Enhanced photovoltaic effect of TiO<sub>2sub>-based composite ZnFe<sub>2sub>O<sub>4sub>/TiO<sub>2sub>
- 作者：Z.L. Zhang<sup>asup> ; M. Wan<sup>csup> ; Y.L. Mao<sup>asup><sup> ; sup><sup>bsup><sup> ; sup><sup>ylmao1@163.comsup>
- 关键词：Composite ; TiO2 ; ZnFe2O4 ; Enhanced photovoltaic effect
- 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
- 出版年：2012
- 期刊代码：66_10106030
- 类别：ch
- 出版时间：1 April, 2012
- 卷：233
- 期：Complete
- 页码：15-19
- 文件大小：750 K
摘要
A TiO<sub>2sub>-based composite, ZnFe<sub>2sub>O<sub>4sub>/TiO<sub>2sub>, was prepared with a commercial TiO<sub>2sub> (Degussa P25) and ZnFe<sub>2sub>O<sub>4sub> nanopowders using a simple method. The composite was characterized by X-ray diffraction (XRD), UV-vis absorption spectrum, surface photovoltage spectroscopy (SPS) and SEM. The composite presents an enhanced photovoltaic effect compared with the pure TiO<sub>2sub>. The trap distributions of TiO<sub>2sub> and ZnFe<sub>2sub>O<sub>4sub>/TiO<sub>2sub> composite were investigated and the energy levels of TiO<sub>2sub> and ZnFe<sub>2sub>O<sub>4sub> were analyzed. The results indicate that the enhancement of photovoltaic effect is mainly due to the increase of photo-generated carrier concentration and improvement of the separation efficiency of photo-generated carriers by the addition of ZnFe<sub>2sub>O<sub>4sub>.