| Summary: | 碩士 === 逢甲大學 === 環境工程與科學學系 === 105 === As the rare earth element in the up-conversion of nano-semiconductor materials with strong light stability, narrow luminescence band and high chemical stability. The organic solar cells because of the quality of light easy to carry, the production process is simple and the components with the advantages of the application, etc., in recent years, low-cost research is one of the important areas of solar cells.
In this study, bismuth sulfide / graphene composites were prepared by microwave. The purge time was 40 minutes, the reaction temperature was 160 ℃, the microwave irradiation time was 20 minutes, the surfactant was 1 wt% CTAB, and the graphene doping weight ratio 2.4 wt% has the best synthesis conditions. The composition of the elements were confirmed by XRD, XPS, FE-SEM, TEM and EDS, Mapping, and the properties of the materials were confirmed to facilitate the pre- paration of dye sensitized solar cells.
In the photoelectric conversion efficiency test of different solar cell components, it was found that the optimum photoelectric conversion efficiency was 39.93% with the weight ratio of 0.1 wt% bismuth sulfide / graphene and the absorption wavelength at 340 nm, 40.62% of the electrodes. The photoelectric conversion efficiency of 9.1 wt% bismuth sulfide / graphene on the electrode is much greater than that of the platinum counter electrode with full wavelength. The 9.1 wt% bismuth sulfide / graphene electrode has a short-circuit current of 6.445 mA/cm2, which is platinum electrode 3.228 mA/cm2 twice as much. However, the effect of ZnO composites in DSSC is not ideal. It is presumed that the grain size of ZnO and Yb / Ho / ZnO composites prepared by microwave synthesis is too large, about 10μm. When the incident light is too strong, severe scattering may be more suitable as a light scattering layer than the light absorbing layer.
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