p-i-n like behavior in three-layered organic solar cells having a co-deposited interlayer of pigments

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Abstract
Three‐layered organic solar cells, having a sandwiched interlayer of co‐deposited p‐type phthalocyanine (Pc) pigments and n‐type perylene derivative (PTC) pigments, exhibited photocurrent enhancement when compared with two‐layered cells without the interlayer. A large number of Pc/PTC molecular contacts within the interlayer serve as active sites for effective charge carrier photogeneration. The photovoltaic characteristics of the three‐layered configuration suggest the formation of a p‐i‐n like structure, in which the built‐in potential produced by Fermi level differences in the respective pigment layers is mainly distributed across the co‐deposited interlayer. Inorganic semiconductor films are also shown to be applicable to the present p‐i‐n cell structure as an n layer to obtain larger photovoltages.