Effect of UV light irradiation on photovoltaic characteristics of inverted polymer solar cells containing sol-gel zinc oxide electron collection layer

► Relationship between the heating temperature of the ZnO layer and the device performance was investigated. ► The effects of UV light contained in simulated sunlight were investigated by I-V and impedance spectroscopy measurements. ► In the case of the ZnO prepared by heating at 250 °C, the photovoltaic feature was shown under irradiation of UV-cut light.