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R. Alex Marsh, Justin M. Hodgkiss and Richard H. Friend Direct Measurement of Electric Field-Assisted Charge Separation in Polymer:Fullerene Photovoltaic Diodes Advanced Materials 22

Version of Record online: 20 AUG 2010 | DOI: 10.1002/adma.201001010

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The electric field dependence of transient optical absorption of photogenerated charge carriers in working organic photovoltaic cells is reported. Charge lifetimes are extended under reverse bias, revealing that the mechanism of photocurrent generation is the electric field-assisted separation of Coulombically bound charge pairs in kinetic competition with geminate charge recombination.

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