Bulk Heterojunction Solar Cells with Large Open‐Circuit Voltage: Electron Transfer with Small Donor‐Acceptor Energy Offset

Abstract

Photoinduced electron transfer is observed in polymer bulk heterojunction solar cells with very small interfacial energy offset. The results imply that open circuit voltage values close to the band gap of the semiconducting polymer should be possible for polymer bulk heterojunction solar cells just as for inorganic solar cells.