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• W1423677979 abstract "We have investigated the photophysics in neat films of conjugated polymer PBDTTPD and its blend with PCBM using terahertz time-domain spectroscopy. This material has very high efficiency when used in organic solar cells. We were able to identify a THz signature for bound excitons in neat PBDTTPD films, pointing to important delocalization in those excitons. Then, we investigated the nature and local mobility (orders of magnitude higher than bulk mobility) of charges in the PBDTTPPD:PCBM blend as a function of excitation wavelength, fluence and pump-probe time delay. At low pump fluence (no bimolecular recombination phenomena), we were able to observe prompt and delayed charge generation components, the latter originating from excitons created in neat polymer domains which, thanks to delocalization, could reach the PCBM interface and dissociate to charges on a time scale of 1 ps. The nature of the photogenerated charges did not change between 0.5 ps and 800 ps after photo-excitation, which indicated that the excitons split directly into relatively free charges on an ultrafast time scale." @default.
• W1423677979 created "2016-06-24" @default.
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• W1423677979 date "2015-09-09" @default.
• W1423677979 modified "2023-10-03" @default.
• W1423677979 title "Charge generation in organic solar cell materials studied by terahertz spectroscopy" @default.
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• W1423677979 doi "https://doi.org/10.1117/12.2187473" @default.
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