Publication date: 31st May 2020
The initial stages of photo‐degradation of CH3NH3PbI3 (MAPbI3) thin films prior to any significant change in light absorption are studied in experiments with independent control of sample temperature and intensity of concentrated sunlight from 50 to 500 suns. Photo‐stability of the MAPbI3 film is revealed to be 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 can be observed during the initial stages of degradation. In contrast, 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. With accurate temperature control, aging under concentrated sunlight results in similar instability trends as that under 1 sun.
E.A.K. acknowledges partial support from the SNaPSHoTs project in the framework of the German‐Israeli bi‐lateral R&D cooperation in the field of applied nanotechnology. M.V.K. and E.A.K. thank the financial support of the United States – Israel Binational Science Foundation (grant no. 2015757). G.E.A. and N.A.S. are grateful to the Jacob Blaustein Center for Scientific Cooperation for a postdoctoral research fellowships and R.J.G to the Albert Katz Graduate School (BGU) for a Master fellowship. W.C.T. acknowledges the Ser Cymru funding from the Welsh Assembly Government (Ser Solar). H.K.H.L. thanks the SPECIFIC Innovation and Knowledge Centre (EP/N020863/1), and J.B. is grateful to Airbus Endeavr Wales for its financial support.
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