水热合成温度对二氧化钛薄膜结晶性能和染料吸附性能的影响

The Effect of Hydro-Thermal Synthesis Temperature on the Dye Sensitized TiO_2 Electrode

用溶剂热合成的凝胶在50℃下得到了结晶性能好、厚度合适、对染料分子吸附能力良好的TiO2疏松膜。在不同温度下水热合成了TiO2凝胶,然后在低温下通过丝网印刷的方法制备了TiO2薄膜,浸渍在染料溶液中制备了染料敏化的TiO2薄膜。用X射线仪观察了TiO2薄膜的晶体类型和结晶性能。TiO2薄膜的膜厚情况通过扫描电镜来观察。敏化后的TiO2薄膜的光学性能通过紫外-可见光吸收谱来测定。结果表明在本研究所选的温度下,TiO2电极均表现出良好的结晶性能。从膜厚和光学性能的测试结果来看,用240℃下水热合成的TiO2来制备的染料敏化太阳能薄膜表现出的性能是最好的,最适宜用于制备柔性的染料敏化太阳能电池。

TiO2 nano particles were hydro-thermal synthesized at different temperatures, and then screen-printed into TiO2 films. Dye sensitized TiO2 electrode was prepared through dipping in the dye solution. The crystal structure and crystallization property of TiO2 film was characterized by X-ray diffractions. The thickness of TiO2 electrode was observed by Scanning Electrode Microscope. The optical property of the electrode was measured by UV-Vis spectra. The results show that, at the chosen temperature, TiO2 electrodes have good crystallization property. From the thickness and optical property measurement, TiO2 film hydro-thermal synthesized at 240 ℃ is the most appropriate one to use as electrode at flexible dye sensitized solar cells.