Impact of Humidity and Temperature on the Stability of the Optical Properties and Structure of MAPbI3, MA0.7FA0.3PbI3 and (FAPbI3)0.95(MAPbBr3)0.05 Perovskite Thin Films

Marie Solange Tumusange; Biwas Subedi; Cong Chen; Maxwell M Junda; Zhaoning Song; Yanfa Yan; Nikolas J Podraza

doi:10.3390/ma14144054

Impact of Humidity and Temperature on the Stability of the Optical Properties and Structure of MAPbI₃, MA_0.7FA_0.3PbI₃ and (FAPbI₃)_0.95(MAPbBr₃)_0.05 Perovskite Thin Films

Materials (Basel). 2021 Jul 20;14(14):4054. doi: 10.3390/ma14144054.

Authors

Marie Solange Tumusange¹, Biwas Subedi¹, Cong Chen¹, Maxwell M Junda¹, Zhaoning Song¹, Yanfa Yan¹, Nikolas J Podraza¹

Affiliation

¹ Department of Physics & Astronomy and The Wright Center for Photovoltaics Innovation & Commercialization, University of Toledo, Toledo, OH 43606, USA.

Abstract

In situ real-time spectroscopic ellipsometry (RTSE) measurements have been conducted on MAPbI₃, MA_0.7FA_0.3PbI₃, and (FAPbI₃)_0.95(MAPbBr₃)_0.05 perovskite thin films when exposed to different levels of relative humidity at given temperatures over time. Analysis of RTSE measurements track changes in the complex dielectric function spectra and structure, which indicate variations in stability influenced by the underlying material, preparation method, and perovskite composition. MAPbI₃ and MA_0.7FA_0.3PbI₃ films deposited on commercial fluorine-doped tin oxide coated glass are more stable than corresponding films deposited on soda lime glass directly. (FAPbI₃)_0.95(MAPbBr₃)_0.05 films on soda lime glass showed improved stability over the other compositions regardless of the substrate, and this is attributed to the preparation method as well as the final composition.

Keywords: optical properties; perovskite thin films; real time spectroscopic ellipsometry; stability.

Abstract

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