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染料敏化纳米晶太阳能电池电极制备与优化
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摘要
染料敏化纳米晶太阳能电池是基于光电化学的新型太阳能电池。与传统太阳能电池相比,它选用廉价、对环境无污染的二氧化钛作为原料,而且制作工艺简单。近年来,有关其工作原理和应用的研究成为世界范围内研究的热点。开展该领域的研究对于开发廉价的太阳能利用途径、缓解全球范围的能源危机和环境问题具有很重大的意义。
     光阳极制备选用商业化纳米二氧化钛粉体,改变粉体分散工艺和多孔膜烧结工艺制备出性能优异的纳米晶多孔膜,并通过添加造孔剂、增加厚度、掺入大颗粒和表面修饰的方法对多孔膜进行优化。当选用酒精和水作为分散介质,球磨后得到的浆料能够制备出缺陷少、与基底牢固结合的纳米晶多孔膜。烧结时,选用FTO导电玻璃作为导电基底,将多孔膜在500℃温度烧结30min能够获得最优的光电转换效率。添加造孔剂和增加厚度都能够增大短路电流,但会导致开路电压降低。四叔丁基吡啶修饰后电池开路电压将大幅度提升。
     对电极制备选用氯铂酸作为原料,通过热解法和电镀法制备出不同形态的铂对电极。然后选用相同的光阳极和电解质封装电池,测试电池性能。研究表明,铂对电极比碳对电极性能更加优异,铂元素在电极表面的形貌和分布都能够影响到电池的性能。
     选用不同材料封装电池,测试电池性能,并讨论测试过程中的影响因素。实验表明:选用聚氯乙烯薄膜封装能够满足实验室条件下短时间内测试电池性能的要求;增大入射光强度能够提高短路电流,降低填充因子,对开路电压影响不大;增大电池有效面积将使电池的性能大幅度衰减。
Dye-sensitized solar cell(DSC) is a kind of novel solar cell based on photoelectrochemical principles. Compared to the conventional solar cells, it use cheap and environment-friendly titanium dioxide as raw material. The fabrication methods of DSC are very simple and convenient. Thus, interests in the study of dye-sensitized solar cell have grown considerably in recent years from the fundamental aspect to the application perspective. DSC is regarded as the potential feasible cheap way to ultilize solar energy and overcome the energy crisis and environment problem. In the thesis, the fabrication of titanium-based photo-anode and the optimization of DSC were studied. Then the light-to-current conversion efficiency of DSC was also discussed.
     The photo-anode is made of commercial nano-size titanium dioxide powder. Different powder dispersion techniques and annealing techniques have been used to fabricate photo-anode. Porous film made of paste which was dispersed using water and ethanol as dispersive agent can adhere to the conductive substrate firmly. The optimization photo-to-current performance has been achieved by annealing the photo-anode at 500℃for 30min. The amount of additive and the thickness of the film can affect the short-circuit current and open-circuit voltage of DSC. The addition of TBP can increase the open-circuit voltage.
     The platinum counter electrodes with different morphology have been made by electroplating and heat decomposition deposition of hexachloroplatinic acid. The performance of DSC using different platinum has been tested.
     Epoxy, silicone sealant and PVC film have been used to assemble cells. The research finds that PVC film is the best sealant to seal the DSC. Finally, the establishment of cell’s performance test system has been illustrated, and the detail effect has been discussed.
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