Preparation Of Dye Sensitized Solar Cell Based On ZnO Composite Electrode

As one kind of the third generation solar cells, Dye sensitized solar cell (DSSC) is has lot of advantages such as simple manufacturing process and cost-effective advantages, so it is an important research direction of the solar cells. TiO2is the most commonly used photoanode materials of DSSC. TiO2films composed by TiO2particles with different morphology and size have big difference in specific surface area, pore volume, and grain arrangements, thereby resulting the difference in dye absorption, electron transport, optical absorption, light scattering and reflection. Ultimately, the efficiency of solar cell was affected.ZnO has excellent optical and electrical properties, good biocompatibility and chemical stability. In addition, compared with TiO2, ZnO has a higher electron mobility, which can reduce transferring time of electron to reach the outer circuit and thus having less electron loss.This research focus on fabrication of composite photoanode from TiO2and ZnO with special morphology, such as ZnO nanotetrapods and Zno nanorods, by the way of screen printing, electrophoresis deposition and spray coating. It is expected to improve electron capture ability and inhibit the recombination of photoinduced electron-hole, and futhur to improve the conversion efficiency. Major work includes the following contents:(1)20nm and60nm sized TiO2was prepared by hydrothermal method. photoanode of DSSC was fabricated from this two kinds of TiO2by the way of screen printing. N3, N719and D102were used as sensitizer to investigate the conversion efficiency of DSSC. DSSC with composite photoanode showed the best conversion efficiency.(2)ZnO/TiO2composite photoanodes were fabricated by screen printing, electrophoresis deposition, spray coating and nanorods growth-dip coating. The morphology of ZnO/TiO2composite films were characterized by SEM I-V curves of these ZnO/TiO2composite photoanode DSSCs were measured. TiO2/ZnO/TiO2composite photoanode DSSC prepared by screen printing has the highest conversion efficiency of1.87%.(3) Prepared CdS quantum dot composite ZnO nanorods structure DSSC, with gold as the counter electrode, and test its photoelectric conversion efficiency, to study the effects of CdS quantum dots on the composite of ZnO nanorods structure DSSC performance influence.