Modification of Donor/Acceptor Interface for Efficient Organic Photovoltaics

We overview our recent progress in interfacial modifications, and discuss an ideal interfacial structure to realize highly efficient OSCs. Energetic structures of donor and acceptor materials near their interface affect device performance; however, only tuning their energy level may not be enough to achieve efficient solar cells. A key factor that should be considered is an additional interlayer between the donor and the acceptor, which has been proposed to form naturally in mixed bulk-heterojunction type solar cells.