Organic small molecule solar cells with a homogeneously mixed copper phthalocyanine: C_(60) active layer

摘要

An efficient organic solar cell with a vacuum codeposited donor-acceptor copper phthalocyanine (CuPc):C_(60) mixed layer is described. A device with a structure of indium tin oxide/330 A CuPc:C_(60)(1:1)/100 A C_(60)/75 A 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline/Ag has a series resistance of only R_(S)=0.25 Ωcm~(2), resulting in a current density of ～1 A/cm~(2) at a forward bias of +1 V, and a rectification ratio of 10~(6) at ±1 V. Under simulated solar illumination, the short circuit current density increases linearly with light intensity up to 2.4 suns. The maximum power conversion efficiency is η_(P)=(3.6±0.2)% at 0.3 suns (AM1.5G simulated solar spectrum) and η_(P)=(3.5±0.2)% at 1 sun. Although the fill factor decreases with increasing intensity, a power efficiency as high as η_(P)=(3.3±0.2)% is observed at 2.4 suns intensity.