Highly efficient photovoltaic cells composed of interpenetrating conducting polymer/C60 heterojunction

Photovoltaic properties of a photovoltaic cell with a structure of indium-tin-oxide (ITO)/C 60 /conducting polymer (CP)/Au have been investigated. The C 60 /CP heterojunction in the photovoltaic cell was fabricated by spin-coating the solution of CP onto the C 60 thin film formed on ITO. Fabricated by this process, the photovoltaic cell has demonstrated the high efficiency for solar cells based on CPs. From the optical properties of C 60 /CP heterojunction and the direct surface observation by using scanning electron microscope and atmic force microscope, it has been clarified that the interpenetrating interface of C 60 and CP contributes to the high photovoltaic performance.