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Physicochemical characterizations and semiconducting properties of a manganese tungstate MnWO4 obtained by hydrothermal route. J Solid State Electrochem 2021. [DOI: 10.1007/s10008-021-04977-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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2
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Buizza LV, Wright AD, Longo G, Sansom HC, Xia CQ, Rosseinsky MJ, Johnston MB, Snaith HJ, Herz LM. Charge-Carrier Mobility and Localization in Semiconducting Cu 2AgBiI 6 for Photovoltaic Applications. ACS ENERGY LETTERS 2021; 6:1729-1739. [PMID: 34056108 PMCID: PMC8155390 DOI: 10.1021/acsenergylett.1c00458] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 03/31/2021] [Indexed: 05/26/2023]
Abstract
Lead-free silver-bismuth semiconductors have become increasingly popular materials for optoelectronic applications, building upon the success of lead halide perovskites. In these materials, charge-lattice couplings fundamentally determine charge transport, critically affecting device performance. In this study, we investigate the optoelectronic properties of the recently discovered lead-free semiconductor Cu2AgBiI6 using temperature-dependent photoluminescence, absorption, and optical-pump terahertz-probe spectroscopy. We report ultrafast charge-carrier localization effects, evident from sharp THz photoconductivity decays occurring within a few picoseconds after excitation and a rise in intensity with decreasing temperature of long-lived, highly Stokes-shifted photoluminescence. We conclude that charge carriers in Cu2AgBiI6 are subject to strong charge-lattice coupling. However, such small polarons still exhibit mobilities in excess of 1 cm2 V-1 s-1 at room temperature because of low energetic barriers to formation and transport. Together with a low exciton binding energy of ∼29 meV and a direct band gap near 2.1 eV, these findings highlight Cu2AgBiI6 as an attractive lead-free material for photovoltaic applications.
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Affiliation(s)
- Leonardo
R. V. Buizza
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
| | - Adam D. Wright
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
| | - Giulia Longo
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
- Department
of Mathematics, Physics and Electrical Engineering, University of Northumbria, Ellison Place, Newcastle-Upon-Tyne, NE1 8ST, United Kingdom
| | - Harry C. Sansom
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
| | - Chelsea Q. Xia
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
| | - Matthew J. Rosseinsky
- Department
of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, United
Kingdom
| | - Michael B. Johnston
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
| | - Henry J. Snaith
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
| | - Laura M. Herz
- Department
of Physics, University of Oxford, Clarendon
Laboratory, Parks Road, Oxford, OX1
3PU, United Kingdom
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Chupakhina Т, Melnikova N, Kadyrova N, Deeva Y, Mirzorakhimov А, Gavrilova T, Gilmutdinov I, Eremina R. Synthesis, structure, magnetic behavior and dielectric relaxation of the LaxSr2-xFeхTi1-хO4 (х = 0.5, 0.7) oxide ceramic. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121687] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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4
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Singh P, Alam M, Kumar S, Anand K, Gangwar VK, Ghosh S, Sawada M, Shimada K, Singh RK, Ghosh AK, Chatterjee S. Roles of Re-entrant cluster glass state and spin-lattice coupling in magneto-dielectric behavior of giant dielectric double perovskite La 1.8Pr 0.2CoFeO 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:445801. [PMID: 32688353 DOI: 10.1088/1361-648x/aba778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
La based Co-Fe combined double perovskite (La1.8Pr0.2CoFeO6) was synthesized and the dielectric (zero-field and in-field), magnetic, x-ray absorption and Raman spectroscopy measurements have been investigated for La1.8Pr0.2CoFeO6double perovskite. The existence of re-entrant cluster glass state is observed. The magneto-dielectric (MD) is found in two temperature regions (25-80 K and 125-275 K). It has been demonstrated that the observed MD at low and high temperatures are respectively due to the spin freezing and the spin-lattice coupling. Furthermore, the very large dielectric constant and the low loss suggest that La1.8Pr0.2CoFeO6is very important from the application point of view.
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Affiliation(s)
- Prajyoti Singh
- Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
| | - Mohd Alam
- Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
| | - Shiv Kumar
- Hiroshima Synchrotron Radiation Centre, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | - Khyati Anand
- Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
| | - Vinod K Gangwar
- Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
| | - Surajit Ghosh
- Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
| | - M Sawada
- Hiroshima Synchrotron Radiation Centre, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | - K Shimada
- Hiroshima Synchrotron Radiation Centre, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
| | - R K Singh
- Department of Physics, Banaras Hindu University, Varanasi-221005, India
| | - A K Ghosh
- Department of Physics, Banaras Hindu University, Varanasi-221005, India
| | - Sandip Chatterjee
- Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
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5
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Shu GJ, Wu PC, Chou FC. The spin–orbit–phonon coupling and crystalline elasticity of LaCoO 3 perovskite. RSC Adv 2020; 10:43117-43128. [PMID: 35514908 PMCID: PMC9058157 DOI: 10.1039/d0ra09675j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 11/21/2020] [Indexed: 12/02/2022] Open
Abstract
Based on an integrated study of magnetic susceptibility, specific heat, and thermal expansion of single-crystal LaCoO3 free from cobalt and oxygen vacancies, two narrow spin gaps are identified before and after the phonon softening of gap size ΔE ∼ 0.5 meV in a CoO6-octahedral crystal electric field (CEF) and the thermally activated spin gap Q ∼ 25 meV, respectively. Significant excitation of Co3+ spins from a low-spin (LS) to a high-spin (HS) state is confirmed by the thermal activation behavior of spin susceptibility χS of energy gap Q ∼ 25 meV, which follows a two-level Boltzmann distribution to saturate at a level of 50% LS/50% HS statistically above ∼200 K, without the inclusion of a postulated intermediate spin (IS) state. A threefold increase in the thermal expansion; coefficient (α) across the same temperature range as that of thermally activated HS population growth is identified, which implies the non-trivial spin–orbit–phonon coupling caused the bond length of Co3+(LS↔HS)–O fluctuation and the local lattice distortion. The unusually narrow gap of ΔE ∼ 0.5 meV for the CoO6 octahedral CEF between eg–t2g indicates a more isotropic negative charge distribution within the octahedral CEF environment, which is verified by the Electron Energy Loss Spectroscopy (EELS) study to show nontrivial La–O covalency. Considering the before and after phonon softening, the gap in a CoO6-octahedral crystal electric fields (CEF) and the thermally activated spin gap, were observed of ∼0.5 meV and Q ∼ 25 meV in defect-free LaCoO3 single crystal, respectively.![]()
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Affiliation(s)
- Guo-Jiun Shu
- Department of Materials and Mineral Resources Engineering
- National Taipei University of Technology
- Taipei 10608
- Taiwan
- Institute of Mineral Resources Engineering
| | - Pei-Chieh Wu
- Institute of Mineral Resources Engineering
- National Taipei University of Technology
- Taipei 10608
- Taiwan
| | - F. C. Chou
- Center for Condensed Matter Science
- National Taiwan University
- Taipei 10617
- Taiwan
- National Synchrotron Radiation Research Center
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Tiwari S, Vitta S. Magnetoelectric and magnetodielectric coupling and microwave resonator characteristics of Ba 0.5Sr 0.5Nb 2O 6/CoCr 0.4Fe 1.6O 4 multiferroic composite. Sci Rep 2018; 8:11619. [PMID: 30072713 PMCID: PMC6072765 DOI: 10.1038/s41598-018-30132-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 07/20/2018] [Indexed: 11/09/2022] Open
Abstract
A multiferroic composite consisting of single phases of 30 vol.% magnetostrictive ferrite and 70 vol.% relaxor ferroelectric has been synthesized. The ferrite exhibits a diffuse dielectric phase transition (DPT)with the transition temperature varying from 450 K to 600 K and an activation energy of 0.29 eV. Magnetically, it has a soft behavior with 70 emug-1 saturation magnetization and a Curie transition at ~620 K. The relaxor ferroelectric phase on the other hand exhibits two clear DPTs at 390 K-400 K and 150 K-300 K. The composite of these two shows a soft ferromagnetic behavior reminiscent of the ferrite along with 3 DPTs. There is strong coupling between the two orders - magnetostrictive and piezoelectric in the composite. The capacitance decreases by 45% in the presence of magnetic field corresponding to a sensitivity of 0.9% kOe-1, an extremely large value. The magnetoelectric coupling constant is found to be 20.6 mVcm-1Oe-1, a large value for a bulk composite. Microwave band stop filters of different thicknesses made from the composite have resonant frequencies which upshift in the presence of magnetic field indicating a multiferroic behavior with possibility for electric field tuning of resonant frequency.
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Affiliation(s)
- Shivangi Tiwari
- Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Satish Vitta
- Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, 400076, India.
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Effects of temperature on conduction mechanism, ac electrical and dielectric properties of NdFe0.9Ni0.1O3 by employing impedance spectroscopy. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3654-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Zhu M, Zhang N, Wang H, Li YD, Huang SG, Li QJ, Yu Y, Guo Y, Liu XL, Wang CC. Point-defect-induced colossal dielectric behavior in GaAs single crystals. RSC Adv 2017. [DOI: 10.1039/c7ra00058h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We herein reported colossal dielectric constant (CDC) behavior in GaAs single crystals.
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Zou Q, Liu M, Wang GQ, Lu HL, Yang TZ, Guo HM, Ma CR, Xu X, Zhang MH, Jiang JC, Meletis EI, Lin Y, Gao HJ, Chen CL. Step terrace tuned anisotropic transport properties of highly epitaxial LaBaCo2O5.5+δ thin films on vicinal SrTiO3 substrates. ACS APPLIED MATERIALS & INTERFACES 2014; 6:6704-6708. [PMID: 24716582 DOI: 10.1021/am500422j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Highly epitaxial LaBaCo2O5.5+δ (LBCO) thin films were grown on different miscut (001) SrTiO3 substrates (miscut angle of 0.5°, 3.0°, and 5.0°) to study the substrate surface step terrace effect on the in-plane electrical transport properties. The microstructure studies by X-ray diffraction and transmission electron microscopy indicate that the as-grown films are A-site disordered cubic perovskite structures with the c-axis highly oriented along the film growth direction. The four-probe scanning tunneling microscopy (STM) studies show that the LBCO thin films grown on the vicinal SrTiO3 substrates have a typical semiconductor behavior with the substrate surface terrace step inducing anisotropic electronic transport properties. These results indicate that in highly epitaxial thin films the surface terrace step induced local strains can play an important role in controlling the electronic transport properties and the anisotropic nature.
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Affiliation(s)
- Q Zou
- Institute of Physics, Chinese Academy of Sciences , Beijing 100080, China
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Øygarden V, Lein HL, Grande T. Structure, thermal expansion and electrical conductivity of Nb-substituted LaCoO3. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.04.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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12
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Affiliation(s)
- E. Iguchi
- a Materials Science, Department of Mechanical Engineering and Materials Science, Faculty of Engineering , Yokohama National University , Tokiwadai, Hodogaya-Ku, Yokohama , 240-8501 , Japan
| | - N. Nakamura
- a Materials Science, Department of Mechanical Engineering and Materials Science, Faculty of Engineering , Yokohama National University , Tokiwadai, Hodogaya-Ku, Yokohama , 240-8501 , Japan
| | - A. Aoki
- a Materials Science, Department of Mechanical Engineering and Materials Science, Faculty of Engineering , Yokohama National University , Tokiwadai, Hodogaya-Ku, Yokohama , 240-8501 , Japan
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Dynamic t–Tdyn–Tg diagram analysis of thermal isomerization of polyisoimide using complex electric modulus properties. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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