization and other decomposition pathways upon continuous 110 mW/cm2 light exposure. The achieved material photostability-within 9000 h for the Oct(FA)n-1PbnI3n+1 (n = 40-400) and 20,000 h for Oct(Cs0.12FA0.88)n-1PbnI3n+1 (where n = 40-400) formulations-matches the highest values ever reported for complex lead halides. It is important to note that the stabilizing effect is maintained when OctI2 is used only as a perovskite surface-modifying agent. Using a two-cation perovskite composition as an example, we showed that the performances of the solar cells based on the developed Oct(Cs0.12FA0.88)399Pb400I1201 absorber material are comparable to that of the reference devices based on the unmodified perovskite composition. These findings indicate a great potential of the proposed approach in the design of new highly photostable and efficient light absorbers. We believe that the results of this study will also help to establish important guidelines for the rational material design to improve the operational stability of perovskite solar cells.
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Affiliation(s)
- Victoria V. Ozerova
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
| | - Ivan S. Zhidkov
- Institute of Physics and Technology, Ural Federal University, 19 ul. Mira, 620002 Yekaterinburg, Russia (E.Z.K.)
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 ul. S. Kovalevskoi, 620108 Yekaterinburg, Russia
| | - Nikita A. Emelianov
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
| | - Denis V. Korchagin
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
| | - Gennady V. Shilov
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
| | - Fedor A. Prudnov
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
| | - Igor V. Sedov
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
| | - Ernst Z. Kurmaev
- Institute of Physics and Technology, Ural Federal University, 19 ul. Mira, 620002 Yekaterinburg, Russia (E.Z.K.)
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 ul. S. Kovalevskoi, 620108 Yekaterinburg, Russia
| | - Lyubov A. Frolova
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
| | - Pavel A. Troshin
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 prosp. Semenova, 142432 Chernogolovka, Russia; (V.V.O.); (N.A.E.); (D.V.K.); (G.V.S.); (F.A.P.); (I.V.S.)
- Zhengzhou Research Institute, Harbin Institute of Technology, Longyuan East 7th 26, Jinshui District, Zhengzhou 450003, China
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Rasmetyeva AV, Zyryanov SS, Novoselov IE, Kukharenko AI, Makarov EV, Cholakh SO, Kurmaev EZ, Zhidkov IS. Proton Irradiation on Halide Perovskites: Numerical Calculations. Nanomaterials (Basel) 2023; 14:1. [PMID: 38202456 PMCID: PMC10780994 DOI: 10.3390/nano14010001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 01/12/2024]
Abstract
The results of numerical SRIM and SCAPS calculations for the ionization, displacement and heating of hybrid perovskites under the influence of protons (E = 0.15, 3.0 and 18 MeV) are presented and show that the lowest transfer energy is demonstrated by the MAPbI3, FAPbBr3 and FAPbI3 compounds, which represent the greatest potential for use as solar cells in space devices. On the other hand, it is found that perovskite compositions containing FA and Cs and with mixed cations are the most stable from the point of view of the formation of vacancies and phonons and are also promising as radiation-resistant materials with respect to powerful proton fluxes. Taking into account the lateral distribution of proton tracks showed that, at an energy level of several MeV, the release of their energy can be considered uniform over the depth and area of the entire solar cell, suggesting that the simple protection by plastic films from the low-energy protons is sufficient.
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Affiliation(s)
- Alexandra V. Rasmetyeva
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, 620002 Yekaterinburg, Russia
| | - Stepan S. Zyryanov
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, 620002 Yekaterinburg, Russia
| | - Ivan E. Novoselov
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, 620002 Yekaterinburg, Russia
| | - Andrey I. Kukharenko
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 Street, 620108 Yekaterinburg, Russia
| | - Efrem V. Makarov
- Institute of Electrophysics of Ural Branch of Russian Academy of Sciences, Amundsena 106 Street, 620110 Yekaterinburg, Russia
| | - Seif O. Cholakh
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, 620002 Yekaterinburg, Russia
| | - Ernst Z. Kurmaev
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 Street, 620108 Yekaterinburg, Russia
| | - Ivan S. Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 Street, 620108 Yekaterinburg, Russia
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Lin Y, Chen C, Wang Y, Yu M, Yang J, Ni I, Lin B, Zhidkov IS, Kurmaev EZ, Lu Y, Chueh C. Realizing High Brightness Quasi-2D Perovskite Light-Emitting Diodes with Reduced Efficiency Roll-Off via Multifunctional Interface Engineering. Adv Sci (Weinh) 2023; 10:e2302232. [PMID: 37400366 PMCID: PMC10502845 DOI: 10.1002/advs.202302232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 06/21/2023] [Indexed: 07/05/2023]
Abstract
Quasi-2D perovskites have recently flourished in the field of luminescence due to the quantum-confinement effect and the efficient energy transfer between different n phases resulting in exceptional optical properties. However, owing to the lower conductivity and poor charge injection, quasi-2D perovskite light-emitting diodes (PeLEDs) typically suffer from low brightness and high-efficiency roll-off at high current densities compared to 3D perovskite-based PeLEDs, which is undoubtedly one of the most critical issues in this field. In this work, quasi-2D PeLEDs with high brightness, reduced trap density, and low-efficiency roll-off are successfully demonstrated by introducing a thin layer of conductive phosphine oxide at the perovskite/electron transport layer interface. The results surprisingly show that this additional layer does not improve the energy transfer between multiple quasi-2D phases in the perovskite film, but purely improves the electronic properties of the perovskite interface. On the one hand, it passivates the surface defects of the perovskite film; on the other hand, it promotes electron injection and prevents hole leakage across this interface. As a result, the modified quasi-2D pure Cs-based device shows a maximum brightness of > 70,000 cd m-2 (twice that of the control device), a maximum external quantum efficiency (EQE) of > 10% and a much lower efficiency roll-off at high bias voltages.
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Affiliation(s)
- Yu‐Kuan Lin
- Department of Chemical EngineeringNational Taiwan UniversityTaipei10617Taiwan
| | - Chiung‐Han Chen
- Department of Chemical EngineeringNational Taiwan UniversityTaipei10617Taiwan
| | - Yen‐Yu Wang
- Research Center for Applied SciencesAcademia SinicaTaipei11529Taiwan
| | - Ming‐Hsuan Yu
- Department of Chemical EngineeringNational Taiwan UniversityTaipei10617Taiwan
| | - Jing‐Wei Yang
- Research Center for Applied SciencesAcademia SinicaTaipei11529Taiwan
| | - I‐Chih Ni
- Graduate Institute of Photonics and OptoelectronicsNational Taiwan UniversityTaipei10617Taiwan
| | - Bi‐Hsuan Lin
- National Synchrotron Radiation Research CenterHsinchu30076Taiwan
| | - Ivan S. Zhidkov
- Institute of Physics and TechnologyUral Federal UniversityYekaterinburg620002Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of SciencesYekaterinburg620108Russia
| | - Ernst Z. Kurmaev
- Institute of Physics and TechnologyUral Federal UniversityYekaterinburg620002Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of SciencesYekaterinburg620108Russia
| | - Yu‐Jung Lu
- Research Center for Applied SciencesAcademia SinicaTaipei11529Taiwan
- Department of PhysicsNational Taiwan UniversityTaipei10617Taiwan
| | - Chu‐Chen Chueh
- Department of Chemical EngineeringNational Taiwan UniversityTaipei10617Taiwan
- Advanced Research Center for Green Materials Science and TechnologyNational Taiwan UniversityTaipei10617Taiwan
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Shchurik EV, Kraevaya OA, Vasil'ev SG, Zhidkov IS, Kurmaev EZ, Shestakov AF, Troshin PA. Anthraquinone-Quinizarin Copolymer as a Promising Electrode Material for High-Performance Lithium and Potassium Batteries. Molecules 2023; 28:5351. [PMID: 37513224 PMCID: PMC10384886 DOI: 10.3390/molecules28145351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 06/20/2023] [Accepted: 07/03/2023] [Indexed: 07/30/2023] Open
Abstract
The growing demand for cheap, safe, recyclable, and environmentally friendly batteries highlights the importance of the development of organic electrode materials. Here, we present a novel redox-active polymer comprising a polyaniline-type conjugated backbone and quinizarin and anthraquinone units. The synthesized polymer was explored as a cathode material for batteries, and it delivered promising performance characteristics in both lithium and potassium cells. Excellent lithiation efficiency enabled high discharge capacity values of >400 mA g-1 in combination with good stability upon charge-discharge cycling. Similarly, the potassium cells with the polymer-based cathodes demonstrated a high discharge capacity of >200 mAh g-1 at 50 mA g-1 and impressive stability: no capacity deterioration was observed for over 3000 cycles at 11 A g-1, which was among the best results reported for K ion battery cathodes to date. The synthetic availability and low projected cost of the designed material paves a way to its practical implementation in scalable and inexpensive organic batteries, which are emerging as a sustainable energy storage technology.
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Affiliation(s)
- Elena V Shchurik
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry RAS, 1 Prospekt Akademika Semenova, 142432 Chernogolovka, Russia
- Higher Chemical College of RAS, D.I. Mendeleev University of Chemical Technology of Russia, 9 Miusskaya square, 125047 Moscow, Russia
| | - Olga A Kraevaya
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry RAS, 1 Prospekt Akademika Semenova, 142432 Chernogolovka, Russia
| | - Sergey G Vasil'ev
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry RAS, 1 Prospekt Akademika Semenova, 142432 Chernogolovka, Russia
| | - Ivan S Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira 19 Str., 620002 Yekaterinburg, Russia
| | - Ernst Z Kurmaev
- Institute of Physics and Technology, Ural Federal University, Mira 19 Str., 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 Str., 620108 Yekaterinburg, Russia
| | - Alexander F Shestakov
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry RAS, 1 Prospekt Akademika Semenova, 142432 Chernogolovka, Russia
- Faculty of Fundamental Physics & Chemical Engineering, Lomonosov Moscow State University, GSP 1, 1-51 Leninskie Gory, 119991 Moscow, Russia
| | - Pavel A Troshin
- Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry RAS, 1 Prospekt Akademika Semenova, 142432 Chernogolovka, Russia
- Zhengzhou Research Institute, Harbin Institute of Technology, Longyuan East 7th 26, Jinshui District, Zhengzhou 450003, China
- Harbin Institute of Technology, No.92 West Dazhi Street, Nan Gang District, Harbin 150001, China
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5
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Zhidkov IS, Yu MH, Kukharenko AI, Han PC, Cholakh SO, Yu WY, Wu KCW, Chueh CC, Kurmaev EZ. The Stability of Hybrid Perovskites with UiO-66 Metal-Organic Framework Additives with Heat, Light, and Humidity. Nanomaterials (Basel) 2022; 12:4349. [PMID: 36500972 PMCID: PMC9735478 DOI: 10.3390/nano12234349] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/24/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
This study is devoted to investigating the stability of metal-organic framework (MOF)-hybrid perovskites consisting of CH3NH3PbI3 (MAPbI3) and UiO-66 without a functional group and UiO-66 with different COOH, NH2,and F functional groups under external influences including heat, light, and humidity. By conducting crystallinity, optical, and X-ray photoelectron spectra (XPS) measurements after long-term aging, all of the prepared MAPbI3@UiO-66 nanocomposites (with pristine UiO-66 or UiO-66 with additional functional groups) were stable to light soaking and a relative humidity (RH) of 50%. Moreover, the UiO-66 and UiO-66-(F)4 hybrid perovskite films possessed a higher heat tolerance than the other two UiO-66 with the additional functional groups of NH2 and COOH. Tthe MAPbI3@UiO-66-(F)4 delivered the highest stability and improved optical properties after aging. This study provides a deeper understanding of the impact of the structure of hybrid MOFs on the stability of the composite films.
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Affiliation(s)
- Ivan S. Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Yekaterinburg, Russia
| | - Ming-Hsuan Yu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Andrey I. Kukharenko
- Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Yekaterinburg, Russia
| | - Po-Chun Han
- Program of Green Materials and Precision Devices, International Graduate Program of Molecular Science and Technology, Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - Seif O. Cholakh
- Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
| | - Wen-Yueh Yu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan
| | - Kevin C.-W. Wu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Program of Green Materials and Precision Devices, International Graduate Program of Molecular Science and Technology, Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - Chu-Chen Chueh
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan
| | - Ernst Z. Kurmaev
- Institute of Physics and Technology, Ural Federal University, Mira St. 19, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Yekaterinburg, Russia
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Emelianov NA, Ozerova VV, Zhidkov IS, Korchagin DV, Shilov GV, Litvinov AL, Kurmaev EZ, Frolova LA, Aldoshin SM, Troshin PA. Nanoscale Visualization of Photodegradation Dynamics of MAPbI 3 Perovskite Films. J Phys Chem Lett 2022; 13:2744-2749. [PMID: 35315674 DOI: 10.1021/acs.jpclett.2c00497] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Herein, we report the nanoscale visualization of the photochemical degradation dynamics of MAPbI3 (MA = CH3NH3+) using infrared scattering scanning near-field microscopy (IR s-SNOM) combined with a series of complementary analytical techniques such as UV-vis and FTIR-spectroscopy, XRD, and XPS. Light exposure of the MAPbI3 films resulted in a gradual loss of MA+ cations starting from the grain boundaries at the film surface and slowly progressing toward the center of the grains and deeper into the bulk perovskite phase. The binary lead iodide PbI2 was found to be the major perovskite photochemical degradation product under the experimental conditions used. Interestingly, the formation of the PbI2 skin over the perovskite grains resulted in a largely enhanced photoluminescence, which resembles the effects observed for core-shell quantum dots. The obtained results demonstrate that IR s-SNOM represents a powerful technique for studying the spatially resolved degradation dynamics of perovskite absorbers and revealing the associated material aging pathways.
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Affiliation(s)
- Nikita A Emelianov
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
| | - Victoria V Ozerova
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
- Higher Chemical College of Russian Academy of Sciences, D. I. Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125947 Moscow, Russia
| | - Ivan S Zhidkov
- Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Yekaterinburg, Russia
| | - Denis V Korchagin
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
| | - Gennady V Shilov
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
| | - Alexey L Litvinov
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
| | - Ernst Z Kurmaev
- Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Yekaterinburg, Russia
| | - Lyubov A Frolova
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
| | - Sergey M Aldoshin
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
| | - Pavel A Troshin
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Semenov Prospect 1, 141432 Chernogolovka, Moscow Region, Russia
- Faculty of Chemistry, Silesian University of Technology, Strzody 9, 44-100 Gliwice, Poland
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Boukhvalov DW, Zhidkov IS, Kiryakov A, Menéndez JL, Fernández-García L, Kukharenko AI, Cholakh SO, Zatsepin AF, Kurmaev EZ. Unveiling the Atomic and Electronic Structure of Stacked-Cup Carbon Nanofibers. Nanoscale Res Lett 2021; 16:153. [PMID: 34633574 PMCID: PMC8505591 DOI: 10.1186/s11671-021-03595-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 08/18/2021] [Indexed: 06/13/2023]
Abstract
We report results of comprehensive experimental exploration (X-ray photoemission, Raman and optical spectroscopy) of carbon nanofibers (CNFs) in combination with first-principles modeling. Core-level spectra demonstrate prevalence of sp2 hybridization of carbon atoms in CNF with a trace amount of carbon-oxygen bonds. The density functional theory (DFT)-based calculations demonstrated no visible difference between mono- and bilayers because σ-orbitals are related to in-plane covalent bonds. The influence of the distortions on π-peak is found to be significant only for bilayers as a result of π-π interlayer bonds formation. These results are supported by both experimental Raman and XPS valence band spectra. The combination of optical measurements with a theoretical modeling indicates the formation of optically active graphene quantum dots (GQDs) in the CNF matrix, with a radiative relaxation of the excited π* state. The calculated electronic structure of these GQDs is in quantitative agreement with the measured optical transitions and provides an explanation of the absence of visible contribution from these GQDs to the measured valence bands spectra.
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Affiliation(s)
- D W Boukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing, 210037, People's Republic of China.
- Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia, 620002.
| | - I S Zhidkov
- Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia, 620002
- M.N. Mikheev Institute of Metal Physics, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia, 620108
| | - A Kiryakov
- Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia, 620002
| | - J L Menéndez
- Centro de Investigación en Nanomateriales Y Nanotecnología, Consejo Superior de Investigaciones Científicas (CSIC)-Universidad de Oviedo (UO)-Principado de Asturias, Avenida de la Vega 4-6, El Entrego, 33940, San Martin del Rey Aurelio, Asturias, Spain
| | - L Fernández-García
- Centro de Investigación en Nanomateriales Y Nanotecnología, Consejo Superior de Investigaciones Científicas (CSIC)-Universidad de Oviedo (UO)-Principado de Asturias, Avenida de la Vega 4-6, El Entrego, 33940, San Martin del Rey Aurelio, Asturias, Spain
| | - A I Kukharenko
- Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia, 620002
| | - S O Cholakh
- Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia, 620002
| | - A F Zatsepin
- Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia, 620002
| | - E Z Kurmaev
- Institute of Physics and Technology, Ural Federal University, Yekaterinburg, Russia, 620002
- M.N. Mikheev Institute of Metal Physics, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia, 620108
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Akbulatov AF, Ustinova MI, Shilov GV, Dremova NN, Zhidkov IS, Kurmaev EZ, Frolova LA, Shestakov AF, Aldoshin SM, Troshin PA. Temperature Dynamics of MAPbI 3 and PbI 2 Photolysis: Revealing the Interplay between Light and Heat, Two Enemies of Perovskite Photovoltaics. J Phys Chem Lett 2021; 12:4362-4367. [PMID: 33938752 DOI: 10.1021/acs.jpclett.1c00883] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Regardless of the impressive photovoltaic performances demonstrated for lead halide perovskite solar cells, their practical implementation is severely impeded by the low device stability. Complex lead halides are sensitive to both light and heat, which are unavoidable under realistic solar cell operational conditions. Suppressing these intrinsic degradation pathways requires a thorough understanding of their mechanistic aspects. Herein, we explored the temperature effects in the light-induced decomposition of MAPbI3 and PbI2 thin films under anoxic conditions. The analysis of the aging kinetics revealed that MAPbI3 photolysis and PbI2 photolysis have quite high effective activation energies of ∼85 and ∼106 kJ mol-1, respectively, so decreasing the temperature from 55 to 30 °C can extend the perovskite lifetime by factors of >10-100. These findings suggest that controlling the temperature of the perovskite solar panels might allow the long operational lifetimes (>20 years) required for the practical implementation of this promising technology.
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Affiliation(s)
- Azat F Akbulatov
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
| | - Marina I Ustinova
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
| | - Gennady V Shilov
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
| | - Nadezhda N Dremova
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
| | - Ivan S Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, Yekaterinburg 620002, Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 Street, Yekaterinburg 620990, Russia
| | - Ernst Z Kurmaev
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, Yekaterinburg 620002, Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 Street, Yekaterinburg 620990, Russia
| | - Lyubov A Frolova
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
| | - Alexander F Shestakov
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
| | - Sergey M Aldoshin
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
| | - Pavel A Troshin
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russia
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9
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Frolova LA, Davlethanov AI, Dremova NN, Zhidkov I, Akbulatov AF, Kurmaev EZ, Aldoshin SM, Stevenson KJ, Troshin PA. Efficient and Stable MAPbI 3-Based Perovskite Solar Cells Using Polyvinylcarbazole Passivation. J Phys Chem Lett 2020; 11:6772-6778. [PMID: 32689804 DOI: 10.1021/acs.jpclett.0c01776] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Hybrid perovskite solar cells attract a great deal of attention due to the feasibility of their low-cost production and their demonstration of impressive power conversion efficiencies (PCEs) exceeding 25%. However, the insufficient intrinsic stability of lead halides under light soaking and thermal stress impedes practical implementation of this technology. Herein, we show that the photothermal aging of a widely used perovskite light absorber such as MAPbI3 can be suppressed significantly by using polyvinylcarbazole (PVC) as a stabilizing agent. By applying a few complementary methods, we reveal that the PVC additive leads to passivation of defects in the absorber material. Introducing an optimal content of PVC into MAPbI3 delivers a PCE of 18.7% in combination with a significantly improved solar cell operational lifetime: devices retained ∼70% of the initial efficiency after light soaking for 1500 h, whereas the control samples without PVC degraded almost completely under the same conditions.
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Affiliation(s)
- Lyubov A Frolova
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia
- IPCP RAS, Semenov Prospect 1, Chernogolovka 142432, Russia
| | | | | | - Ivan Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira st. 19, Yekaterinburg 620002, Russia
| | | | - Ernst Z Kurmaev
- Institute of Physics and Technology, Ural Federal University, Mira st. 19, Yekaterinburg 620002, Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi st. 18, Yekaterinburg 620990, Russia
| | | | - Keith J Stevenson
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia
| | - Pavel A Troshin
- Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia
- IPCP RAS, Semenov Prospect 1, Chernogolovka 142432, Russia
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10
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Zhidkov IS, Kurmaev EZ, Cholakh SO, Fazio E, D’Urso L. XPS study of interactions between linear carbon chains and colloidal Au nanoparticles. Mendeleev Communications 2020. [DOI: 10.1016/j.mencom.2020.05.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Boldyreva AG, Zhidkov IS, Tsarev S, Akbulatov AF, Tepliakova MM, Fedotov YS, Bredikhin SI, Postnova EY, Luchkin SY, Kurmaev EZ, Stevenson KJ, Troshin PA. Unraveling the Impact of Hole Transport Materials on Photostability of Perovskite Films and p-i-n Solar Cells. ACS Appl Mater Interfaces 2020; 12:19161-19173. [PMID: 32233360 DOI: 10.1021/acsami.0c01027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigated the impact of a series of hole transport layer (HTL) materials such as Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), NiOx, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA), and polytriarylamine (PTA) on photostability of thin films and solar cells based on MAPbI3, Cs0.15FA0.85PbI3, Cs0.1MA0.15FA0.75PbI3, Cs0.1MA0.15FA0.75Pb(Br0.15I0.85)3, and Cs0.15FA0.85Pb(Br0.15I0.85)3 complex lead halides. Mixed halide perovskites showed reduced photostability in comparison with similar iodide-only compositions. In particular, we observed light-induced recrystallization of all perovskite films except MAPbI3 with the strongest effects revealed for Br-containing systems. Moreover, halide and β FAPbI3 phase segregations were also observed mostly in mixed-halide systems. Interestingly, coating perovskite films with the PCBM layer spectacularly suppressed light-induced growth of crystalline domains as well as segregation of Br-rich and I-rich phases or β FAPbI3. We strongly believe that all three effects are promoted by the light-induced formation of surface defects, which are healed by adjacent PCBM coating. While comparing different hole-transport materials, we found that NiOx and PEDOT:PSS are the least suitable HTLs because of their interfacial (photo)chemical interactions with perovskite absorbers. On the contrary, polyarylamine-type HTLs PTA and PTAA form rather stable interfaces, which makes them the best candidates for durable p-i-n perovskite solar cells. Indeed, multilayered ITO/PTA(A)/MAPbI3/PCBM stacks revealed no aging effects within 1000 h of continuous light soaking and delivered stable and high power conversion efficiencies in solar cells. The obtained results suggest that using polyarylamine-type HTLs and simple single-phase perovskite compositions pave a way for designing stable and efficient perovskite solar cells.
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Affiliation(s)
| | - Ivan S Zhidkov
- Russia Institute of Physics and Technology, Ural Federal University, Mira 9 str., 620002 Yekaterinburg, Russia
- M.N.Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 str., 620108 Yekaterinburg, Russia
| | - Sergey Tsarev
- Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
| | - Azat F Akbulatov
- IPCP RAS, Semenov Prospect 1, Chernogolovka, 142432 Moscow Region, Russia
| | - Marina M Tepliakova
- Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
| | - Yury S Fedotov
- Institute of Solid State Physics of Russian Academy of Science (ISSP RAS), Chernogolovka, 142432 Moscow Region, Russia
| | - Sergey I Bredikhin
- Institute of Solid State Physics of Russian Academy of Science (ISSP RAS), Chernogolovka, 142432 Moscow Region, Russia
| | - Evgeniya Yu Postnova
- Institute of Solid State Physics of Russian Academy of Science (ISSP RAS), Chernogolovka, 142432 Moscow Region, Russia
| | - Sergey Yu Luchkin
- Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
| | - Ernst Z Kurmaev
- Russia Institute of Physics and Technology, Ural Federal University, Mira 9 str., 620002 Yekaterinburg, Russia
- M.N.Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 str., 620108 Yekaterinburg, Russia
| | - Keith J Stevenson
- Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
| | - Pavel A Troshin
- Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
- IPCP RAS, Semenov Prospect 1, Chernogolovka, 142432 Moscow Region, Russia
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12
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Boldyreva AG, Frolova LA, Zhidkov IS, Gutsev LG, Kurmaev EZ, Ramachandran BR, Petrov VG, Stevenson KJ, Aldoshin SM, Troshin PA. Unravelling the Material Composition Effects on the Gamma Ray Stability of Lead Halide Perovskite Solar Cells: MAPbI 3 Breaks the Records. J Phys Chem Lett 2020; 11:2630-2636. [PMID: 32178515 DOI: 10.1021/acs.jpclett.0c00581] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this work, we report a comparative study of the gamma ray stability of perovskite solar cells based on a series of perovskite absorbers including MAPbI3 (MA = methylammonium), MAPbBr3, Cs0.15FA0.85PbI3 (FA = formamidinim), Cs0.1MA0.15FA0.75PbI3, CsPbI3, and CsPbBr3. We reveal that the composition of the perovskite material strongly affects the radiation stability of the solar cells. In particular, solar cells based on the MAPbI3 were found to be the most resistant to gamma rays since this perovskite undergoes rapid self-healing due to the special gas-phase chemistry analyzed with ab initio calculations. The fact that the solar cells based on MAPbI3 can withstand a 1000 kRad gamma ray dose without any noticeable degradation of the photovoltaic properties is particularly exciting and shifts the paradigm of research in this field toward designing more dynamic rather than intrinsically robust (e.g., inorganic) materials.
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Affiliation(s)
| | - Lyubov A Frolova
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (ICP RAS), Semenov prospect 1, Chernogolovka 142432, Russia
| | - Ivan S Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira 19 str., 620002 Yekaterinburg, Russia
| | - Lavrenty G Gutsev
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (ICP RAS), Semenov prospect 1, Chernogolovka 142432, Russia
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272, United States
| | - Ernst Z Kurmaev
- Institute of Physics and Technology, Ural Federal University, Mira 19 str., 620002 Yekaterinburg, Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 str., 620108 Yekaterinburg, Russia
| | - Bala R Ramachandran
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272, United States
| | - Vladimir G Petrov
- Lomonosov Moscow State University, Department of Chemistry, Lelinsky Gory, 1 bld. 3, Moscow 119991, Russia
| | - Keith J Stevenson
- Skolkovo Institute of Science and Technology, Nobel street 3, Moscow 143026, Russia
| | - Sergey M Aldoshin
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (ICP RAS), Semenov prospect 1, Chernogolovka 142432, Russia
| | - Pavel A Troshin
- Skolkovo Institute of Science and Technology, Nobel street 3, Moscow 143026, Russia
- Institute for Problems of Chemical Physics of the Russian Academy of Sciences (ICP RAS), Semenov prospect 1, Chernogolovka 142432, Russia
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13
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Zhidkov IS, Poteryaev AI, Kukharenko AI, Finkelstein LD, Cholakh SO, Akbulatov AF, Troshin PA, Chueh CC, Kurmaev EZ. XPS evidence of degradation mechanism in CH 3NH 3PbI 3 hybrid perovskite. J Phys Condens Matter 2020; 32:095501. [PMID: 31722319 DOI: 10.1088/1361-648x/ab576f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, we investigate the photo-/thermal degradation mechanism of hybrid perovskites by using x-ray photoelectron (XPS) valence band (VB) spectra coupling with density functional theory (DFT) calculations. Herein, CH3NH3PbI3 is respectively subjected to irradiation with visible light and annealing at an exposure of 0-1000 h. It is found from XPS survey spectra that, in both cases (irradiation and annealing), a decrease in the I:Pb ratio is observed with aging time, which unambiguously indicates the formation of PbI2 as the product of photo/thermal degradation. The comparison of the XPS VB spectra of irradiated and annealed perovskites with the DFT calculations of CH3NH3PbI3 and PbI2 compounds have showed a systematic decrease in the contribution of I-5p states, which allows us to determine the respective threshold for degradation, which is 500 h for light irradiation and 200 h for annealing. This discrepancy might be due to the fact that the relaxation of thermal excitations of the system is carried out only by the phonons (which are non-radiative physical processes) while the radiative processes occurred during the photoexcitation will elastically or inelastically divert part of the external energy from the system to reduce its impact on perovskite degradation.
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Affiliation(s)
- Ivan S Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira 19 Str., 620002, Yekaterinburg, Russia
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14
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Akbulatov AF, Frolova LA, Dremova NN, Zhidkov I, Martynenko VM, Tsarev SA, Luchkin SY, Kurmaev EZ, Aldoshin SM, Stevenson KJ, Troshin PA. Light or Heat: What Is Killing Lead Halide Perovskites under Solar Cell Operation Conditions? J Phys Chem Lett 2020; 11:333-339. [PMID: 31838849 DOI: 10.1021/acs.jpclett.9b03308] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the first systematic assessment of intrinsic photothermal stability of a large panel of complex lead halides APbX3 incorporating different univalent cations (A = CH3NH3+, [NH2CHNH2]+, Cs+) and halogen anions (X = Br, I) using a series of analytical techniques such as UV-vis and X-ray photoelectron spectroscopy, X-ray diffraction, EDX analysis, atomic force and scanning electron microscopy, ESR spectroscopy, and mass spectrometry. We show that heat stress and light soaking induce a severe degradation of perovskite films even in the absence of oxygen and moisture. The stability of complex lead halides increases in the order MAPbBr3 < MAPbI3 < FAPbI3 < FAPbBr3 < CsPbI3 < CsPbBr3, thus featuring all-inorganic perovskites as the most promising absorbers for stable perovskite solar cells. An important correlation was found between the stability of the complex lead halides and the volatility of univalent cation halides incorporated in their structure. The established relationship provides useful guidelines for designing new complex metal halides with immensely improved stability.
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Affiliation(s)
- Azat F Akbulatov
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS) , Semenov Prospect 1 , Chernogolovka 142432 , Russia
| | - Lyubov A Frolova
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS) , Semenov Prospect 1 , Chernogolovka 142432 , Russia
- Center for Energy Science and Technology , Skolkovo Institute of Science and Technology , Nobel Street 3 , Moscow 143026 , Russia
| | - Nadezhda N Dremova
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS) , Semenov Prospect 1 , Chernogolovka 142432 , Russia
| | - Ivan Zhidkov
- Institute of Physics and Technology , Ural Federal University , Mira 19 Street , Yekaterinburg 620002 , Russia
| | - Vyacheslav M Martynenko
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS) , Semenov Prospect 1 , Chernogolovka 142432 , Russia
| | - Sergey A Tsarev
- Center for Energy Science and Technology , Skolkovo Institute of Science and Technology , Nobel Street 3 , Moscow 143026 , Russia
| | - Sergey Yu Luchkin
- Center for Energy Science and Technology , Skolkovo Institute of Science and Technology , Nobel Street 3 , Moscow 143026 , Russia
| | - Ernst Z Kurmaev
- Institute of Physics and Technology , Ural Federal University , Mira 19 Street , Yekaterinburg 620002 , Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences , South Kovalevskoi 18 Street , Yekaterinburg 620990 , Russia
| | - Sergey M Aldoshin
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS) , Semenov Prospect 1 , Chernogolovka 142432 , Russia
| | - Keith J Stevenson
- Center for Energy Science and Technology , Skolkovo Institute of Science and Technology , Nobel Street 3 , Moscow 143026 , Russia
| | - Pavel A Troshin
- The Institute for Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS) , Semenov Prospect 1 , Chernogolovka 142432 , Russia
- Center for Energy Science and Technology , Skolkovo Institute of Science and Technology , Nobel Street 3 , Moscow 143026 , Russia
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15
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Kapaev RR, Zhidkov IS, Kurmaev EZ, Stevenson KJ, Troshin PA. A nickel coordination polymer derived from 1,2,4,5-tetraaminobenzene for fast and stable potassium battery anodes. Chem Commun (Camb) 2020; 56:1541-1544. [DOI: 10.1039/c9cc07748k] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nickel coordination polymer derived from tetraaminobenzene was shown to be suitable for fast and stable potassium battery anodes working in a potential range of 0.5–2.0 V vs. K+/K.
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Affiliation(s)
- Roman R. Kapaev
- Center for Energy Science and Technology
- Skolkovo Institute of Science and Technology
- Moscow 143026
- Russia
- Institute for Problems of Chemical Physics RAS
| | - Ivan S. Zhidkov
- Institute of Physics and Technology
- Ural Federal University
- Yekaterinburg 620002
- Russia
| | - Ernst Z. Kurmaev
- Institute of Physics and Technology
- Ural Federal University
- Yekaterinburg 620002
- Russia
- M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
| | - Keith J. Stevenson
- Center for Energy Science and Technology
- Skolkovo Institute of Science and Technology
- Moscow 143026
- Russia
| | - Pavel A. Troshin
- Center for Energy Science and Technology
- Skolkovo Institute of Science and Technology
- Moscow 143026
- Russia
- Institute for Problems of Chemical Physics RAS
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16
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Boukhvalov DW, Zhidkov IS, Akbulatov AF, Kukharenko AI, Cholakh SO, Stevenson KJ, Troshin PA, Kurmaev EZ. Thermal Effects and Halide Mixing of Hybrid Perovskites: MD and XPS Studies. J Phys Chem A 2019; 124:135-140. [DOI: 10.1021/acs.jpca.9b09653] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Danil W. Boukhvalov
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, People’s Republic of China
- Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002 Yekaterinburg, Russia
| | - Ivan S. Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, Yekaterinburg 620002, Russia
| | | | - Andrey I. Kukharenko
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, Yekaterinburg 620002, Russia
| | - Seif O. Cholakh
- College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, People’s Republic of China
| | - Keith J. Stevenson
- Skolkovo Institute of Science and Technology, Nobel Street 3, Moscow 143026, Russian Federation
| | - Pavel A. Troshin
- IPCP RAS, Semenov Prospect 1, Chernogolovka 142432, Russia
- Skolkovo Institute of Science and Technology, Nobel Street 3, Moscow 143026, Russian Federation
| | - Ernst Z. Kurmaev
- Institute of Physics and Technology, Ural Federal University, Mira 19 Street, Yekaterinburg 620002, Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 Street, Yekaterinburg 620108, Russia
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17
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Zatsepin AF, Buntov EA, Zatsepin DA, Kurmaev EZ, Pustovarov VA, Ershov AV, Johnson NW, Moewes A. Energy band gaps and excited states in Si QD/SiO x /R y O z (R = Si, Al, Zr) suboxide superlattices. J Phys Condens Matter 2019; 31:415301. [PMID: 31292291 DOI: 10.1088/1361-648x/ab30d6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
X-ray and optical spectroscopies were applied in order to study the band structure and electronic excitations of the SiO x /R y O z (R = Si, Al, Zr) suboxide superlattices. The complementary x-ray emission and absorption measurements allow for the band gap values for the SiO x layers to be established, which are found to have almost no dependency on the cation type R. It is determined that, after annealing, the stoichiometric factor x remains near 1.8 in all the systems under study, implying that the silicon quantum dot synthesis reaction is not fully completed. It is shown that the SiO x /Al2O3 multilayer contains octahedral structural motifs (SiO6) usually found in stishovite, whereas SiO x /SiO2 and SiO x /ZrO2 demonstrate an electronic structure similar to conventional silica. The intrinsic electronic excited states are examined by means of synchrotron-excited photoluminescence spectroscopy. Low-energy UV-excited luminescence of SiO x layers is found to have the same spectrum in all of the studied structures, while VUV-excited spectra strongly depend on the cation R. In these measurements, manifestations of 'slow' exciton-mediated and 'fast' defect-related luminescence are distinguished using nanosecond time resolution. It is shown that both mobile and bounded excitons appear in the suboxide layer under 6.2 eV and 5.8 eV irradiation and then relax radiatively through the triplet-singlet transition of the neighbouring oxygen-deficient centers. The complete picture of the optical excitation and relaxation processes in these materials is illustrated in a general diagram depicting electronic states.
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Affiliation(s)
- Anatoly F Zatsepin
- Institute of Physics and Technology, Ural Federal University, 620002 Yekaterinburg, Russia
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18
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Obrezkov FA, Ramezankhani V, Zhidkov I, Traven VF, Kurmaev EZ, Stevenson KJ, Troshin PA. High-Energy and High-Power-Density Potassium Ion Batteries Using Dihydrophenazine-Based Polymer as Active Cathode Material. J Phys Chem Lett 2019; 10:5440-5445. [PMID: 31495174 DOI: 10.1021/acs.jpclett.9b02039] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Polymeric aromatic amines were shown to be very promising cathodes for lithium-ion batteries. Surprisingly, these materials are scarcely used for designing post-lithium batteries. In this Letter, we investigate the application of the high-voltage poly(N-phenyl-5,10-dihydrophenazine) (p-DPPZ) cathodes for K-ion batteries. The designed batteries demonstrate an impressive specific capacity of 162 mAh g-1 at the current density of 200 mA g-1, operate efficiently at high current densities of 2-10 A g-1, enabling charge and discharge within ∼1-4 min, and deliver the specific capacity of 125-145 mAh g-1 with a retention of 96 and 79% after 100 and 1000 charge-discharge cycles, respectively. Finally, these K-ion batteries with polymeric p-DPPZ cathodes showed rather outstanding specific power of >3 × 104 W kg-1, thus paving a way to the design of ultrafast and durable high-capacity metal-ion batteries matching the increasing demand for high power and high energy density electrochemical energy storage devices.
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Affiliation(s)
- Filipp A Obrezkov
- Skolkovo Institute of Science and Technology , Nobel St. 3 , Moscow 143026 , Russia
| | - Vahid Ramezankhani
- Skolkovo Institute of Science and Technology , Nobel St. 3 , Moscow 143026 , Russia
| | - Ivan Zhidkov
- Institute of Physics and Technology, Ural Federal University , Mira str. 19 , Yekaterinburg 620002 , Russia
| | - Valerii F Traven
- D. I. Mendeleev University of Chemical Technology of Russia , Miusskaya Sq. 9 , Moscow 125047 , Russia
| | - Ernst Z Kurmaev
- Institute of Physics and Technology, Ural Federal University , Mira str. 19 , Yekaterinburg 620002 , Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences , S. Kovalevskoi str. 18 , Yekaterinburg 620108 , Russia
| | - Keith J Stevenson
- Skolkovo Institute of Science and Technology , Nobel St. 3 , Moscow 143026 , Russia
| | - Pavel A Troshin
- Skolkovo Institute of Science and Technology , Nobel St. 3 , Moscow 143026 , Russia
- Institute for Problems of Chemical Physics of Russian Academy of Science , Acad. Semenov ave. 1 , Chernogolovka , Moscow Region 142432 , Russia
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19
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Leedahl B, McCloskey DJ, Boukhvalov DW, Zhidkov IS, Kukharenko AI, Kurmaev EZ, Cholakh SO, Gavrilov NV, Brinzari VI, Moewes A. Fundamental crystal field excitations in magnetic semiconductor SnO 2: Mn, Fe, Co, Ni. Phys Chem Chem Phys 2019; 21:11992-11998. [PMID: 31134978 DOI: 10.1039/c9cp01516g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Directly measuring elementary electronic excitations in dopant 3d metals is essential to understanding how they function as part of their host material. Through calculated crystal field splittings of the 3d electron band it is shown how transition metals Mn, Fe, Co, and Ni are incorporated into SnO2. The crystal field splittings are compared to resonant inelastic X-ray scattering (RIXS) experiments, which measure precisely these elementary dd excitations. The origin of spectral features can be determined and identified via this comparison, leading to an increased understanding of how such dopant metals situate themselves in, and modify the host's electronic and magnetic properties; and also how each element differs when incorporated into other semiconducting materials. We found that oxygen vacancy formation must not occur at nearest neighbour sites to metal atoms, but instead must reside at least two coordination spheres beyond. The coordination of the dopants within the host can then be explicitly related to the d-electron configurations and energies. This approach facilitates an understanding of the essential link between local crystal coordination and electronic/magnetic properties.
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Affiliation(s)
- B Leedahl
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada.
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20
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Sowa M, Parafiniuk M, Mouzêlo CM, Kazek-Kęsik A, Zhidkov IS, Kukharenko AI, Cholakh SO, Kurmaev EZ, Simka W. DC plasma electrolytic oxidation treatment of gum metal for dental implants. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.02.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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21
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Zhidkov IS, Maksimov RN, Kukharenko AI, Finkelstein LD, Cholakh SO, Osipov VV, Kurmaev EZ. Effect of post-annealing in air on optical and XPS spectra of Y2O3 ceramics doped with CeO2. Mendeleev Communications 2019. [DOI: 10.1016/j.mencom.2019.01.035] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Zhidkov IS, Akbulatov AF, Kukharenko AI, Cholakh SO, Stevenson KJ, Troshin PA, Kurmaev EZ. Influence of halide mixing on thermal and photochemical stability of hybrid perovskites: XPS studies. Mendeleev Communications 2018. [DOI: 10.1016/j.mencom.2018.07.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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23
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Manikandan D, Boukhvalov DW, Amirthapandian S, Zhidkov IS, Kukharenko AI, Cholakh SO, Kurmaev EZ, Murugan R. An insight into the origin of room-temperature ferromagnetism in SnO 2 and Mn-doped SnO 2 quantum dots: an experimental and DFT approach. Phys Chem Chem Phys 2018; 20:6500-6514. [PMID: 29445813 DOI: 10.1039/c7cp07182e] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SnO2 and Mn-doped SnO2 single-phase tetragonal crystal structure quantum dots (QDs) of uniform size with control over dopant composition and microstructure were synthesized using the high pressure microwave synthesis technique. On a broader vision, we systematically investigated the influence of dilute Mn ions in SnO2 under the strong quantum confinement regime through various experimental techniques and density functional theoretical (DFT) calculations to disclose the physical mechanism governing the observed ferromagnetism. DFT calculations revealed that the formation of the stable (001) surface was much more energetically favorable than that of the (100) surface, and the formation energy of the oxygen vacancies in the stable (001) surface was comparatively higher in the undoped SnO2 QDs. X-ray photoelectron spectroscopy (XPS) and first-principles modeling of doped QDs revealed that the lower doping concentration of Mn favored the formation of MnO-like (Mn2+) structures in defect-rich areas and the higher doping concentration of Mn led to the formation of multiple configurations of Mn (Mn2+ and Mn3+) in the stable surfaces of SnO2 QDs. Electronic absorption spectra indicated the characteristic spin allowed ligand field transitions of Mn2+ and Mn3+ and the red shift in the band gap. DFT calculations clearly indicated that only the substitutional dopant antiferromagnetic configurations were more energetically favorable. The gradual increase of magnetization at a low level of Mn-doping could be explained by the prevalence of antiferromagnetic manganese-vacancy pairs. Higher concentrations of Mn led to the appearance of ferromagnetic interactions between manganese and oxygen vacancies. The increase in the concentration of metallic dopants caused not just an increase in the total magnetic moment of the system but also changed the magnetic interactions between the magnetic moments on the metal ions and oxygen. The present study provides new insight into the fundamental understanding of the origin of ferromagnetism in transition metal-doped QDs.
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24
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Gapontsev VV, Kurmaev EZ, Sathish CI, Yun S, Park JG, Streltsov SV. Spectral and magnetic properties of Na 2RuO 3. J Phys Condens Matter 2017; 29:405804. [PMID: 28857048 DOI: 10.1088/1361-648x/aa7fd6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present measurements of resistivity, x-ray absorption (XAS) and emission (XES) spectroscopy together with ab initio band structure calculations for quasi two dimensional ruthenate Na2RuO3. Density function calculations (DFT) and XAS and XES spectra both show that Na2RuO3 is a semiconductor with an activation energy of ∼80 meV. Our DFT calculations reveal large magneto-elastic coupling in Na2RuO3 and predict that the ground state of Na2RuO3 should be antiferromagnetic zig-zag.
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Affiliation(s)
- Vladimir V Gapontsev
- M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620137, Ekaterinburg, Russia
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25
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Susarova DK, Akkuratov AV, Kukharenko AI, Cholakh SO, Kurmaev EZ, Troshin PA. ITO Modification for Efficient Inverted Organic Solar Cells. Langmuir 2017; 33:10118-10124. [PMID: 28873309 DOI: 10.1021/acs.langmuir.7b01106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We demonstrate a facile approach to designing transparent electron-collecting electrodes by depositing thin layers of medium and low work function metals on top of transparent conductive metal oxides (TCOs) such as ITO and FTO. The modified electrodes were fairly stable for months under ambient conditions and maintained their electrical characteristics. XPS spectroscopy data strongly suggested integration of the deposited metal in the TCO structure resulting in additional doping of the conducting oxide at the interface. Kelvin probe microscopy measurements revealed a significant decrease in the ITO work function after modification. Organic solar cells based on three different conjugated polymers have demonstrated state of the art performances in inverted device geometry using Mg- or Yb-modified ITO as electron collecting electrode. The simplicity of the proposed approach and the excellent ambient stability of the modified ITO electrodes allows one to expect their wide utilization in research laboratories and electronic industry.
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Affiliation(s)
- Diana K Susarova
- Institute for Problems of Chemical Physics of Russian Academy of Sciences , Semenov ave 1, Chernogolovka 142432, Moscow region, Russia
| | - Alexander V Akkuratov
- Institute for Problems of Chemical Physics of Russian Academy of Sciences , Semenov ave 1, Chernogolovka 142432, Moscow region, Russia
| | - Andrey I Kukharenko
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences , Yekaterinburg 620990, Russia
- Institute of Physics and Technology, Ural Federal University , Mira street 19, Yekaterinburg 620002, Russia
| | - Seif O Cholakh
- Institute of Physics and Technology, Ural Federal University , Mira street 19, Yekaterinburg 620002, Russia
| | - Ernst Z Kurmaev
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences , Yekaterinburg 620990, Russia
- Institute of Physics and Technology, Ural Federal University , Mira street 19, Yekaterinburg 620002, Russia
| | - Pavel A Troshin
- Institute for Problems of Chemical Physics of Russian Academy of Sciences , Semenov ave 1, Chernogolovka 142432, Moscow region, Russia
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center , 143026, Nobel st. 3, Moscow, Russia
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26
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Leedahl B, Boukhvalov DW, Kurmaev EZ, Kukharenko A, Zhidkov IS, Gavrilov NV, Cholakh SO, Le PH, Luo CW, Moewes A. Bulk vs. Surface Structure of 3d Metal Impurities in Topological Insulator Bi 2Te 3. Sci Rep 2017; 7:5758. [PMID: 28720873 PMCID: PMC5515884 DOI: 10.1038/s41598-017-06069-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 06/07/2017] [Indexed: 11/09/2022] Open
Abstract
Topological insulators have become one of the most prominent research topics in materials science in recent years. Specifically, Bi2Te3 is one of the most promising for technological applications due to its conductive surface states and insulating bulk properties. Herein, we contrast the bulk and surface structural environments of dopant ions Cr, Mn, Fe, Co, Ni, and Cu in Bi2Te3 thin films in order to further elucidate this compound. Our measurements show the preferred oxidation state and surrounding crystal environment of each 3d-metal atomic species, and how they are incorporated into Bi2Te3. We show that in each case there is a unique interplay between structural environments, and that it is highly dependant on the dopant atom. Mn impurities in Bi2Te3 purely substitute into Bi sites in a 2+ oxidation state. Cr atoms seem only to reside on the surface and are effectively not able to be absorbed into the bulk. Whereas for Co and Ni, an array of substitutional, interstitial, and metallic configurations occur. Considering the relatively heavy Cu atoms, metallic clusters are highly favourable. The situation with Fe is even more complex, displaying a mix of oxidation states that differ greatly between the surface and bulk environments.
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Affiliation(s)
- B Leedahl
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, S7N 5E2, Canada.
| | - D W Boukhvalov
- Department of Chemistry, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea.,Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002, Yekaterinburg, Russia
| | - E Z Kurmaev
- M.N.Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, S. Kovalevskoi 18 str., 620990, Yekaterinburg, Russia.,Institute of Physics and Technology, Ural Federal University, Mira 19 St., 620002, Yekaterinburg, Russia
| | - A Kukharenko
- Institute of Physics and Technology, Ural Federal University, Mira 19 St., 620002, Yekaterinburg, Russia
| | - I S Zhidkov
- Institute of Physics and Technology, Ural Federal University, Mira 19 St., 620002, Yekaterinburg, Russia
| | - N V Gavrilov
- Institute of Electrophysics, Russian Academy of Sciences-Ural Division, 620016, Yekaterinburg, Russia
| | - S O Cholakh
- Institute of Physics and Technology, Ural Federal University, Mira 19 St., 620002, Yekaterinburg, Russia
| | - P Huu Le
- Department of Electrophysics, National Chiao Tung University, Hsinchu, 30010, Taiwan, ROC.,Faculty of Basic Sciences, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho, Vietnam
| | - C Wei Luo
- Department of Electrophysics, National Chiao Tung University, Hsinchu, 30010, Taiwan, ROC
| | - A Moewes
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, S7N 5E2, Canada
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27
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Mallineni SSK, Boukhvalov DW, Zhidkov IS, Kukharenko AI, Slesarev AI, Zatsepin AF, Cholakh SO, Rao AM, Serkiz SM, Bhattacharya S, Kurmaev EZ, Podila R. Influence of dopants on the impermeability of graphene. Nanoscale 2017; 9:6145-6150. [PMID: 28447704 DOI: 10.1039/c7nr00949f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Graphene has attracted much attention as an impermeable membrane and a protective coating against oxidation. While many theoretical studies have shown that defect-free graphene is impermeable, in reality graphene inevitably has defects in the form of grain boundaries and vacancies. Here, we study the effects of N-dopants on the impermeability of few-layered graphene (FLG) grown on copper using chemical vapor deposition. The grain boundaries in FLG have minimal impact on their permeability to oxygen as they do not provide a continuous channel for gas transport due to high tortuosity. However, we experimentally show that the N-dopants in FLG display multiple configurations that create structural imperfections to selectively allow gas molecules to permeate. We used a comprehensive array of tools including Raman spectroscopy, X-ray photoelectron spectroscopy, optically stimulated electron emission measurements, and density functional theory of N-doped graphene on copper to elucidate the effects of dopant configuration on the impermeability of graphene. Our results clearly show that oxygen can permeate through graphene with non-graphitic nitrogen dopants that create pores in graphene and oxidize the underlying Cu substrate while graphitic nitrogen dopants do not show any changes compared to the pristine form. Furthermore, we observed that the work function of graphene can be tuned effectively by changing the dopant configuration.
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Affiliation(s)
- S S K Mallineni
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA.
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28
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Akbulatov AF, Luchkin SY, Frolova LA, Dremova NN, Gerasimov KL, Zhidkov IS, Anokhin DV, Kurmaev EZ, Stevenson KJ, Troshin PA. Probing the Intrinsic Thermal and Photochemical Stability of Hybrid and Inorganic Lead Halide Perovskites. J Phys Chem Lett 2017; 8:1211-1218. [PMID: 28220700 DOI: 10.1021/acs.jpclett.6b03026] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report a careful and systematic study of thermal and photochemical degradation of a series of complex haloplumbates APbX3 (X = I, Br) with hybrid organic (A+ = CH3NH3) and inorganic (A+ = Cs+) cations under anoxic conditions (i.e., without exposure to oxygen and moisture by testing in an inert glovebox environment). We show that the most common hybrid materials (e.g., MAPbI3) are intrinsically unstable with respect to the heat- and light-induced stress and, therefore, can hardly sustain the real solar cell operation conditions. On the contrary, the cesium-based all-inorganic complex lead halides revealed far superior stability and, therefore, provide an impetus for creation of highly efficient and stable perovskite solar cells that can potentially achieve pragmatic operational benchmarks.
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Affiliation(s)
| | - Sergey Yu Luchkin
- Skolkovo Institute of Science and Technology , Nobel Street 3, Moscow 143026, Russian Federation
| | | | | | - Kirill L Gerasimov
- Faculty of Fundamental Physical and Chemical Engineering, Moscow State University , Leninskie Gory, Moscow 119991, Russia
| | - Ivan S Zhidkov
- Institute of Physics and Technology, Ural Federal University , Mira 19 Street, Yekaterinburg 620002, Russia
| | - Denis V Anokhin
- IPCP RAS , Semenov Prospect 1, Chernogolovka 142432, Russia
- Faculty of Fundamental Physical and Chemical Engineering, Moscow State University , Leninskie Gory, Moscow 119991, Russia
| | - Ernst Z Kurmaev
- Institute of Physics and Technology, Ural Federal University , Mira 19 Street, Yekaterinburg 620002, Russia
- M. N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences , S. Kovalevskoi 18 Street, Yekaterinburg 620990, Russia
| | - Keith J Stevenson
- Skolkovo Institute of Science and Technology , Nobel Street 3, Moscow 143026, Russian Federation
| | - Pavel A Troshin
- IPCP RAS , Semenov Prospect 1, Chernogolovka 142432, Russia
- Skolkovo Institute of Science and Technology , Nobel Street 3, Moscow 143026, Russian Federation
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29
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Sowa M, Łastówka D, Kukharenko AI, Korotin DM, Kurmaev EZ, Cholakh SO, Simka W. Characterisation of anodic oxide films on zirconium formed in sulphuric acid: XPS and corrosion resistance investigations. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3369-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Babilas D, Urbańczyk E, Sowa M, Maciej A, Korotin DM, Zhidkov IS, Basiaga M, Krok-Borkowicz M, Szyk-Warszyńska L, Pamuła E, Kurmaev EZ, Cholakh SO, Simka W. On the electropolishing and anodic oxidation of Ti-15Mo alloy. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.01.218] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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31
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Leedahl B, Korolev AV, Zhidkov IS, Skornyakov SL, Anisimov VI, Belozerov AS, Kukharenko AI, Kurmaev EZ, Grokhovskii VI, Cholakh SO, Moewes A. Searching for pure iron in nature: the Chelyabinsk meteorite. RSC Adv 2016. [DOI: 10.1039/c6ra16598b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Herein we aimed to use thermomagnetic analysis (TMA) to determine the nature of iron and nickel in the Chelyabinsk meteorite, and their effect on the meteorite's magnetism.
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32
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Ketabi N, de Boer T, Karakaya M, Zhu J, Podila R, Rao AM, Kurmaev EZ, Moewes A. Tuning the electronic structure of graphene through nitrogen doping: experiment and theory. RSC Adv 2016. [DOI: 10.1039/c6ra07546k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Tuning the electronic properties of graphene by doping atoms into its lattice makes it more applicable for electronic devices.
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Affiliation(s)
- Niloofar Ketabi
- Department of Physics and Engineering Physics
- University of Saskatchewan
- Saskatoon
- Canada
| | - Tristan de Boer
- Department of Physics and Engineering Physics
- University of Saskatchewan
- Saskatoon
- Canada
| | - Mehmet Karakaya
- Department of Physics and Astronomy
- Clemson University
- Clemson
- USA
| | - Jingyi Zhu
- Department of Physics and Astronomy
- Clemson University
- Clemson
- USA
| | - Ramakrishna Podila
- Department of Physics and Astronomy
- Clemson University
- Clemson
- USA
- Clemson Nanomaterials Center
| | - Apparao M. Rao
- Department of Physics and Astronomy
- Clemson University
- Clemson
- USA
- Clemson Nanomaterials Center
| | - Ernst Z. Kurmaev
- X-ray Emission Spectroscopy Lab
- M.N. Mikheev Institute of Metal Physics
- RAS Ural Div
- 620990 Yekaterinburg
- Russia
| | - Alexander Moewes
- Department of Physics and Engineering Physics
- University of Saskatchewan
- Saskatoon
- Canada
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33
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McLeod JA, Pitman AL, Kurmaev EZ, Finkelstein LD, Zhidkov IS, Savva A, Moewes A. Linking the HOMO-LUMO gap to torsional disorder in P3HT/PCBM blends. J Chem Phys 2015; 143:224704. [DOI: 10.1063/1.4936898] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- John A. McLeod
- College of Nano Science and Technology, Soochow University, 199 Ren-Ai Rd., Suzhou, Jiangsu 215123, China
| | - Amy L. Pitman
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Ernst Z. Kurmaev
- Institute of Metal Physics, Russian Academy of Sciences–Ural Division, 620990 Yekaterinburg, Russia
| | - Larisa D. Finkelstein
- Institute of Metal Physics, Russian Academy of Sciences–Ural Division, 620990 Yekaterinburg, Russia
| | | | - Achilleas Savva
- Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Kitiou Kiprianou St. 45, 3603 Limassol, Cyprus
| | - Alexander Moewes
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
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34
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Bazylewski PF, Nguyen VL, Bauer RPC, Hunt AH, McDermott EJG, Leedahl BD, Kukharenko AI, Cholakh SO, Kurmaev EZ, Blaha P, Moewes A, Lee YH, Chang GS. Selective Area Band Engineering of Graphene using Cobalt-Mediated Oxidation. Sci Rep 2015; 5:15380. [PMID: 26486966 PMCID: PMC4614253 DOI: 10.1038/srep15380] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 09/23/2015] [Indexed: 11/09/2022] Open
Abstract
This study reports a scalable and economical method to open a band gap in single layer graphene by deposition of cobalt metal on its surface using physical vapor deposition in high vacuum. At low cobalt thickness, clusters form at impurity sites on the graphene without etching or damaging the graphene. When exposed to oxygen at room temperature, oxygen functional groups form in proportion to the cobalt thickness that modify the graphene band structure. Cobalt/Graphene resulting from this treatment can support a band gap of 0.30 eV, while remaining largely undamaged to preserve its structural and electrical properties. A mechanism of cobalt-mediated band opening is proposed as a two-step process starting with charge transfer from metal to graphene, followed by formation of oxides where cobalt has been deposited. Contributions from the formation of both CoO and oxygen functional groups on graphene affect the electronic structure to open a band gap. This study demonstrates that cobalt-mediated oxidation is a viable method to introduce a band gap into graphene at room temperature that could be applicable in electronics applications.
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Affiliation(s)
- Paul F Bazylewski
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
| | - Van Luan Nguyen
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon 440-746, Korea
| | - Robert P C Bauer
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
| | - Adrian H Hunt
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
| | - Eamon J G McDermott
- Institute Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/165-TC, A-1060 Vienna, Austria
| | - Brett D Leedahl
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
| | - Andrey I Kukharenko
- Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620990 Yekaterinburg, Russia.,Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia
| | - Seif O Cholakh
- Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia
| | - Ernst Z Kurmaev
- Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620990 Yekaterinburg, Russia.,Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia
| | - Peter Blaha
- Institute Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/165-TC, A-1060 Vienna, Austria
| | - Alexander Moewes
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
| | - Young Hee Lee
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon 440-746, Korea.,Department of Physics and Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Korea
| | - Gap Soo Chang
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
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35
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Green RJ, Regier TZ, Leedahl B, McLeod JA, Xu XH, Chang GS, Kurmaev EZ, Moewes A. Adjacent Fe-Vacancy Interactions as the Origin of Room Temperature Ferromagnetism in (In(1-x)Fe(x))2O3. Phys Rev Lett 2015; 115:167401. [PMID: 26550901 DOI: 10.1103/physrevlett.115.167401] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Indexed: 06/05/2023]
Abstract
Dilute magnetic semiconductors (DMSs) show great promise for applications in spin-based electronics, but in most cases continue to elude explanations of their magnetic behavior. Here, we combine quantitative x-ray spectroscopy and Anderson impurity model calculations to study ferromagnetic Fe-substituted In2O3 films, and we identify a subset of Fe atoms adjacent to oxygen vacancies in the crystal lattice which are responsible for the observed room temperature ferromagnetism. Using resonant inelastic x-ray scattering, we map out the near gap electronic structure and provide further support for this conclusion. Serving as a concrete verification of recent theoretical results and indirect experimental evidence, these results solidify the role of impurity-vacancy coupling in oxide-based DMSs.
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Affiliation(s)
- R J Green
- Department of Physics & Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - T Z Regier
- Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0X4, Canada
| | - B Leedahl
- Department of Physics & Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - J A McLeod
- Department of Physics & Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - X H Xu
- School of Chemistry & Materials Science, Shanxi Normal University, Linfen 041004, People's Republic of China
| | - G S Chang
- Department of Physics & Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - E Z Kurmaev
- M. N. Mikheev Institute of Metal Physics of the Ural Branch of Russian Academy of Sciences, 620990 Yekaterinburg, Russia
- Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
| | - A Moewes
- Department of Physics & Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
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36
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Endo K, Hyodo K, Takaoka K, Ida T, Shimada S, Takagi Y, Kurmaev EZ. Analysis of valence XPS and AES of C, N, O, and F-containing substances by DFT calculations using the model molecules. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2015.03.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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McLeod JA, Kurmaev EZ, Perez I, Green RJ, Xing LY, Wang XC, Jin CQ, Moewes A. Electronic structure and spin trapping in LiMnAs and LiFeAs:Mn. J Phys Condens Matter 2015; 27:015504. [PMID: 25478917 DOI: 10.1088/0953-8984/27/1/015504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The electronic structure of insulating antiferromagnetic LiMnAs is investigated using soft x-ray spectroscopy and compared to the electronic structure of metallic LiFeAs. Our calculations support the experimentally observed insulating antiferromagnetic order in LiMnAs. The x-ray absorption and resonant inelastic x-ray scattering spectra in LiFeAs and LiMnAs are adequately explained by the electronic structure alone, although it is possible that LiMnAs has significant electronic correlations driven by Hund's J coupling. Finally, we show evidence of a possible spin trap in Li(Fe0.95Mn0.05)As.
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Affiliation(s)
- J A McLeod
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
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Hunt A, Kurmaev EZ, Moewes A. A re-evaluation of how functional groups modify the electronic structure of graphene oxide. Adv Mater 2014; 26:4870-4874. [PMID: 24903059 DOI: 10.1002/adma.201401300] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Revised: 04/14/2014] [Indexed: 06/03/2023]
Abstract
The first 4 eV of the conduction band in graphene oxide is dominated by states from carbon sites that are in close proximity, but not directly bonded, to oxidizing functional groups. The carbon sites that are bonded directly to these groups, such as epoxide and hydroxyl groups, are much higher in energy.
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Affiliation(s)
- Adrian Hunt
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, S7N 5E2, Canada
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Kazek-Kęsik A, Dercz G, Kalemba I, Suchanek K, Kukharenko AI, Korotin DM, Michalska J, Krząkała A, Piotrowski J, Kurmaev EZ, Cholakh SO, Simka W. Surface characterisation of Ti–15Mo alloy modified by a PEO process in various suspensions. Materials Science and Engineering: C 2014; 39:259-72. [DOI: 10.1016/j.msec.2014.03.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 02/12/2014] [Accepted: 03/02/2014] [Indexed: 11/16/2022]
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Korotin MA, Pchelkina ZV, Skorikov NA, Kurmaev EZ, Anisimov VI. The coherent potential approximation for strongly correlated systems: electronic structure and magnetic properties of NiO-ZnO solid solutions. J Phys Condens Matter 2014; 26:115501. [PMID: 24589676 DOI: 10.1088/0953-8984/26/11/115501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A method of electronic structure calculations for strongly correlated disordered materials is developed employing the basic idea of the coherent potential approximation. The evolution of the electronic structure and spin magnetic moment value with the concentration x in strongly correlated Ni1-xZnxO solid solutions is investigated in the framework of this method. The values of the energy gap and magnetic moment obtained are in agreement with the available experimental data.
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Affiliation(s)
- M A Korotin
- Institute of Metal Physics, 620990, Ekaterinburg, Russia
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Simka W, Krząkała A, Korotin DM, Zhidkov IS, Kurmaev EZ, Cholakh SO, Kuna K, Dercz G, Michalska J, Suchanek K, Gorewoda T. Modification of a Ti–Mo alloy surface via plasma electrolytic oxidation in a solution containing calcium and phosphorus. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.02.102] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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42
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Korotin DM, Bartkowski S, Kurmaev EZ, Neumann M, Yakushina EB, Valiev RZ, Cholakh SO. Surface studies of coarse-grained and nanostructured titanium implants. J Nanosci Nanotechnol 2012; 12:8567-8572. [PMID: 23421245 DOI: 10.1166/jnn.2012.6806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The results of XPS measurements of nanostructured Ti (ns-Ti) prepared with a help of severe plastic deformation (SPD) have been presented. We have measured XPS spectra of core levels (Ti 2p, O 1s, C 1s, F 1s) and valence bands before and after treatment of ns-Ti-implants in HF. The obtained data have been compared with XPS measurements of untreated and acid treated coarse-grained Ti (cg-Ti). According to these measurements the surface composition has not practically been changed by reduction of grains size of Ti-implants. It has been found that the surface of both types of implants is covered with thick TiO2 layer. The acid treatment reduces the surface contamination of ns-Ti and cg-Ti by hydrocarbons and induces better passivation and formation of more thick TiO2 layer. It has been shown that severe plastic deformation not only improves mechanical properties but also preserves corrosion stability of Ti-implants.
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Affiliation(s)
- D M Korotin
- Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620990 Yekaterinburg, Russia
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43
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McLeod JA, Buling A, Green RJ, Boyko TD, Skorikov NA, Kurmaev EZ, Neumann M, Finkelstein LD, Ni N, Thaler A, Bud'ko SL, Canfield PC, Moewes A. Effect of 3d doping on the electronic structure of BaFe2As2. J Phys Condens Matter 2012; 24:215501. [PMID: 22534111 DOI: 10.1088/0953-8984/24/21/215501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The electronic structure of BaFe(2)As(2) doped with Co, Ni and Cu has been studied by a variety of experimental and theoretical methods, but a clear picture of the dopant 3d states has not yet emerged. Herein we provide experimental evidence of the distribution of Co, Ni and Cu 3d states in the valence band. We conclude that the Co and Ni 3d states provide additional free carriers to the Fermi level, while the Cu 3d states are found at the bottom of the valence band in a localized 3d(10) shell. These findings help shed light on why superconductivity can occur in BaFe(2)As(2) doped with Co and Ni but not Cu.
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Affiliation(s)
- J A McLeod
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, Canada.
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Zatsepin DA, Green RJ, Hunt A, Kurmaev EZ, Gavrilov NV, Moewes A. Structural ordering in a silica glass matrix under Mn ion implantation. J Phys Condens Matter 2012; 24:185402. [PMID: 22508933 DOI: 10.1088/0953-8984/24/18/185402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Mn(+)-implanted, amorphous SiO(2) samples were synthesized using pulsed-ion implantation without thermal annealing. The crystal and electronic structures have been studied using x-ray diffraction and synchrotron-based soft x-ray absorption and emission spectroscopy at the Si and Mn L(2,3) edges. We find a combination of small MnO clusters and Si crystallites at shallow depths while tetrahedral Mn coordination is found deeper in the host target. Through a combination of techniques, we find that the implantation process simultaneously decreases the long-range order in the near-surface region and increases order deeper in the SiO(2) host. Our results suggest Mn substitution into Si sites at deep levels catalyzes the formation of α-quartz, providing insight into the complex interactions that determine the local structure around the impurities as well as the overall changes to the crystallinity of implanted SiO(2).
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Affiliation(s)
- D A Zatsepin
- Department of Electrophysics, Ural Federal University, 19 Mira Street, Yekaterinburg 620002, Russia.
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McLeod JA, Kurmaev EZ, Sushko PV, Boyko TD, Levitsky IA, Moewes A. Selective Response of Mesoporous Silicon to Adsorbants with Nitro Groups. Chemistry 2012; 18:2912-22. [DOI: 10.1002/chem.201102084] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 11/11/2011] [Indexed: 11/05/2022]
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Korotin DM, Bartkowski S, Kurmaev EZ, Meumann M, Yakushina EB, Valiev RZ, Cholakh SO. Surface Characterization of Titanium Implants Treated in Hydrofluoric Acid. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/jbnb.2012.31011] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kurmaev EZ, McLeod JA, Skorikov NA, Finkelstein LD, Moewes A, Korotin MA, Izyumov YA, Xie YL, Wu G, Chen XH. Structural models of FeSe(x). J Phys Condens Matter 2009; 21:435702. [PMID: 21832444 DOI: 10.1088/0953-8984/21/43/435702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Two different structural models for non-stoichiometric FeSe(x) are examined and compared with soft x-ray spectroscopy findings for FeSe(x) (x = 0.85, 0.50). A structural model of tetragonal FeSe with excess interstitial Fe gives better agreement with experiment than a structural model of tetragonal FeSe with Se vacancies. This interstitial Fe increases the number of 3d states at the Fermi level. We find evidence that large non-stoichiometric ratios of Fe:Se, such as that of FeSe(0.50), yield clusters of pure Fe in the crystal structure.
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Affiliation(s)
- E Z Kurmaev
- Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620219 Yekaterinburg, Russia
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Kurmaev EZ, McLeod JA, Skorikov NA, Finkelstein LD, Moewes A, Izyumov YA, Clarke S. Identifying valence structure in LiFeAs and NaFeAs with core-level spectroscopy. J Phys Condens Matter 2009; 21:345701. [PMID: 21715787 DOI: 10.1088/0953-8984/21/34/345701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Resonant x-ray emission spectroscopy (XES) measurements at Fe L(2,3) edges and electronic structure calculations for LiFeAs and NaFeAs are presented. Experiment and theory show that in the vicinity of the Fermi energy, the density of states is dominated by contributions from Fe 3d states. The comparison of Fe L(2,3) XES with spectra of related FeAs compounds reveals similar trends in energy and the ratio of intensities of the L(2) and L(3) peaks (I(L(2))/I(L(3)) ratio). The I(L(2))/I(L(3)) ratio for all FeAs-based superconductors is found to be closer to that of metallic Fe than that of the strongly correlated FeO. We conclude that iron-based superconductors are weakly or, at most, moderately correlated systems.
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Affiliation(s)
- E Z Kurmaev
- Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620219 Yekaterinburg, Russia
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Chang GS, Kurmaev EZ, Boukhvalov DW, Finkelstein LD, Moewes A, Bieber H, Colis S, Dinia A. Co and Al co-doping for ferromagnetism in ZnO:Co diluted magnetic semiconductors. J Phys Condens Matter 2009; 21:056002. [PMID: 21817308 DOI: 10.1088/0953-8984/21/5/056002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Co and Al co-doped ZnO diluted magnetic semiconductors are fabricated by a pulsed laser deposition and their electronic structure is investigated using x-ray absorption and emission spectroscopy. The Zn(0.895)Co(0.100)Al(0.005)O thin films grown under oxygen-rich conditions exhibit ferromagnetic behavior without any indication of Co clustering. The Co L-edge and O K-edge x-ray absorption and emission spectra suggest that most of the Co dopants occupy the substitutional sites and the oxygen vacancies are not responsible for free charge carriers. The spectroscopic results and first principles calculations reveal that the ferromagnetism in Co and Al co-doped ZnO semiconductors mainly arises from Al interstitial defects and their hybridization with Co substitutional dopants.
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Affiliation(s)
- G S Chang
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada
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Chang GS, Kurmaev EZ, Finkelstein LD, Choi HK, Lee WO, Park YD, Pedersen TM, Moewes A. Post-annealing effect on the electronic structure of Mn atoms in Ga(₁-x)Mn(x)As probed by resonant inelastic x-ray scattering. J Phys Condens Matter 2007; 19:076215. [PMID: 22251602 DOI: 10.1088/0953-8984/19/7/076215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The electronic structure of as-grown and post-annealed Ga(₁-x)Mn(x)As epilayers (x≈0.055) has been investigated using resonant inelastic x-ray scattering. Mn L₂,₃ x-ray emission spectra show that the integral intensity ratio of Mn L₂ to L₃ emission lines increases with annealing temperature and comes close to that of manganese oxide. The oxygen K-emission/absorption spectra of post-annealed Ga₀.₉₄₅Mn₀.₀₅₅As show 1.5-3.0 times higher degree of oxidation on the film surface than that of the as-grown sample. These experimental findings are attributed to the diffusion of Mn impurity atoms from interstitial positions in the GaAs host lattice to the surface where they are passivated by oxygen.
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Affiliation(s)
- G S Chang
- Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, SK, S7N 5E2, Canada.
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