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Dye-sensitized nanocrystalline TiO2 films based on Pechini sol-gel method using PEG with different molecular weights

G. LIANG1, J. XU2, W. XU2,* , X. SHEN2, H. ZHANG2, M. YAO3

Affiliation

  1. College of Materials Science & Engineering, Xi'an Jiao tong University, Xi'an 710049, China
  2. Wuhan Textile University, Wuhan 430073, China
  3. Xi'an Polytechnic University Xi'an 710049, China

Abstract

Mesoporous titanium oxide (TiO2) films were prepared based on nanocrystalline TiO2 powder (Degussa P25) and Pechini sol-gel method by introducing polyethylene glycols (PEG) with different molecular weights. The films based on longer PEG segments showed the bigger pores and looser structures, which led to higher dye adsorption but bigger interfacial resistance. The optimized performance of the assembled dye-sensitized solar cells (DSSCs) was obtained with PEG of M w =1000, yielding short-circuit photocurrent density (Jsc) of 6.22 mA/cm2 , open-circuit photovoltage (Voc) of 0.691 V and conversion efficiency (η) of 4.05 %, under the use of polyethylene oxide (PEO) gel electrolyte..

Keywords

Dye-sensitized solar cells, TiO2 films, PEG, Pechini sol-gel method.

Submitted at: June 28, 2010
Accepted at: Aug. 12, 2010

Citation

G. LIANG, J. XU, W. XU, X. SHEN, H. ZHANG, M. YAO, Dye-sensitized nanocrystalline TiO2 films based on Pechini sol-gel method using PEG with different molecular weights, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 8, pp. 1759-1764 (2010)