Abstract
Polymer solar cells based on blends of conjugated polymer and zinc oxide (ZnO) nanoparticles degrade very fast under simulated solar light illumination due to the considerably increased photoconductivity of ZnO upon ultraviolet light exposure. It is reported that the stability of hybrid polymer solar cells with ZnO as electron acceptors is improved by using an optical layer to decrease ultraviolet light distribution inside the active layer. The power conversion efficiency of control solar cell drops to 0.3% of its original value after 10 min simulated solar light exposure while that of the cell with optimized optical layer is maintained at 87.1%.
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