[21p-W531-1~8] Present Situation and Future Prospects of Organic Solar Cells

[21p-W531-4] Controls of Donor/Acceptor Interfaces in Polymer Solar Cells

〇Keisuke Tajima^1,2 (1.RIKEN CEMS, 2.JST-PRESTO)

Keywords:organic solar cells,interfaces,nanostructures

We investigated the relationship between the structures of donor/acceptor interfaces and the efficiency of solar cells by using bilayer heterojunction structures as model systems. The bilayer heterojunctions with well-defined interfaces are fabricated by combining transfer of the polymer films and the surface segregated monolayers. We showed the effects of interfacial dipole moments, thin insulating layers and the energy transfer based on an organic dye, and the cascade structure for the charge carriers on the performance. The charge cascade at the interface was very effective to simultaneously achieve high charge separation efficiency and suppressed charge recombinations. To implement the ideal interfacial structures into the bulk heterojunctions, we propose the use of block copolymers and their spontaneous formation of the nanostructures.