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Open-circuit voltage (VOC) plays a key role of determining the power conversion efficiency for solar cells, as well as short-circuit current. However, the origins of VOC have still remained unsolved for organic solar cells. Although VOC has been reported to depend on the electronic states at the Donor/Acceptor (D/A) interface such as the energy difference (DEHL) between HOMO (the highest occupied molecular orbital) of donor and LUMO (the lowest unoccupied molecular orbital) of acceptor, somedoi:10.1380/jsssj.33.93 fatcat:dnpx5ie3r5edxh3ifpnex66lsa