The authors develop organic photovoltaic cells with multicharge separation (MCS) interfaces by inserting a very thin layer of metal phthalocyanine. The devices with MCS interface allow one to control short-circuit current density (Jsc) and open-circuit voltage (Voc). The power conversion efficiency (ηp) of the device with MCS interface (Cu-phthalocyanine/C60andpentaceneC60) is enhanced compared with that of the device with single charge separation interface (pentacene/C60). The enhancement of ηp is attributable to the increase in Voc with maintaining the Jsc. By using Zn-phthalocyanine, which possesses longer excited lifetime compared with Cu-phthalocyanine, both Jsc and Voc have been improved simultaneously and the ηp reaches 2.04%.

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