The effect of the highest occupied molecular orbital energy level offset, Delta E(HOMO), on organic photovoltaic cells has been investigated using a set of donor/C(60) heterojunction structures with Delta E(HOMO) up to 1.1 eV provided by various donors. The open-circuit voltage decreases with Delta E(HOMO) whereas the short-circuit current and fill factor increase with Delta E(HOMO) but roll off with Delta E(HOMO) >0.7 eV. These characteristics can be simulated using a Braun-Onsager model and assuming an interfacial charge-transfer state with an initial charge separation distance proportional to Delta E(HOMO) and an increased decay rate at high Delta E(HOMO). (C) 2010 American Institute of Physics. [doi:10.1063/1.3491214]
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