水热法制备柔性TiO_2纳米管复合薄膜电极

Preparation of Flexible TiO_2 Nanotube Composite Thin Film Electrodes by Hydrothermal Method

目的利用水热法制备得到的TiO_2纳米管粉末制备柔性TiO_2复合薄膜电极,提升电池的光电性能.方法利用水热法制备TiO_2纳米管,控制TiO_2纳米管水热合成时间、温度两个重要参数,通过掺杂不同TiO_2纳米管以及改变TiO_2纳米管的掺量分别制样,测试电池的光电转化效率.结果 150℃48 h制备TiO_2纳米管性能参数最佳,掺杂5%纳米管粉末的薄膜电极的光电性能为1.37%.结论温度和时间的增加对TiO_2纳米管的水热合成有明显影响,三种条件下温度和时间达到最高时,TiO_2纳米管的管长、管径均达到最佳值,掺杂TiO_2纳米管粉末的薄膜电极的光电性能亦随之逐渐提高.随着TiO_2纳米管掺量的增多,其制备电极的染料吸附量也随之调高,其光电性能呈现先增大后降低的趋势.

In this paper, a hydrothermal method was modified to improve the photovoltaic perform- ance of flexible dye-sensitized solar cells. TiO2 nanotube powders were prepared through hydrothermal process, a variety of TiO2 nanotubes with different structures and morphologies had been synthesized by adjusting two important parameters：the temperature and time of hydrothermal synthesis. These TiO2 nanotubes were then doped to the flexible TiO2 thin film electrodes, and the photoelectric conversion efficiency of the corresponding fabricated solar cells had been measured accordingly. The results showed that TiO2 nanotubes prepared under conditions of 150 ℃ and 48h gained optimal performance parameters; while the photoelectric properties of the thin film electrode with 5% nanotube powder doping reached its highest value of 1.37%. In conclusion, with the in- crease of hydrothermal synthesis time and temperature, both tube length and tube diameter shows a gradual increasing trend, the photoelectric properties of doped TiO2 thin film electrodes also increases gradually. On the other hand, although the dye absorption amount increase with the increasing TiO2 nanotubes doping, the photoelectric performance shows a tendency of first increase and later decrease.