Article (Scientific journals)
Coevaporation Stabilizes Tin-Based Perovskites in a Single Sn-Oxidation State
Singh, Ajay; Hieulle, Jeremy; Ferreira Machado, Joana Andreia et al.
2022In Nano Letters
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Keywords :
Perovskite solar cell; PVD; Photoluminescence
Abstract :
[en] Chemically processed methylammonium tin-triiodide (CH3NH3SnI3) films include Sn in different oxidation states, leading to poor stability and low power conversion efficiency of the resulting solar cells (PSCs). The development of absorbers with Sn [2+] only has been identified as one of the critical steps to develop all Sn-based devices. Here, we report on coevaporation of CH3NH3I and SnI2 to obtain absorbers with Sn being only in the preferred oxidation state [+2] as confirmed by X-ray photoelectron spectroscopy. The Sn [4+]-free absorbers exhibit smooth highly crystalline surfaces and photoluminescence measurements corroborating their excellent optoelectronic properties. The films show very good stability under heat and light. Photoluminescence quantum yields up to 4 × 10^-3 translate in a quasi Fermi-level splittings exceeding 850 meV under one sun equivalent conditions showing high promise in developing lead-free, high efficiency, and stable PSCs.
Disciplines :
Physics
Author, co-author :
Singh, Ajay ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Hieulle, Jeremy  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Ferreira Machado, Joana Andreia ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Gharabeiki, Sevan ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Zuo, Weiwei;  Institute for Photovoltaics (IPV), University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany
Farooq, Muhammad Uzair ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Phirke, Himanshu ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Saliba, Michael;  Institute for Photovoltaics (IPV), University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany ; Helmholtz Young Investigator Group FRONTRUNNER, IEK5-Photovoltaik, Forschungszentrum Jülich, 52425, Jülich, Germany
Redinger, Alex ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
External co-authors :
yes
Language :
English
Title :
Coevaporation Stabilizes Tin-Based Perovskites in a Single Sn-Oxidation State
Publication date :
23 August 2022
Journal title :
Nano Letters
ISSN :
1530-6992
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
European Projects :
H2020 - 786483 - Solar Cofund 2 - SOLAR-ERA.NET Cofund 2
Name of the research project :
FnR: 11244141, 11696002, 13390539, 14757355, 12246511, 14735144
Funders :
FNR - Fonds National de la Recherche [LU]
DFG - Deutsche Forschungsgemeinschaft [DE]
Spanish Ministry of Science and Education
Federal Ministry for Economic Affairs and Energy
Israel Ministry of Energy
CE - Commission Européenne [BE]
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since 29 September 2022

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