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- W3205560856 abstract "Since the photocharge generation efficiency has reached nearly 100% for recent organic photovoltaic film materials, clarification of loss mechanisms becomes of increasing importance. Here, we report a new time-resolved measurement method that enables simultaneous detection of the optical absorption and electric current due to photogenerated carriers in organic semiconductor films. Microsecond-order decays of both the number density (recombination) and the averaged drift mobility (trapping) of photocarriers are quantitatively observed for an identical device of a regioregular poly[3-hexylthiophene-2,5-diyl]:(6,6)-phenyl C61 butyric acid methyl ester bulk heterojunction film. The decay feature of the time-dependent mobility is highly dispersive especially at lower temperatures. It can be explained by fast thermalization of “hot” photocarriers into lower energy sites, which is followed by thermally activated hopping. This quantitative time-resolved observation method can be a powerful tool for characterization and optimization of photovoltaic materials." @default.
- W3205560856 created "2021-10-25" @default.
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- W3205560856 date "2021-10-12" @default.
- W3205560856 modified "2023-10-17" @default.
- W3205560856 title "Realtime Observation of Carrier Trapping and Recombination in a Bulk Heterojunction Film by Simultaneous Optical and Electrical Detection" @default.
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- W3205560856 doi "https://doi.org/10.1021/acs.jpcc.1c06879" @default.
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