Abstract
AbstractWe have investigated photovoltaic properties of organic solar cells using polymer‐fullerene bulk‐heterojunction films doped with coumarin dyes. Whereas the coumarin molecules used in this study had similar absorption bands, evident difference was observed in the open‐circuit voltage as well as in the short‐circuit current. In particular, the doping of coumarin 307 was found to cause a distinct enhancement in the open‐circuit voltage. On the other hand, the doping of coumarin 30 gave a serious degradation in the device performance. These results were strongly associated with calculated molecular energies of the doped dyes, especially with the highest occupied molecular orbital energy. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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