TiO2纳米棒阵列的可控合成及其光电性能

Controllable Synthesis of the TiO2 Nanorod Array and Its Photoelectric Properties

采用简单的水热路线合成出TiO2纳米棒阵列,作为染料敏化太阳电池（DSSC）光阳极,并对其形貌、结构和光电特性进行表征。探讨了前驱体溶液总量、Ti源加入量等对产物形貌以及DSSC性能的影响。研究结果表明：增加前驱体溶液中Ti源的加入量将使纳米棒长度和直径同时增加,最终导致形成＂蒲公英＂状产物,DSSC性能有所提高,同时暗电流也会随之增大;增加前驱体溶液总量也会使纳米棒更长、更密,但DSSC性能提高幅度不大,暗态电流密度-电压（J-V）曲线几乎没有变化。研究将有助于人们更清楚地认识TiO2纳米棒阵列的生长动力学机制,进而优化纳米棒阵列光电器件的性能。

The TiO2 nanorod array（ NRA） was synthesized as the photoanode of the dye-sensitized solar cell（ DSSC） through the facile hydrothermal route,and the morphology,structure and photoelectric property of the TiO2 nanorod array were characterized. The influences of the precursor solution total content and Ti source amount on the product morphology and DSSC performance were investigated. The study results show that the length and diameter of the nanorod increase simultaneously with the increase of Ti source amount in the precursor solution,leading to the formation of ＂ dandelion＂ structure as well as the enhancement of DSSC perfor-mance and dark current. Besides,the nanorod can get longer and denser with the increase of the precursor solution total content,but the improvement of the DSSC performance is not obvious,and the dark current density-voltage（ J-V） curve has little change. The study will be helpful for understanding the growth dynamics mechanism of the TiO2 nanorod array and optimizing the properties of the nanorod array photoelectric device.