Effect of MoO3 as an interlayer on the performance of organic solar cells based on ZnPc and C60

The effect of molybdenum trioxide (MoO3) as an interlayer is investigated on device performance of organic solar cells using zinc phthalocyanine (ZnPc):fullerene-C60 (C60) as the active layer. Our results indicate that the insertion of MoO3 has little effects on the surface topography or absorption properties, but noticeably increases the shunt resistance, which leads to the improvement of open-circuit voltage, short-circuit current and fill factor. As a result, the power conversion efficiency (PCE) of the devices can be improved by up to 25%. An optimum PCE of 3.43% was achieved with the insertion of 10 nm MoO3.