Abstract
The effect of I–/Cl–and I–/Br–mixing on the thermal and photochemical degradation of organometallic perovskite MeNH3PbI3 (MAPbI3) was studied by X-ray photoelectron spectroscopy, which revealed the opportunity to essentially increase the photo and thermal stabilities of the material depending on the level and position of halide-mixing. The largest positive effect was observed for the small concentration of chloride substituent (MAPbI2.7Cl0.3), while the full halide substitution (MAPbBr3) had a negative effect on the stability of hybrid perovskite.
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