Hydration of mixed halide perovskites investigated by Fourier transform infrared spectroscopy
Source abstract
Abstract
The mixed lead halide perovskites are promising candidates for solar cells, but the intrinsic instabilities due to phase segregation, halide migration, and hydration hinder the practical applications. Currently, less attention is paid to the humidity induced degradation. This important issue of mixed halide perovskites is now investigated by Fourier transform infrared (FTIR) spectroscopy. After hydration of CH3NH3Pb(I1−xBrx)3, a broad band at around 3200 cm−1 of –OH vibration appears in the FTIR spectra and the bands in the range of 1200–1700 cm−1 become much stronger. The dominant FTIR mode at 1660 cm−1 due to the intermediate complex is sensitive on hydration, implying it could be used as a characteristic peak to evaluate the hydration degree of mixed halide perovskites. These information are of interest to optimize the crystal structure of this material to improve the stability so that to promote the photovoltaic applications.
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Research context
OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Chalcogenide Semiconductor Thin Films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Jiangsu Key Lab on Opto-Electronic Technology, Center for Quantum Transport and Thermal Energy Science, School of Physics and Technology, Nanjing Normal University 1 , Nanjing 210023, China
School of Physics and Telecommunication Engineering, Zhoukou Normal University 2 , Zhoukou 466001, China
Department of Electrical Engineering and Computer Science, Ningbo University 3 , Ningbo 315211, China
Funding
National Natural Science Foundation of China · China Postdoctoral Science Foundation · Jiangsu Planned Projects for Postdoctoral Research Funds
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