光阳极结构对染料敏化太阳能电池性能的影响

Effects of Photoanode Structure on Performances of Dye-sensitized Solar Cells

染料敏化太阳能电池是一种新型的太阳能电池,通常用钛片做光阳极。用钛网代替钛片制备光阳极可组装成一种新型结构的染料敏化太阳能电池。采用电化学阳极氧化法,在磁力搅拌质量分数0.25%NH4F+体积分数2.25%H2O+乙二醇电解液作用下,在钛网和钛片表面制备TiO2纳米管阵列。其中,一组阳极氧化后的试样在具有微米颗粒的溶液中超声震荡。将制得的试样做光阳极组装染料敏化太阳能电池,并测试电池性能。用扫描电镜观察TiO2纳米管阵列。研究结果表明:阳极氧化所制备的TiO2纳米管阵列表面有覆盖层,超声处理可移去覆盖层,试样表面露出高度有序的纳米管阵列便于N719染料的灌入,而有效地提高染料敏化太阳能电池的光电转化效率。钛网光阳极组装的染料敏化太阳能电池比相同条件下钛片组装的电池,光电转换效率提高了7.4倍。

Dye sensitized solar cells(DSSCs)are a new type of solar cells,in which Ti foil is usually used as photoanode. Ti mesh,instead of Ti foil,as photoanode used to assemble DSSCs is novel structure. TiO2 nanotube arrays were synthesized in 0. 25% NH4 F + 2. 25% H2 O + ethylene glycol electrolyte under magnetic stirring by anodization of Ti foil and Ti mesh. Some anodized specimens in solution with micro-powders were stirred by ultrasonic vibration. The anodized specimens were used as photoanodes to assemble dye-sensitized solar cells and the performance of the cells was tested. The morphologies of TiO2 nanotube arrays were observed by a scanning electron microscope. The results show that there is non-tube layer on TiO2 nanotube arrays and the non-tube layer can be removed by ultrasonic treatment. Highly ordered nanotube arrays are beneficial to filling N719 dye,resulting in improvement of photoelectric conversion efficiency of dye-sensitized solar cell.The photoelectric conversion efficiency of dye-sensitized solar cell with Ti mesh as photoanode is 7. 4 times higher than that with Ti foil as photoanode.