Abstract
The formation of buffer-free charge carrier selective Mg–Ag cathodes for donor-copper phthalocyanine (CuPc):acceptor-C60 bulk heterojunction organic solar cells is investigated. An optimum charge carrier selectivity is achieved with Mg:Ag/Ag cathode structures, where the Mg:Ag alloy layer has a composition close to that of Ag3Mg. In addition, Mg diffusion into CuPc:C60 layer is observed. As a result, an interaction between Mg and Cu2+ with a concurrent change in oxidation state of both metals takes place. However, no formation of magnesium phthalocyanine is observed.
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