Citation: LIU Qiu-Ping, HUANG Hui-Juan, ZHOU Yang, DUAN Yan-Dong, SUN Qing-Wen, LIN Yuan. Photovoltaic Performance of Dye-Sensitized Solar Cells Based on Al-Doped TiO₂ Thin Films[J]. Acta Physico-Chimica Sinica, ;2012, 28(03): 591-595. doi: 10.3866/PKU.WHXB201112161 shu

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

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 Date: 26 October 2011
Available Online: 16 December 2011
Fund Project: 国家重点基础研究发展规划项目(973) (2006CB202605) (973) (2006CB202605) 国家高技术研究发展计划项目(863) (2007AA05Z439) (863) (2007AA05Z439)国家自然科学基金项目(20973183)资助 (20973183)

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.
- Titanium dioxide,
- Al-doped film,
- Hydrothermal method,
- X-ray photoelectron spectroscopy,
- Photovoltaic performance,
- Flat band potential
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Photovoltaic Performance of Dye-Sensitized Solar Cells Based on Al-Doped TiO₂ Thin Films