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  Dittrich, Th.; Lang, F.; Shargaieva, O.; Rappich, J.; Nickel, N.H.; Unger, E.; Rech, B.: Diffusion length of photo-generated charge carriers in layers and powders of CH₃NH₃PbI₃ perovskite. Applied Physics Letters 109 (2016), p. 073901/1-4

10.1063/1.4960641
Open Access Version (externer Anbieter)

Abstract:
The diffusion or transport lengths of photo-generated charge carriers in CH3NH3PbI3 layers (thickness up to 1 μm) and powders has been directly measured with high accuracy by modulated surface photovoltage after Goodman. The values of the diffusion lengths of photo-generated charge carriers ranged from 200 nm to tenths of μm. In thin CH3NH3PbI3 layers the transport lengths corresponded to the layer thickness whereas in thicker layers and in crystallites of CH3NH3PbI3 powders the grain size limited the diffusion length. For grains, the diffusion length of photo-generated charge carriers depended on the measurement conditions.