Journal
CHEMICAL PHYSICS LETTERS
Volume 398, Issue 1-3, Pages 27-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2004.09.030
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Using an extension of the Onsager model of exciton dissociation in the bulk of a disordered solid, we determine the separation probability of geminate electron-hole pairs following exciton dissociation by charge-transfer at a donor-acceptor interface. The donor-acceptor interface confines the electron and hole in their respective layers, leading to charge separation with a probability that is significantly higher than predicted by bulk theory. The model explains the surprisingly high carrier collection efficiencies observed in organic donor-acceptor photovoltaic cells, and correctly predicts the voltage-dependence of the photocurrent which differs substantially from that of conventional inorganic semiconductor p-n junctions and may ultimately limit the power conversion efficiency of organic donor-acceptor photovoltaic cells. (C) 2004 Elsevier B.V. All rights reserved.
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