Investigation of organic photovoltaics using a well-designed donor and acceptor interface
Kyohei NAKANO1, Keisuke TAJIMA1
The interface of two organic semiconducting materials has critical importance for charge separation and recombination processes in organic photovoltaic devices. In this article, we introduce our study on the precise control of organic-organic interfaces and their effects on photovoltaic performance by using planar heterojunction structures. We have developed two technical tools; a contact film transfer method to construct the well-defined planar interfaces and surface segregated monolayers to modify the surface of the thin films of the organic semiconductors. The combination of these techniques enables us to control the properties of the interfaces. We discuss our recent studies on the effects of the energetic cascade structures at the interfaces on the photovoltaic performance.
- 1 RIKEN, The Center for Emergent Matter Science (CEMS), Emergent Functional Polymers Research Team