Proceedings of Perovskite Thin Film Photovoltaics (ABXPV16)
Publication date: 14th December 2015
In perovskite solar cells (PSC) clear long-lived photoinduced absorption features are found. Some of these features are also found on bare MAPbI3 films on glass substrates, specifically a strong bleach at 760 nm, which is not due to fluorescence. Experimental evidence suggests that this feature is caused by a Stark effect: internal electric field builds up in the perovskite films under illumination. Photoinduced absorption measurement in the frequency domain measurements (1-105 Hz) demonstrate processes occurring on a sub-microsecond time scale as well as a very slow process on the second time scale. We proposed that that first feature may be related to charge trapping, while the latter has the characteristic feature of diffusion and is likely related to ion movements. It appears to be related to hysteresis effects found in the solar cells after light excitation. In PSC the photoinduced features (as well as potential-induced features) are more complex than in bare films, as additional electron and ion transfer processes occur at the interfaces. A complete model will be presented.
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