Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (5): 873-880.doi: 10.3866/PKU.WHXB201403042

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Modification of Single-Crystal TiO2 Nanorod Arrays and Its Application in Quantum Dot-Sensitized Solar Cells

WANG Shi-Mao1, DONG Wei-Wei1,2, FANG Xiao-Dong1,2, DENG Zan-Hong1,2, SHAO Jing-Zhen1,2, HU Lin-Hua2, ZHU Jun2   

  1. 1 Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, P. R. China;
    2 Key Laboratory of Novel Thin Film Solar Cells, Chinese Academy of Sciences, Hefei 230031, P. R. China
  • Received:2014-01-13 Revised:2014-03-04 Published:2014-04-25
  • Contact: DONG Wei-Wei, FANG Xiao-Dong E-mail:wwdong@aiofm.ac.cn;xdfang@aiofm.ac.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2011CBA00700), National High Technology Research and Development Program of China (863) (2011AA050527), and National Natural Science Foundation of China (51172237, 61306082, 61306083).

Abstract:

Single-crystal TiO2 nanorod arrays (TNRs) are proposed to increase the electron transport rate and improve the cell performance of quantum dot- sensitized solar cells (QDSCs). However, the specific surface area of TNRs is much lower than that of TiO2 nanoparticle films, which leads to lower quantum dot adsorption and lower power conversion efficiency (η). In our investigation, TiCl4 solution was used to modify single-crystal rutile TNRs. The modification resulted in the synthesis of a large number of TiO2 nanoparticles on the surfaces of nanorods, which significantly increased the surface area and quantum dot adsorption of TNRs. When the TiCl4 modification time was 60 h, the short-circuit photocurrent density (Jsc) and η of TNRs based CdS/CdSe co-sensitized QDSCs increased from (2.93±0.07) mA·cm-2 and 0.36%±0.02% to (8.19±0.12) mA·cm-2 and 1.17%±0.07%, respectively. In addition, intensity modulated photocurrent spectroscopy measurements indicated that the electron transport rate in modified single-crystal rutile TNRs is faster than that in anatase TiO2 nanoparticle films, which is a desirable result.

Key words: Quantum dot-sensitized solar cell, Photoanode, Titanium dioxide, Nanorod array, Modification, Electron transport

MSC2000: 

  • O646