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• W2524952045 abstract "There is mounting evidence that long-range charge separation determines the efficiency of organic photovoltaic cells, yet different mechanisms remain under debate. One class of proposed mechanism is ultrafast coherent long-range charge separation, and another is a slower process whereby charges incoherently hop apart with a transiently enhanced mobility due to morphology and disorder. Here, we use transient absorption spectroscopy to probe incoherent charge separation dynamics in two different ways. First, we use a family of polymers whose backbone structures allows us to compare 2- phase donor-acceptor morphologies with 3-phase morphologies that feature an intermixed region. In the 3-phase system, we see pronounced spectral signatures associated with charges (holes) occupying the disordered intermixed region, and we track separation via biased charge diffusion to more ordered neat regions on the timescale of hundreds of picoseconds. Secondly, by resolving bimolecular charge recombination at high excitation density, we show that charge mobilities must be substantially enhanced on early timescales, which may be sufficient for separation to occur. Together, these measurements provide support for models of incoherent and relatively slow charge separation." @default.
• W2524952045 created "2016-10-07" @default.
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• W2524952045 date "2016-09-26" @default.
• W2524952045 modified "2023-09-25" @default.
• W2524952045 title "Incoherent charge separation dynamics in organic photovoltaics" @default.
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• W2524952045 doi "https://doi.org/10.1117/12.2238234" @default.
• W2524952045 hasPublicationYear "2016" @default.
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