No abstract

The ZnO-modified TiO 2 electrode was prepared by adding Zn(CH 3 COO) 2 ·2H 2 O to the TiO 2 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 TiO 2 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 TiO 2 film.