Initial Stages of Phoodegradation of MAPBI3 Perovskite: Accelerated Study by Concentrated Sunlight
Renjun Guo a, Mark V. Khenkin a, Georgios Arnaoutakis a, Nataliya Samoylova a, Ambrose A. Melvin a, Jeremy Barbe b, Harrison Ka Hin Lee b, Wing Chung Tsoi b, Iris Visoly-Fisher a, Eugene A. Katz a
a Dept. of Solar Energy and Environmental Physics, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet-Ben-Gurion, Israel
b SPECIFIC, College of Engineering, Swansea University, Bay Campus, Fabian Way,
nanoGe Perovskite Conferences
Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
International Conference on Perovskite Thin Film Photovoltaics
Jerusalem, Israel, 2019 February 24th - 27th
Organizers: Lioz Etgar and Kai Zhu
Oral, Eugene A. Katz, presentation 016
DOI: https://doi.org/10.29363/nanoge.nipho.2019.016
Publication date: 21st November 2018

In experiments with concentrated sunlight, we previously demonstrated a strong effect of sample temperature on the photochemical decomposition of MAPbI3 thin films [1]. The latter was accompanied with degradation of the perovskite light absorption and growth of PbI2 peaks in the UV-Vis light absorption spectra and XRD patterns. Here, we report a systematic study of the initial stages of photodegradation of MAPbI3 thin films with independent control of the sample temperature and light intensity (from 50 to 700 suns). We demonstrated that photostability of the MAPbI3 film is extremely sensitive to the sample temperature. Under the combined action of light and heat (either by concentrated sunlight or by external heating), a strong reduction of the film photoluminescence (PL) without changes in the perovskite light absorption was observed during the initial stages of degradation. On the contrary, illumination of perovskite films (with intensity up to 500 suns) without heating (using chopped concentrated sunlight) induces considerable PL enhancement while the optical absorption spectrum remains unchanged. Underlying mechanisms for the observed effects are discussed on the basis of micrometer-scale Raman and PL mapping of the samples treated under various experimental conditions.

 

 

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