物理化学学报 >> 2012, Vol. 28 >> Issue (03): 591-595.doi: 10.3866/PKU.WHXB201112161

电化学和新能源 上一篇    下一篇

基于铝离子掺杂二氧化钛薄膜的染料敏化太阳能电池的光电性能

刘秋平1,2,3, 黄慧娟4, 周洋1, 段彦栋3, 孙庆文3, 林原3   

  1. 1. 北京交通大学机械与电子控制工程学院, 北京 100044;
    2. 江西理工大学软件学院, 南昌 330013;
    3. 中国科学院化学研究所光化学重点实验室, 北京分子科学国家实验室, 北京 100190;
    4. 九江职业技术学院, 江西九江 332000
  • 收稿日期:2011-10-26 修回日期:2011-12-13 发布日期:2012-02-23
  • 通讯作者: 周洋, 林原 E-mail:Yzhou@bjtu.edu.cn; liuyuan@iccas.ac.cn
  • 基金资助:

    国家重点基础研究发展规划项目(973) (2006CB202605), 国家高技术研究发展计划项目(863) (2007AA05Z439)及国家自然科学基金项目(20973183)资助

Photovoltaic Performance of Dye-Sensitized Solar Cells Based on Al-Doped TiO2 Thin Films

LIU Qiu-Ping1,2,3, HUANG Hui-Juan4, ZHOU Yang1, DUAN Yan-Dong3, SUN Qing-Wen3, LIN Yuan3   

  1. 1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, P. R. China;
    2. College of Software, Jiangxi University of Science and Technology, Nanchang 330013, P. R. China;
    3. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China;
    4. Jiujiang Vocational & Technical College, Jiujing 332000, Jiangxi Province, P. R. China
  • Received:2011-10-26 Revised:2011-12-13 Published:2012-02-23
  • Contact: ZHOU Yang, LIN Yuan E-mail:Yzhou@bjtu.edu.cn; liuyuan@iccas.ac.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2006CB202605), National High-Tech Research and Development Program of China (863) (2007AA05Z439), and National Natural Science Foundation of China (20973183).

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摘要： 采用水热法制备出Al3+掺杂二氧化钛薄膜, 通过玻璃棒涂于导电玻璃上, 在450 °C的温度下烧结并将其用N3染料敏化制成染料敏化太阳能电池(DSSCs). 通过X射线光电子能谱(XPS)、X射线衍射(XRD)、扫描电镜(SEM)及DSSCs测试系统对其进行了测试表征, 研究了Al3+掺杂对TiO2晶型及染料敏化太阳能电池的光电性能影响. XPS数据显示Al3+成功掺杂到了TiO2晶格内, 由于Al3+的存在, 对半导体内电子和空穴的捕获及阻止电子/空穴对的复合发挥重要作用. 莫特-肖特基曲线显示掺杂Al3+后二氧化钛平带电位发生正移, 并导致电子从染料注入到TiO2的驱动力提高. DSSCs系统测试结果表明, Al3+掺杂的TiO2薄膜光电效率达到6.48%, 相对于无掺杂的纯二氧化钛薄膜光电效率(5.58%), 其光电效率提高了16.1%, 短路光电流密度从16.5 mA·cm-2提高到18.2 mA·cm-2.

关键词: 二氧化钛, 铝掺杂薄膜, 水热法, X射线光电子能谱, 光电性能, 平带电位

Abstract: Al-doped TiO2 thin films were synthesized by the hydrothermal method. To prepare a working electrode, a TiO2 or AlTiO2 slurry was coated onto a fluorine-doped tin oxide glass substrate by the doctor blade method and the coated substrate was sintered at 450 ° C. TiO2 and Al-doped TiO2 films were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and tested by the dye-sensitized solar cell (DSSCs) system. The influences of Al-doping on TiO2 crystal form and the photovoltaic performance of DSSCs were investigated. X-ray photoelectron spectroscopy (XPS) data indicate that the doped Al ions exist in the form of Al3+ , and these ions play a role as e- or h+ traps and reduce the e-/h+ pair recombination rate. The corresponding Mott- Schottky plot indicates that the Al-doped TiO2 photoanode shifts the flat band potential positively. The positive shift of the flat band potential improves the driving force of injected electrons from the LUMO of the dye to the conduction band of TiO2. The Al-doped TiO2 thin film shows a photovoltaic efficiency of 6.48%, which is higher than that of the undoped TiO2 thin film (5.58%) and the short-circuit photocurrent density increases from 16.5 to 18.2 mA·cm-2.

Key words: Titanium dioxide, Al-doped film, Hydrothermal method, X-ray photoelectron spectroscopy, Photovoltaic performance, Flat band potential