Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
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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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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