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Preparation and Characterization of Mixed Halide MAPbI 3− x Cl x Perovskite Thin Films by Three‐Source Vacuum Deposition
Author(s) -
Babaei Azin,
Soltanpoor Wiria,
Tesa-Serrate Maria A.,
Yerci Selcuk,
Sessolo Michele,
Bolink Henk J.
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900784
Subject(s) - perovskite (structure) , photoluminescence , iodide , halide , thin film , deposition (geology) , electroluminescence , materials science , chloride , characterization (materials science) , vacuum deposition , stoichiometry , inorganic chemistry , chemical engineering , chemistry , nanotechnology , optoelectronics , crystallography , metallurgy , layer (electronics) , sediment , biology , engineering , paleontology
Chloride is extensively used in the preparation of metal halide perovskites such as methylammonium lead iodide (MAPbI 3– x Cl x ), but its persistence and role in solution‐processed materials has not yet been rationalized. Multiple‐source vacuum deposition of perovskites enables a fine control over thin‐film stoichiometry and allows the incorporation of chemical species irrespective of their solubility. Herein, the first example of mixed MAPbI 3– x Cl x thin films prepared by three‐source vacuum deposition is presented using methylammonium iodide (MAI), PbI 2 , and PbCl 2 as precursors. The optoelectronic properties of the material are evaluated through photovoltaic and electro‐/photoluminescent characterizations. Besides the very similar structural and optical properties of MAPbI 3 and MAPbI 3– x Cl x , an increased electroluminescence efficiency, longer photoluminescence lifetimes, as well as larger photovoltage, are observed in the presence of chloride, suggesting a reduction of nonradiative charge recombination.