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- W1856467912 abstract "The role of excess excitation energy on long-range charge separation in organic donor/acceptor bulk heterojunctions (BHJs) continues to be unclear. While ultrafast spectroscopy results argue for efficient charge separation through high-energy charge-transfer (CT) states within the first picosecond (ps) of excitation, charge collection measurements suggest excess photon energy does not increase the current density in BHJ devices. Here, the population dynamics of charge-separated polarons upon excitation of high-energy polymer states and low-energy interfacial CT states in two polymer/fullerene blends from ps to nanosecond time scales are studied. It is observed that the charge-separation dynamics do not show significant dependence on excitation energy. These results confirm that excess exciton energy is not necessary for the effective generation of charges." @default.
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- W1856467912 date "2015-10-26" @default.
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- W1856467912 title "Charge Photogeneration in Organic Photovoltaics: Role of Hot versus Cold Charge-Transfer Excitons" @default.
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- W1856467912 doi "https://doi.org/10.1002/aenm.201501032" @default.
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