Abstract
Compared to conjugated polymerpoly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene](MDMO-PPV) solar cells, bulk heterojunction solar cells composed ofzinc oxide (ZnO) nanocrystals and MDMO-PPV have a better energyconversion efficiency. However, ultraviolet (UV) light deteriorates theperformance of solar cells composed of ZnO and MDMO-PPV. We propose amodel to explain the effect of UV illumination on these ZnO:MDMO-PPVsolar cells. According to this model, the degradation from UVillumination is due to a decrease of exciton dissociation efficiency.Our model is based on the experimental results such as the measurementsof current density versus voltage, photoluminescence, and photocurrent.
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