Understanding Effects of Cesium in CH(NH2)2PbI3 for Stabilizing CH(NH2)2PbI3/CsPbI3 Interface under UV Illumination
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Author list: Limpamanoch P., Rujisamphan N., Kumnorkaew P., Amornkitbamrung V., Tang I.-M., Zhang Q., Supasai T.
Publisher: American Chemical Society
Publication year: 2019
Volume number: 123
Issue number: 19
Start page: 12117
End page: 12125
Number of pages: 9
ISSN: 1932-7447
eISSN: 1932-7447
Languages: English-Great Britain (EN-GB)
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Abstract
In solution-processed perovskite semiconductors, ultraviolet (UV) radiation can induce structural degradation in the light-absorbing layer, for instance, methylammonium lead iodide (MAPbI3). In this paper, we use modulated surface photovoltage (SPV) spectroscopy to track the mechanisms of photo-generated charge generation and separation as well as the formation of defects in formamidinium lead triiodide (FAPbI3) and cesium (Cs)-containing FAPbI3 (FAxCs1-xPbI3) perovskite when exposed to different durations of UV-light treatment. The measured SPV signals (in-phase and out-phase (shifted by 90°)) were found to be strongly dependent on the addition of Cs and on the UV exposure times. Upon the partial incorporation of Cs, the improved stability in the structural and optical properties was observed. The formation of the δ-CsPbI3 phase in the FAxCs1-xPbI3 perovskite is attributed to the stabilization of the FAPbI3/CsPbI3 interface, which would efficiently inhibit the phase segregation and provide for a stable medium for the modulated charge separation under UV illumination. © 2019 American Chemical Society.
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