Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (3): 446-452.doi: 10.3866/PKU.WHXB201401022

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Fabrication and Photovoltaic Performance of High Efficiency Front-Illuminated Dye-Sensitized Solar Cell Based on Ordered TiO2 Nanotube Arrays

GAO Su-Wen1, LAN Zhang1,2,3, WU Wan-Xia1, QUE Lan-Fang1, WU Ji-Huai1,2,3, LIN Jian-Ming1,2,3, HUANG Miao-Liang1,2,3   

  1. 1 Institute of Materials Physical Chemistry, Huaqiao University, Xiamen 361021, Fujian Province, P. R. China;
    2 Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Xiamen 361021, Fujian Province, P. R. China;
    3 Key Laboratory of Functional Materials for Fujian Higher Education, Xiamen 361021, Fujian Province, P. R. China
  • Received:2013-11-15 Revised:2013-12-31 Published:2014-02-27
  • Contact: LAN Zhang E-mail:lanzhang@hqu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (U1205112, 51002053), Key Project of the Ministry of Education of China (212206), Program for Prominent Young Talents in Fujian Province University, China; Program for New Century Excellent Talents in Fujian Province University, China, and Promotion Program for Yong and Middle-aged Teacher in Science and Technology Research of Huaqiao University, China (ZQN-YX102).

Abstract:

An efficient front-illuminated dye-sensitized solar cell (DSSC) based on ordered TiO2 nanotube (TNT) arrays was prepared. Sintering at 450 ℃ avoided damage of the ordered TNTs during HF treatment. Fast electron transport channels were maintained in the membrane, for efficient charge transportat in the DSSC. The sintered TNT membranes were subsequently treated with HF, TiCl4, and HF combined with TiCl4. This formed a rougher surface, and allowed increased dye loadings. The increased dye loading improved the light harvesting efficiency of the photoanode at 300-570 nm wavelength range, which is the main absorption region of the adsorbed dye. The adsorbed dye had a low absorption at 570-800 nm wavelength range. The enhanced light harvesting efficiency of the photoanode originated from its increased diffuse reflectance. The incident-photon-to-current and absorbed-photon-to-current conversion efficiencies were increased over the entire 300-800 nm wavelength range. This resulted in an increased short-circuit current density of the DSSC. Electrochemical impedance spectroscopy indicated that electron transport and related parameters including charge transport resistance, interfacial charge recombination resistance, distributed chemical capacitance, electron lifetime, effective electron diffusion length, and collection efficiency were significantly improved in the DSSC containing the treated TNT photoanode. This also resulted in an enhanced photovoltaic performance. The maximum power conversion efficiency from combining HF and TiCl4 treatments was 7.30%, which was a 35.69% enhancement compared with the nontreated DSSC (5.38%).

Key words: TiO2 nanotube array, Dye-sensitized solar cell, Photoanode, HF, TiCl4

MSC2000: 

  • O644