TiO_2纳米管的制备及其在染料敏化太阳能电池中的应用

THE PREPARATION OF TITANIUM DIOXIDE NANOTUBES AND ITS APPLICATION IN DYE-SENSITIZED SOLAR CELLS

以氟化铵的乙二醇溶液为电解液,采用电化学阳极氧化法在钛片表面构筑了一层结构有序、纳米级的TiO_2纳米管阵列膜层,应用扫描电子显微镜(SEM)对膜层的形貌进行了表征,利用X射线衍射(XRD)研究了样品的晶相、结构,并分析了阳极氧化电压对TiO_2纳米管尺寸和结构的影响。结果表明:阳极氧化电压对TiO_2纳米管阵列的结构起到关键的作用,随着纳米管的管径和长度的增加,表面积增大。研究了TiO_2纳米管阵列膜层结构对染料敏化太阳能电池(DSSC)性能的影响。结果表明:二氧化钛纳米管阵列薄膜的管径对电池的效率有显著影响,当管径越大时,填充因子变大,DSSC的开路电压降低,而短路电流变大,光电转换效率也随之提高。

TiO2 nanotube arrays were prepared by anodic oxidation method in NH4F and ethylene glycol solution under different anodization voltage. The SEM and XRD experiments were performed to characterize the morphology and crystalline phase of the TiO2 nanotube arrays. It was found that the morphology of the TiO2 nanotube arrays was greatly associated with the anodization voltage. The length, diameter and specific surface area could be effectively increased by the increasing of anodization voltage. The dependence of performance of dye-sensitized solar cell （DSSC） on the morphology of TiO2 nanotube arrays was investigated. The results indicate that tube diameter has significant effect on the performance of DSSC. When tube diameter is increased, the filling factor will increase, the open circuit voltage will decrease, the short circuit current and the light-to-electricity conversion efficiency will increase.