Abstract
Abstract Large energy losses in open-circuit voltage (VOC) are still an issue for the photo-conversion efficiency of organic solar cells (OSCs). We clarify the relationship between charge recombination and VOC loss for phthalocyanine/fullerene planar heterojunction (PHJ) OSCs. We quantify the VOC loss relative to the charge-transfer state energy by the temperature dependence of VOC. The charge recombination order obtained from impedance measurements indicates the presence of trap-assisted recombination. Our results suggest that the VOC losses are caused by the broad distribution of the tail state near the donor/acceptor (D/A) interface in the PHJ device. Thus, reducing the number of trap states near the D/A interface could lead to an increase in VOC.
Published Version
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