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XPS evidence of degradation mechanism in hybrid halide perovskites

The paper presents the results of measurements of XPS valence band spectra of SiO2/MAPbI3 hybrid perovskites subjected to irradiation with visible light and annealing at an exposure of 0-1000 hours. It is found from XPS survey spectra that in both cases (irradiation and annealing) a decrease in the I:Pb ratio is observed with aging time, which unambiguously indicates PbI2 phase separation as a photo and thermal product of degradation. The comparison of the XPS valence band spectra of irradiated and annealed perovskites with density functional theory calculations of the MAPbI3 and PbI2 compounds have shown a systematic decrease in the contribution of I 5p-states and allowed us to determine the threshold for degradation, which is 500 hours for light irradiation and 200 hours for annealing.

preprint2019arXivOpen access
I. S. ZhidkovA. I. PoteryaevA. KukharenkoL. D. FinkelsteinS. O. CholakhA. F. AkbulatovP. A. TroshinC. -C. ChuehE. Z. Kurmaev
physics.app-phcond-mat.mtrl-sci
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Open access9 authors2 topics
Imported metadata coverageMissing code, dataset, citation and institution fields are tracked without dominating the paper.Details
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I. S. ZhidkovA. I. PoteryaevA. KukharenkoL. D. FinkelsteinS. O. CholakhA. F. AkbulatovP. A. TroshinC. -C. ChuehE. Z. Kurmaev

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