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Imbalanced mobilities causing S-shaped IV curves in planar heterojunction organic solar cells
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/content/aip/journal/apl/98/6/10.1063/1.3553764
2011-02-08
2015-03-26

Abstract

We show that S-kinks in the current voltage characteristics, which decrease the fill factor significantly, can be caused by a strong imbalance of charge carriermobilities(hole mobility in donor and electron mobility in acceptor) in planar/flat heterojunction organic solar cells. Electrical simulations according to a drift-diffusion model predict the occurrence of an S-kink for a mobility mismatch factor larger than 100. By combining a low-mobility donor material, (1,2,3,4,9,10,11,12-octaphenyl-diindeno[-lm]perylene), with the acceptors and -dimethylperylene-3,4:9,10-dicarboximide, which show different electron mobilities, we experimentally verify the predictions. Our results demonstrate that not only interfaceeffects but also the photoactive material itself can cause S-kinks.

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Scitation: Imbalanced mobilities causing S-shaped IV curves in planar heterojunction organic solar cells
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/6/10.1063/1.3553764
10.1063/1.3553764
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