1
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Liu J, Lu R, Yu A. Origin of the low-energy tail in the photoluminescence spectrum of CsPbBr 3 nanoplatelets: a femtosecond transient absorption spectroscopic study. Phys Chem Chem Phys 2024; 26:12179-12187. [PMID: 38591257 DOI: 10.1039/d4cp00786g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
CsPbBr3 nanoplatelets (NPLs), as some of the two-dimensional lead halide perovskites, have been intensively investigated due to their outstanding photophysical and photoelectric properties. However, there remain unclear fundamental issues on their carrier kinetics and the low-energy tail in their photoluminescence (PL) spectrum. In this paper, we synthesized CsPbBr3 NPLs with five [PbBr6]4- monolayers and performed comprehensive studies by using steady-state absorption, PL, and femtosecond transient absorption (fs-TA) spectroscopic measurements. We determined both the biexciton Auger recombination time (7 ± 2 ps) and trapped exciton lifetime (110 ± 15 ps) of the five monolayer CsPbBr3 NPLs. We also investigated the origin of the low-energy tail emission in their PL spectrum. More importantly, we found that a negative ΔA feature in the energy range of 2.45-2.55 eV appears in their fs-TA spectrum at 2, 4 and 10 ps delay times, which could help them act as a laser gain medium. The low-energy tail emission in their PL spectrum overlaps well with the negative ΔA feature in the energy range of 2.45-2.55 eV in their fs-TA spectrum at 2, 4 and 10 ps delay times.
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Affiliation(s)
- Jinwei Liu
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China.
| | - Rong Lu
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China.
| | - Anchi Yu
- Department of Chemistry, Renmin University of China, Beijing 100872, People's Republic of China.
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2
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Armstrong ZT, Forlano KM, Roy CR, Bohlmann Kunz M, Farrell K, Pan D, Wright JC, Jin S, Zanni MT. Spatial Heterogeneity of Biexcitons in Two-Dimensional Ruddlesden-Popper Lead Iodide Perovskites. J Am Chem Soc 2023; 145:18568-18577. [PMID: 37565990 DOI: 10.1021/jacs.3c05533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
Quantum confinement in two-dimensional (2D) Ruddlesden-Popper (RP) perovskites leads to the formation of stable quasi-particles, including excitons and biexcitons, the latter of which may enable lasing in these materials. Due to their hybrid organic-inorganic structures and the solution phase synthesis, microcrystals of 2D RP perovskites can be quite heterogeneous, with variations in excitonic and biexcitonic properties between crystals from the same synthesis and even within individual crystals. Here, we employ one- and two-quantum two-dimensional white-light microscopy to systematically study the spatial variations of excitons and biexcitons in microcrystals of a series of 2D RP perovskites BA2MAn-1PbnI3n+1 (n = 2-4, BA= butylammonium, MA = methylammonium). We find that the average biexciton binding energy of around 60 meV is essentially independent of the perovskite layer thickness (n). We also resolve spatial variations of the exciton and biexciton energies on micron length scales within individual crystals. By comparing the one-quantum and two-quantum spectra at each pixel, we conclude that biexcitons are more sensitive to their environments than excitons. These results shed new light on the ways disorder can modify the energetic landscape of excitons and biexcitons in RP perovskites and how biexcitons can be used as a sensitive probe of the microscopic environment of a semiconductor.
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Affiliation(s)
- Zachary T Armstrong
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Kristel M Forlano
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Chris R Roy
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Miriam Bohlmann Kunz
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Kieran Farrell
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Dongxu Pan
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - John C Wright
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Song Jin
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Martin T Zanni
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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3
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Lou X, Yao L, Zhang J, Sui N, Wu M, Zhang W, Kang Z, Chi X, Zhou Q, Zhang H, Wang Y. Competition of Carrier Kinetics Contributes to Amplified Spontaneous Emission in Quasi-2D/3D (PBA) 2MA n-1Pb nBr 3n+1 Thin Films under Strip Light Mode. J Phys Chem Lett 2023; 14:4050-4057. [PMID: 37093818 DOI: 10.1021/acs.jpclett.3c00490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Quasi-2D halide perovskites have potential in lasing due to their amplified spontaneous emission (ASE) properties. The ASE of (PBA)2MAn-1PbnBr3n+1 thin films has been confirmed by photoluminescence (PL) testing using stripe light excitation (SLE). The ASE threshold decreases with decreasing environmental temperature (TE) or increasing number of inorganic layers (n). Using the transient absorption technique, the Auger recombination and the cooling process of the high-activity carrier are accelerated with the decrease of n or TE. A new ASE mechanism is proposed where high-activity carriers directly emit photons under photon perturbation from adjacent sites, leading to the accumulation and amplification of emitted photons only in the SLE region for ASE to occur. In addition, the reduction of n promotes light scattering between nano-thin layers, which supports a rapid increase in the ASE signal after the ASE threshold is crossed.
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Affiliation(s)
- Xue Lou
- Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China
| | - Lianfei Yao
- Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China
| | - Jiaqi Zhang
- Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130012, China
| | - Ning Sui
- Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China
| | - Min Wu
- Shandong Key Laboratory of Optical Communication Science and Technology, School of Physics Science and Information Technology, Liaocheng University, Liaocheng 252000, China
| | - Wei Zhang
- School of Physics and Materials Science, Guangzhou University, Guangzhou, 510006, China
- Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University, Guangzhou 510006, China
| | - Zhihui Kang
- Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China
| | - Xiaochun Chi
- Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China
| | - Qiang Zhou
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Hanzhuang Zhang
- Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China
| | - Yinghui Wang
- Femtosecond Laser Laboratory, Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, P. R. China
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4
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Carwithen BP, Hopper TR, Ge Z, Mondal N, Wang T, Mazlumian R, Zheng X, Krieg F, Montanarella F, Nedelcu G, Kroll M, Siguan MA, Frost JM, Leo K, Vaynzof Y, Bodnarchuk MI, Kovalenko MV, Bakulin AA. Confinement and Exciton Binding Energy Effects on Hot Carrier Cooling in Lead Halide Perovskite Nanomaterials. ACS NANO 2023; 17:6638-6648. [PMID: 36939330 PMCID: PMC10100565 DOI: 10.1021/acsnano.2c12373] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 03/13/2023] [Indexed: 06/18/2023]
Abstract
The relaxation of the above-gap ("hot") carriers in lead halide perovskites (LHPs) is important for applications in photovoltaics and offers insights into carrier-carrier and carrier-phonon interactions. However, the role of quantum confinement in the hot carrier dynamics of nanosystems is still disputed. Here, we devise a single approach, ultrafast pump-push-probe spectroscopy, to study carrier cooling in six different size-controlled LHP nanomaterials. In cuboidal nanocrystals, we observe only a weak size effect on the cooling dynamics. In contrast, two-dimensional systems show suppression of the hot phonon bottleneck effect common in bulk perovskites. The proposed kinetic model describes the intrinsic and density-dependent cooling times accurately in all studied perovskite systems using only carrier-carrier, carrier-phonon, and excitonic coupling constants. This highlights the impact of exciton formation on carrier cooling and promotes dimensional confinement as a tool for engineering carrier-phonon and carrier-carrier interactions in LHP optoelectronic materials.
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Affiliation(s)
- Ben P. Carwithen
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
| | - Thomas R. Hopper
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
- Department
of Materials Science and Engineering, Stanford
University, Stanford, California 94305, United States
| | - Ziyuan Ge
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
| | - Navendu Mondal
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
| | - Tong Wang
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
| | - Rozana Mazlumian
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
| | - Xijia Zheng
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
| | - Franziska Krieg
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa−Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Federico Montanarella
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa−Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Georgian Nedelcu
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa−Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, Groningen 9747AG, The Netherlands
| | - Martin Kroll
- Center
for
Advancing Electronics Dresden, Technische
Universität Dresden, 01069 Dresden, Germany
- Integrated
Center for Applied Photophysics and Photonic Materials, Technische Universität Dresden, 01187 Dresden, Germany
| | - Miguel Albaladejo Siguan
- Chair
for Emerging Electronic Technologies, Technische
Universität Dresden, 01187 Dresden, Germany
- Leibniz
Institute for Solid State and Materials Research Dresden, Technische Universität Dresden, 01069 Dresden, Germany
| | - Jarvist M. Frost
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
| | - Karl Leo
- Integrated
Center for Applied Photophysics and Photonic Materials, Technische Universität Dresden, 01187 Dresden, Germany
| | - Yana Vaynzof
- Chair
for Emerging Electronic Technologies, Technische
Universität Dresden, 01187 Dresden, Germany
- Leibniz
Institute for Solid State and Materials Research Dresden, Technische Universität Dresden, 01069 Dresden, Germany
| | - Maryna I. Bodnarchuk
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa−Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Maksym V. Kovalenko
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa−Swiss
Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Artem A. Bakulin
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United
Kingdom
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5
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Kaur G, Shukla A, Babu KJ, Ghosh HN. Chemically Engineered Avenues: Opportunities for Attaining Desired Carrier Cooling in Perovskites. CHEM REC 2022; 22:e202200106. [PMID: 35882519 DOI: 10.1002/tcr.202200106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 06/29/2022] [Accepted: 07/07/2022] [Indexed: 11/11/2022]
Abstract
Hot carrier extraction-based devices are presently being persuaded as the most revolutionary means of surpassing the theoretical thermodynamic conversion efficiency limit (∼67 % for a model hot carrier solar cell). However, for practical realisation, there stand various hurdles that need to be surmounted, a major among all being the rapid hot carrier cooling rate. Though, the perovskite family has already demonstrated itself to exhibit slower cooling in contrast to the prototypical semiconductors. Decelerating this entire process of cooling further can prove to be a crucial stride in this regard. Quite contrarily, for the optoelectronic applications the situation is entirely conflicting where quick rate of cooling is a chief prerequisite. In the recent times, there have been various key developments that have targeted altering this cooling rate by various chemically engineered strategies. This review highlights such blueprints that can be utilized towards the advantageous alteration of the carrier cooling in accordance with the device requirements.
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Affiliation(s)
- Gurpreet Kaur
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India
| | - Ayushi Shukla
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India
| | - K Justice Babu
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Mohali, Punjab, 160062, India.,RPC Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 40085, India
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6
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Rahman A, Goswami T, Tyagi N, Ghosh HN, Neelakandan PP. Hot Electron Migration from Gold Nanoparticle to an Organic Molecule Enhances Luminescence and Photosensitization Properties of a pH Activatable Plasmon-Molecule Coupled Nanocomposite. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Otero-Martínez C, Ye J, Sung J, Pastoriza-Santos I, Pérez-Juste J, Xia Z, Rao A, Hoye RLZ, Polavarapu L. Colloidal Metal-Halide Perovskite Nanoplatelets: Thickness-Controlled Synthesis, Properties, and Application in Light-Emitting Diodes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107105. [PMID: 34775643 DOI: 10.1002/adma.202107105] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 11/09/2021] [Indexed: 05/20/2023]
Abstract
Colloidal metal-halide perovskite nanocrystals (MHP NCs) are gaining significant attention for a wide range of optoelectronics applications owing to their exciting properties, such as defect tolerance, near-unity photoluminescence quantum yield, and tunable emission across the entire visible wavelength range. Although the optical properties of MHP NCs are easily tunable through their halide composition, they suffer from light-induced halide phase segregation that limits their use in devices. However, MHPs can be synthesized in the form of colloidal nanoplatelets (NPls) with monolayer (ML)-level thickness control, exhibiting strong quantum confinement effects, and thus enabling tunable emission across the entire visible wavelength range by controlling the thickness of bromide or iodide-based lead-halide perovskite NPls. In addition, the NPls exhibit narrow emission peaks, have high exciton binding energies, and a higher fraction of radiative recombination compared to their bulk counterparts, making them ideal candidates for applications in light-emitting diodes (LEDs). This review discusses the state-of-the-art in colloidal MHP NPls: synthetic routes, thickness-controlled synthesis of both organic-inorganic hybrid and all-inorganic MHP NPls, their linear and nonlinear optical properties (including charge-carrier dynamics), and their performance in LEDs. Furthermore, the challenges associated with their thickness-controlled synthesis, environmental and thermal stability, and their application in making efficient LEDs are discussed.
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Affiliation(s)
- Clara Otero-Martínez
- CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Department of Physical Chemistry, Campus Universitario Lagoas, Marcosende, Vigo, 36310, Spain
- CINBIO, Universidade de Vigo, Deparment of Physical Chemistry, Campus Universitario Lagoas, Marcosende, Vigo, 36310, Spain
- Galicia Sur Health Research Institute (IIS Galicia Sur). SERGAS-UVIGO, Vigo, 36310, Spain
| | - Junzhi Ye
- Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Jooyoung Sung
- Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge, CB3 0HE, UK
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
| | - Isabel Pastoriza-Santos
- CINBIO, Universidade de Vigo, Deparment of Physical Chemistry, Campus Universitario Lagoas, Marcosende, Vigo, 36310, Spain
- Galicia Sur Health Research Institute (IIS Galicia Sur). SERGAS-UVIGO, Vigo, 36310, Spain
| | - Jorge Pérez-Juste
- CINBIO, Universidade de Vigo, Deparment of Physical Chemistry, Campus Universitario Lagoas, Marcosende, Vigo, 36310, Spain
- Galicia Sur Health Research Institute (IIS Galicia Sur). SERGAS-UVIGO, Vigo, 36310, Spain
| | - Zhiguo Xia
- School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, Guangdong, 510641, P. R. China
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Robert L Z Hoye
- Department of Materials, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Lakshminarayana Polavarapu
- CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Department of Physical Chemistry, Campus Universitario Lagoas, Marcosende, Vigo, 36310, Spain
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8
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Shukla A, Kaur G, Babu KJ, Kaur A, Yadav DK, Ghosh HN. Defect-Interceded Cascading Energy Transfer and Underlying Charge Transfer in Europium-Doped CsPbCl 3 Nanocrystals. J Phys Chem Lett 2022; 13:83-90. [PMID: 34958589 DOI: 10.1021/acs.jpclett.1c03661] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Rare-earth ion (RE3+) doping in cesium lead chloride (CsPbCl3) has unlocked novel prospects to explore changes in optical, magnetic, and charge carrier transport properties. This leads to a huge advancement in optoelectronic applications, yet deep understanding of the photophysics governing the energy transfer processes is lacking and demands vital attention. Herein, we probe into the mechanistic transfer processes from the band edge of the host (CsPbCl3) to the dopant europium ion (Eu3+) with the aid of femtosecond fluorescence upconversion and transient absorption (TA) spectroscopy. The upconversion measurement portrays a defect-mediated cascading energy transfer from CsPbCl3 to Eu3+ and further cross-relaxation among Eu3+ states. Moreover, TA studies reveal that there is charge transfer from the band edge of CsPbCl3 to doping-induced shallow defect states. Furthermore, two-photon absorption study establishes no compromise in the transfer mechanism even upon bandgap excitation. This work validates that Eu-CsPbCl3 is an apt entrant for optoelectronic applications.
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Affiliation(s)
- Ayushi Shukla
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali 140306, Punjab, India
| | - Gurpreet Kaur
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali 140306, Punjab, India
| | | | - Arshdeep Kaur
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali 140306, Punjab, India
| | - Dharmendra Kumar Yadav
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali 140306, Punjab, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali 140306, Punjab, India
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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9
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Bhatt H, Goswami T, Yadav DK, Ghorai N, Shukla A, Kaur G, Kaur A, Ghosh HN. Ultrafast Hot Electron Transfer and Trap-State Mediated Charge Carrier Separation toward Enhanced Photocatalytic Activity in g-C 3N 4/ZnIn 2S 4 Heterostructure. J Phys Chem Lett 2021; 12:11865-11872. [PMID: 34874742 DOI: 10.1021/acs.jpclett.1c03356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Comprehensive understanding of charge carrier dynamics in the heterostructure based photocatalytic materials will strengthen their candidature as future solar energy harvesting resources. Here, in this work, the g-C3N4(CN)/ZnIn2S4 (ZIS) heterostructure was successfully synthesized and a direct spectroscopic correlation was established between excited-state charge carrier dynamics and enhanced photocatalytic activity using ultrafast transient absorption (TA) spectroscopy. TA analysis demonstrated the dominance of hot electron transfer over the band edge one. The photogenerated hot electrons migrated from the high-energy excitonic states of CN toward ZIS in the subpicosecond time scale. Broad-band (UV to NIR) ultrafast transient pump-probe spectroscopy revealed the collective effect of hot electron transfer as well as trap-state mediated electron delocalization in the enhanced photocatalytic H2 evolution. This work reveals the role of photogenerated carriers in the photocatalytic performance of the CN/ZIS heterostructure and would create a new avenue toward the advancement of CN based heterostructure in photocatalytic devices.
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Affiliation(s)
- Himanshu Bhatt
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
| | - Tanmay Goswami
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
| | - Dharmendra Kumar Yadav
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
| | - Nandan Ghorai
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
| | - Ayushi Shukla
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
| | - Gurpreet Kaur
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
| | - Arshdeep Kaur
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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10
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Kaur A, Goswami T, Rondiya SR, Jadhav YA, Babu KJ, Shukla A, Yadav DK, Ghosh HN. Enhanced Charge Carrier Separation and Improved Biexciton Yield at the p-n Junction of SnSe/CdSe Heterostructures: A Detailed Electrochemical and Ultrafast Spectroscopic Investigation. J Phys Chem Lett 2021; 12:10958-10968. [PMID: 34738822 DOI: 10.1021/acs.jpclett.1c02946] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Tin chalcogenides (SnX, X = S, Se)-based heterostructures (HSs) are promising materials for the construction of low-cost optoelectronic devices. Here, we report the synthesis of a SnSe/CdSe HS using the controlled cation exchange reaction. The (400) plane of SnSe and the (111) plane of CdSe confirm the formation of an interface between SnSe and CdSe. The Type I band alignment is estimated for the SnSe/CdSe HS with a small conduction band offset (CBO) of 0.72 eV through cyclic voltammetry measurements. Transient absorption (TA) studies demonstrate a drastic enhancement of the CdSe biexciton signal that points toward the hot carrier transfer from SnSe to CdSe in a short time scale. The fast growth and recovery of CdSe bleach in the presence of SnSe indicate charge transfer back to SnSe. The observed delocalization of carriers in these two systems is crucial for an optoelectronic device. Our findings provide new insights into the fabrication of cost-effective photovoltaic devices based on SnSe-based heterostructures.
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Affiliation(s)
- Arshdeep Kaur
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali, Punjab140306, India
| | - Tanmay Goswami
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali, Punjab140306, India
| | - Sachin R Rondiya
- School of Energy Studies, Savitribai Phule Pune University, Pune411007, India
| | - Yogesh A Jadhav
- School of Energy Studies, Savitribai Phule Pune University, Pune411007, India
| | - K Justice Babu
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali, Punjab140306, India
| | - Ayushi Shukla
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali, Punjab140306, India
| | - Dharmendra Kumar Yadav
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali, Punjab140306, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, SAS Nagar, Sector 81, Mohali, Punjab140306, India
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai400085, India
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11
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Liu F, Qu F, Žutić I, Xie S, Liu D, Fonseca ALA, Malard M. Robust Topological Nodal-Line Semimetals from Periodic Vacancies in Two-Dimensional Materials. J Phys Chem Lett 2021; 12:5710-5715. [PMID: 34128659 DOI: 10.1021/acs.jpclett.1c01249] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A nodal-line semimetal (NLSM) is suppressed in the presence of spin-orbit coupling unless it is protected by a nonsymmorphic symmetry. We show that two-dimensional (2D) materials can realize robust NLSMs when vacancies are introduced on the lattice. As a case study we investigate borophene, a boron honeycomb-like sheet. While the Dirac cones of pristine borophene are shown to be gapped out by spin-orbit coupling and by magnetic exchange, robust nodal lines (NLs) emerge in the spectrum when selected atoms are removed. We propose an effective 2D model and a symmetry analysis to demonstrate that these NLs are topological and protected by a nonsymmorphic glide plane. Our findings offer a paradigm shift to the design of NLSMs: instead of searching for nonsymmorphic materials, robust NLSMs may be realized simply by removing atoms from ordinary symmorphic crystals.
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Affiliation(s)
- F Liu
- Instituto de Física, Universidade de Brasília, Brasília-DF, Brazil
| | - F Qu
- Instituto de Física, Universidade de Brasília, Brasília-DF, Brazil
| | - I Žutić
- Department of Physics, University at Buffalo, the State University of New York, Buffalo, New York 14260, United States
| | - S Xie
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, China
| | - D Liu
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, China
| | - A L A Fonseca
- Instituto de Física, Universidade de Brasília, Brasília-DF, Brazil
| | - M Malard
- Faculdade UnB Planaltina, Universidade de Brasília, Brasília-DF, Brazil
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12
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Justice Babu K, Kaur G, Shukla A, Kaur A, Goswami T, Ghorai N, Ghosh HN. Concurrent Energy- and Electron-Transfer Dynamics in Photoexcited Mn-Doped CsPbBr 3 Perovskite Nanoplatelet Architecture. J Phys Chem Lett 2021; 12:302-309. [PMID: 33350833 DOI: 10.1021/acs.jpclett.0c03267] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Mn-doped perovskites have already been widely explored in the context of interesting optical, electronic, and magnetic properties. Such fascinating traits showcased by them explain the huge augmentation in the device efficiency, directing their widespread application in the field of solar cells, energy- harvesting sectors, and light-emitting diodes. However, the underlying photophysics governing the overall charge carrier dynamics in Mn-doped CsPbBr3 nanoplatelets (NPLs) has never been discussed and therefore demands an in-depth investigation. Herein, fluorescence up-conversion and femtosecond transient absorption (TA) spectroscopy are employed for gaining a comprehensive understanding of the excited-state dynamics and the fundamental energy/charge-transfer processes for two-dimensional CsPbBr3 nanoplatelets (NPLs) and their Mn-doped counterparts. The up-conversion measurement clearly suggests the possibility of energy-transfer pathways in the Mn-doped CsPbBr3 NPLs. Interestingly, strong indication of charge transfer (CT) in Mn-doped CsPbBr3 NPLs was unambiguously established by an ultrafast TA approach. Our investigation clearly suggests that both the probable processes viz. the ultrafast energy and electron transfers noticeable in the Mn2+-doped CsPbBr3 NPLs are utterly competitive and rapid owing to the highly confined nature of the two-dimensional NPLs. This extensive probing of concurrent charge/energy-transfer processes may pave help clarify unresolved anomalies in Mn-doped perovskites, which may prove advantageous for a wide range of practical applicability.
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Affiliation(s)
| | - Gurpreet Kaur
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Ayushi Shukla
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Arshdeep Kaur
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Tanmay Goswami
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Nandan Ghorai
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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13
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Fattal H, Creason TD, Delzer CJ, Yangui A, Hayward JP, Ross BJ, Du MH, Glatzhofer DT, Saparov B. Zero-Dimensional Hybrid Organic-Inorganic Indium Bromide with Blue Emission. Inorg Chem 2021; 60:1045-1054. [PMID: 33397099 DOI: 10.1021/acs.inorgchem.0c03164] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Low-dimensional hybrid organic-inorganic metal halides have received increased attention because of their outstanding optical and electronic properties. However, the most studied hybrid compounds contain lead and have long-term stability issues, which must be addressed for their use in practical applications. Here, we report a new zero-dimensional hybrid organic-inorganic halide, RInBr4, featuring photoemissive trimethyl(4-stilbenyl)methylammonium (R+) cations and nonemissive InBr4- tetrahedral anions. The crystal structure of RInBr4 is composed of alternating layers of inorganic anions and organic cations along the crystallographic a axis. The resultant hybrid demonstrates bright-blue emission with Commission Internationale de l'Eclairage color coordinates of (0.19, 0.20) and a high photoluminescence quantum yield (PLQY) of 16.36% at room temperature, a 2-fold increase compared to the PLQY of 8.15% measured for the precursor organic salt RBr. On the basis of our optical spectroscopy and computational work, the organic component is responsible for the observed blue emission of the hybrid material. In addition to the enhanced light emission efficiency, the novel hybrid indium bromide demonstrates significantly improved environmental stability. These findings may pave the way for the consideration of hybrid organic In(III) halides for light emission applications.
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Affiliation(s)
- Hadiah Fattal
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Tielyr D Creason
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Cordell J Delzer
- Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Aymen Yangui
- Chemical Physics and NanoLund, Lund University, P.O. Box 124, Lund 22100, Sweden
| | - Jason P Hayward
- Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Bradley J Ross
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Mao-Hua Du
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Daniel T Glatzhofer
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
| | - Bayrammurad Saparov
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
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14
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Kumar PPP, Rahman A, Goswami T, Ghosh HN, Neelakandan PP. Fine-Tuning Plasmon-Molecule Interactions in Gold-BODIPY Nanocomposites: The Role of Chemical Structure and Noncovalent Interactions. Chempluschem 2020; 86:87-94. [PMID: 33058562 DOI: 10.1002/cplu.202000545] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 09/28/2020] [Indexed: 01/06/2023]
Abstract
Strong coupling between localized surface plasmons and molecular absorptions leads to remarkable changes in the photophysical properties of dye-loaded metal nanoparticles. Here, we report supramolecular nanocomposites consisting of BODIPY, tryptophan, and gold nanoparticles, and investigate the effect of structural variations on their photophysical properties. Our results indicate that the photostability and photosensitization properties of the nanocomposites depend on the chemical composition of the BODIPY molecules. The singlet oxygen quantum yield of the nanocomposites NC1 (BODIPY, B1 bearing a single methyl group) and NC3 (BODIPY, B3 with 5 methyl and 2 iodo groups) were 0.46 and 0.42, respectively, which were significantly higher compared to their individual components. Ultrafast spectroscopy studies revealed that the migration of photoexcited BODIPY electrons to the plasmonic photoexcitation allowed electron transfer into the singlet oxygen states, thereby leading to efficient generation of singlet oxygen.
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Affiliation(s)
- P P Praveen Kumar
- Institute of Nano Science and Technology, Habitat Centre, Phase 10, Sector 64, Mohali, 160062, India
| | - Atikur Rahman
- Institute of Nano Science and Technology, Habitat Centre, Phase 10, Sector 64, Mohali, 160062, India
| | - Tanmay Goswami
- Institute of Nano Science and Technology, Habitat Centre, Phase 10, Sector 64, Mohali, 160062, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Habitat Centre, Phase 10, Sector 64, Mohali, 160062, India.,Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Prakash P Neelakandan
- Institute of Nano Science and Technology, Habitat Centre, Phase 10, Sector 64, Mohali, 160062, India
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15
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Kaur G, Ghosh HN. Hot Carrier Relaxation in CsPbBr 3-Based Perovskites: A Polaron Perspective. J Phys Chem Lett 2020; 11:8765-8776. [PMID: 32961059 DOI: 10.1021/acs.jpclett.0c02339] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Long-standing interpretations for the exceptional photovoltaic and optoelectronic properties showcased by the perovskite family pertain to the underlying complicated interplay of polaron formation and hot carrier cooling. This Perspective primarily focuses on reassessing the existing status of polaron studies conducted on CsPbBr3-based systems in particular, in the framework of transient absorption investigations. The role of the key aspect that is ultimately accountable for deciding the fate of polaron formation, i.e., the carrier-longitudinal optical phonon coupling, has been comprehensively evaluated in terms of diverse factors which affect this Fröhlich interaction-mediated coupling. The study provides a detailed discussion regarding the alterations in lattice polarity, surrounding dielectric medium, lattice temperature, and system dimensionality which can influence the charge screening extent and thereby the polaron formation. Such studies concerning strategies for achieving easily attainable modulations in polaron formation in CsPbBr3-based systems are highly relevant for technological advancement.
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Affiliation(s)
- Gurpreet Kaur
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
| | - Hirendra N Ghosh
- Institute of Nano Science and Technology, Mohali, Punjab 160062, India
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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