物理化学学报 >> 2012, Vol. 28 >> Issue (04): 850-856.doi: 10.3866/PKU.WHXB2012020111

电化学和新能源 上一篇    下一篇

TiO2表面氧空位对Rup2P/TiO2/ITO薄膜电极光致电荷转移的影响

程辉1,2, 董江舟2, 巢晖3, 姚江宏1,2, 曹亚安1,2   

  1. 1. 南开大学物理科学学院, 天津 300071;
    2. 南开大学泰达应用物理学院, 弱光非线性光子学教育部重点实验室, 天津 300457;
    3. 中山大学化学与化学工程学院, 广州 510275
  • 收稿日期:2011-11-02 修回日期:2012-01-05 发布日期:2012-03-21
  • 通讯作者: 姚江宏, 曹亚安 E-mail:yaojh@nankai.edu.cn; caoyaan@yahoo.com
  • 基金资助:

    国家自然科学基金(50872056, 51072082, 21173121, 11074129)资助项目

Infection of Oxygen Vacancy at the TiO2 Surface for Film Electrode Rup2P/TiO2/ITO Photo-Induced Charge Transfer

CHENG Hui1,2, DONG Jiang-Zhou2, CHAO Hui3, YAO Jiang-Hong1,2, CAO Ya-An1,2   

  1. 1. College of Physics, Nankai University, Tianjin 300071, P. R. China;
    2. Teda Applied Physics School, The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai University, Tianjin 300457, P. R. China;
    3. School of Chemical and Chemistry Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
  • Received:2011-11-02 Revised:2012-01-05 Published:2012-03-21
  • Contact: YAO Jiang-Hong E-mail:yaojh@nankai.edu.cn; caoyaan@yahoo.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50872056, 51072082, 21173121, 11074129).

摘要: 采用改性的TiCl4水解法制备出三种不同表面性质的TiO2-X (X=5, 10, 20, X表示加入NaOH的浓度, 单位为mol·L-1)样品. 利用(1,10-邻菲咯啉)2-2-(2-吡啶基)苯咪唑钌混配配合物(Rup2P)作为敏化剂, 制备出Rup2P/TiO2-5/ITO (铟锡金属氧化物)、Rup2P/TiO2-10/ITO和Rup2P/TiO2-20/ITO表面敏化薄膜电极. 测试结果表明三种薄膜电极的光电转换效率Rup2P/TiO2-10/ITO最高, Rup2P/TiO2-20/ITO次之, Rup2P/TiO2-5/ITO最低. 利用吸收光谱、表面光电压(SP)谱、荧光光谱和表面光电流作用谱等分析了Rup2P和三种TiO2的能带结构和表面性质; 利用光致循环伏安和表面光电流作用谱研究了三种Rup2P/TiO2-X/ITO薄膜电极的光致界面电荷转移过程. 结果表明, 在光致界面电荷转移过程中, TiO2层表面氧空位对Rup2P/TiO2-X/ITO薄膜电极光致电荷转移产生重要影响. 并进一步讨论了Rup2P/TiO2-X/ITO薄膜电极的光电流产生机理.

关键词: Rup2P, TiO2, 表面敏化, Rup2P/TiO2-X/ITO, 光致电荷转移

Abstract: The surface properties of TiO2-X (X=5, 10, 20, X=[NaOH] (in mol·L-1)) samples prepared by modification of hydrolyzed TiCl4 were studied. The surface-sensitized Ru(phen)2(PIBH) (Rup2P) (phen= phenanthroline, PIBH=pyridyl benzimidazole hybrid) film electrodes Rup2P/TiO2-5/ITO (indium tin oxide), Rup2P/TiO2-10/ITO, and Rup2P/TiO2-20/ITO were prepared. Among the three films, the photovoltaic properties of Rup2P/TiO2-10/ITO were the best and those of Rup2P/TiO2-5/ITO were the worst. The band structures, and properties on the surfaces of Rup2P and the three TiO2 samples were analyzed using absorption spectra, surface photovoltage spectra, photoluminescence spectra, and photocurrent action spectra. The photo-induced charge transfer process was studied by cyclic voltammetry under irradiation and photocurrent action spectra. The results revealed the oxygen vacancy at the TiO2 surface was very important for the photo-induced charge transfer process of Rup2P/TiO2-X/ITO. The photocurrent mechanism of Rup2P/TiO2-X/ITO is discussed.

Key words: Rup2P, TiO2, Surface-sensitization, Rup2P/TiO2-X/ITO, Photo-induced charge transfer

MSC2000: 

  • O646