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• W2014548503 abstract "Charge transfer (CT) states at a donor–acceptor heterojunction have a key role in the charge photogeneration process of organic solar cells, however, the mechanism by which these states dissociate efficiently into free carriers remains unclear. Here we explore the nature of these states in small molecule–fullerene bulk heterojunction photovoltaics with varying fullerene fraction and find that the CT energy scales with dielectric constant at high fullerene loading but that there is a threshold C60 crystallite size of ~4 nm below which the spatial extent of these states is reduced. Electroabsorption measurements indicate an increase in CT polarizability when C60 crystallite size exceeds this threshold, and that this change is correlated with increased charge separation yield supported by CT photoluminescence transients. These results support a model of charge separation via delocalized CT states independent of excess heterojunction offset driving energy and indicate that local fullerene crystallinity is critical to the charge separation process. Interfacial charge transfer states are believed to have an important role in the performance of organic solar cells. Bernardo et al.show that delocalization achieved through local fullerene order is critical to achieving long-range charge separation from these otherwise tightly bound states." @default.
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• W2014548503 date "2014-02-03" @default.
• W2014548503 modified "2023-10-01" @default.
• W2014548503 title "Delocalization and dielectric screening of charge transfer states in organic photovoltaic cells" @default.
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• W2014548503 doi "https://doi.org/10.1038/ncomms4245" @default.
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