Preparation and performance of dye-sensitized solar cells based on ZnO-modified TiO2 electrodes
The ZnO-modified TiO2 electrode was prepared by adding Zn(CH3COO)2·2H2O to the TiO2 colloid during the sol-gel production process, and was used in dye-sensitized solar cells (DSCs). The open circuit voltage (V OC) and fill factor (ff) of the cells were improved significantly. The performances of the ZnO-modified TiO2 electrode such as dark current, transient photocurrent, impedance, absorption spectra, and flat band potential (V fb) were investigated. It is found that the interface charge recombination impedance increases and V fb shifts about 200 mV toward the cathodic potential. The effect mechanism of ZnO modification on the performance of DSCs may be that ZnO occupies the surface states of the TiO2 film.
Keywordsdye-sensitized solar cells TiO2 electrode modification photoelectrochemical properties
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- W. Kubo, T. Kitamura, K. Hanabusa, et al., Quasi-solid-state dye-sensitized solar cells using room temperature molten salts and a low molecular weight gelator, Chem. Commun., (2002), p.374.Google Scholar
- K. Tennakone, G.R.R.A. Kumara, I.R.M. Kottegoda, et al., An efficient dye-sensitized photoelectrochemical solar cell made from oxides of tin and zinc, Chem. Commun., 1999, No.1, p.15.Google Scholar
- J. Van de Lagemaat, N.G. Park, and A.J. Frank, Influence of electrical potential distribution charge transport and recombination on the photopotential and photocurrent conversion efficiency of dye-sensitized nanocrystalline TiO2 solar cells: A study by electrical impedance and optical modulation techniques, J. Phys. Chem. B, 104(2000), p.2044.CrossRefGoogle Scholar
- S.J. Roh, R.S. Mane, S.K. Min, et al., Achievement of 4.51% conversion efficiency using ZnO recombination barrier layer in TiO2 based dye-sensitized solar cells, Appl. Phys. Lett., 89(2006), Art. No.253512.Google Scholar