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Effect of the highest occupied molecular orbital energy level offset on organic heterojunction photovoltaic cells

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3 Author(s)
Zhang, Minlu ; Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, USA ; Wang, Hui ; Tang, C.W.

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The effect of the highest occupied molecular orbital energy level offset, ΔEHOMO, on organic photovoltaic cells has been investigated using a set of donor/C60 heterojunction structures with ΔEHOMO up to 1.1 eV provided by various donors. The open-circuit voltage decreases with ΔEHOMO whereas the short-circuit current and fill factor increase with ΔEHOMO but roll off with ΔEHOMO>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 ΔEHOMO and an increased decay rate at high ΔEHOMO.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 14 )

Date of Publication:

Oct 2010

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