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)/C60/conducting polymer (CP)/Au have been investigated. The C60/CP heterojunction in the photovoltaic cell was fabricated by spin-coating the solution of CP onto the C60 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 C60/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 C60 and CP contributes to the high photovoltaic performance.