柔性有序ZnO纳米棒/TiO_2纳米粒子复合薄膜的制备及其光电转换性能研究

Preparation and Photoelectric Conversion Property of Flexible Oriented ZnO Nanorod/TiO_2 Nanoparticles Composite Thin Films

采用电沉积法,在柔性不锈钢网基底上制备了ZnO纳米棒阵列,随后旋涂P25浆料,最终经退火后得到了ZnO纳米棒阵列/TiO_2纳米粒子的复合结构薄膜,详细探讨了TiO_2纳米粒子的填充,初级ZnO纳米棒阵列的形貌,P25浆料的旋涂次数以及表面活性剂PEG添加量等制备条件对复合结构光阳极形貌及光电性能的影响。研究表明:TiO_2纳米粒子的引入能有效提高光阳极的比表面积,增强半导体与染料的耦合能力,ZnO纳米棒阵列能够为电子提供快速传输的通道。最佳制备条件为:初级ZnO纳米棒沉积次数为两次,浆料浓度为1 g/50 m L,旋涂浆料次数为三次,PEG添加量为4 g/100 m L,制备的复合结构DSSC的光电转换效率较单一纳米棒阵列有一定的提高。

ZnO nanorod arrays （ZNRAs） were synthesized on flexible stainless steel mesh （SSM） by an electrodeposition method. P25 slurry was spin-coated on ZNRAs. Finally, the ZNRAs/TiO2 nanoparticles （TNPs） composite thin films were prepared after sintered. The effects of preparing conditions such as the filling of TiO2 nanoparticles, the morphology of primary ZNRAs, the spin coating times of P25 slurry and the additive amount of surface active agent of PEG on the morphology and related photoelectric properties of the photoanode with composite structures were investigated in detail. The results show that the introduction of TNPs could effectively improve the specific surface area of the photoanode and enhance the coupling ability between semiconductor and dye. The ZNRAs could provide the rapid transmission channels for electrons. Under the optimal preparing conditions, the electrodepositon times for primary ZNRAs is two, the concentration of slurry is 1 g/50 mL, the spin coating times of slurry is three, the additive amount of PEG is 4 g/100 mL. Compared with the simple ZNRAs, the photo-to-electric conversion efficiency of the DSSC based on composite structure improved to some extent.