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首页> 外文期刊>Advanced functional materials >Thermal and Photo-Degradation Study of -FAPbI_3-Based Perovskite Using In Situ X-Ray Diffraction
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Thermal and Photo-Degradation Study of -FAPbI_3-Based Perovskite Using In Situ X-Ray Diffraction

机译：Thermal and Photo-Degradation Study of -FAPbI_3-Based Perovskite Using In Situ X-Ray Diffraction

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摘要

Hybrid halide perovskite has established its credibility as high performancethin film photovoltaic technology. Perovskite based on formamidinium cationis at the core composition to top performances and stability. Herein, a depthstudy based on temperature-controlled in situ X-ray diffraction focusing onthe photo-active formamidinium lead iodide ( -FAPbI_3) is reported. Inparticular, the thermal stability of the latter and the degradation pathwaysunder different experimental conditions are clarified. Based on this in situtechnique, the lattice thermal expansion coefficient is reported that providesrelevant information on possible mechanical stress created upon temperaturecycling or damp heat test. The results support that -FAPbI_3 degradation issubstantially accelerated when temperature is combined to illumination andwhen it is interfaced with the extraction layers. In addition, by contrast to indarkness for which -FAPbI_3 degrades directly into PbI_2, the existence of atemperature gap under illumination involving an intermediate step with anon-crystalline phase resulting from the perovskite degradation andcontributing to the formation of PbI_2 by-product is revealed.

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