Preparation and performance of dye-sensitized solar cells based on ZnO-modified TiO₂ electrodes

Sheng-jun Li 1,2),Yuan Lin 2),Wei-wei Tan 2),Jing-bo Zhang 2),Xiao-wen Zhou 2),Jin-mao Chen 2),and Zeng Chen 1) 1) College of Physics and Electrics,He’nan University,Kaifeng 475004,China 2) Beijing National Laboratory for Molecular Sciences,Key Laboratory of Photochemistry,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080,China

摘 要：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.

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