| Summary: | 碩士 === 國立東華大學 === 光電工程學系 === 104 === The dye-sensitized solar cells (DSSCs) with ZnO micro-flower photoelectrode were studied on the effect of glucose molecular as a modified layer on ZnO surface toward power conversion characteristics. The structures of DSSCs based on ZnO as a photoelectrode, N719 as a dye sensitizer, iodine/iodide solution as an electrolyte and Pt/FTO as a counter electrode. Glucose molecular layer was prepared by immersing photoelectrode in 1M glucose solution to make glucose molecular attach on the surface of ZnO micro-flower , and functioned as a protection layer on the ZnO surface to avoid the aggregation of N719 dye. The photocurrent, photovoltage and power conversion efficiency characteristics for DSSCs were measured under illumination of simulated sunlight obtained from a solar simulator with the radiant power of 100 mW/ cm2.
In this research, we provide a simple way to elevate the efficiency about two times. It was found that ZnO DSSCs with glucose molecular layer exhibited highest current density of 13.48mA/cm2 and highest power conversion efficiency of 5.31% than device without modification layer (Jsc=6.76mA/cm2, efficiency =2.76%). The enhancement of the power conversion efficiency can be explained that the modification layer achieves the uniform coverage of N719 dye, and prolong the recombination lifetime of excited carriers.
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