Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (06): 1219-1224.doi: 10.3866/PKU.WHXB20090526

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Photoelectrochemical Properties of N3 Sensitized Ho3+ Modified TiO2 Nanocrystalline Electrodes

YANG Shu-Ming, KOU Hui-Zhi, WANG Ling, WANG Hong-Jun, FU Wen-Hong   

  1. College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, Henan Province, P. R. China
  • Received:2008-11-24 Revised:2009-02-18 Published:2009-06-05
  • Contact: YANG Shu-Ming


Effects of Ho3+ ion modification on photoelectrical properties of TiO2 electrodes were investigated. On the one hand, the Ho3+ layer decreased electron injection between the dye and TiO2, but on the other hand, it suppressed charge recombination. Experimental results showed that an energy barrier was formed when the TiO2 electrode was modified with a Ho3+ layer of a certain thickness. This energy barrier efficiently suppressed charge recombination. As a result, the photovoltage and photoelectrical conversion efficiency were improved under optimal conditions. Photoelectrical conversion efficiencies of TiO2/Ho-0.1 and TiO2/Ho-0.2 (0.1 and 0.2 are the concentrations of Ho3+ solution used for modification, mol·L-1) electrodes reached 8.3%and 7.6%, respectively, under illumination with white light at 93.1 mW·cm-2. This represents an increase of about 15% and 5%, respectively, compared to a bare TiO2 electrode (7.2%).

Key words: Surface modification, TiO2 nanocrystalline electrode, Dye sensitized solar cell, Photoelectrical property


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