Photosensitization of TiO2 nanoparticulate thin film electrodes by CdS nanoparticles |
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| Authors: | Xinming Qian Dongqi Qin Yubai Bai Tiejin Li Xinyi Tang Erkang Wang Shaojun Dong |
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| Affiliation: | (1) Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Jilin, Changchun 130022, P. R. China,;(2) College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China,;(3) Department of Chemistry, Jilin University, Jilin, Changchun 130023, P. R. China, |
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| Abstract: | Surface photovoltage spectra (SPS) measurements of TiO2 show that a large surface state density is present on the TiO2 nanoparticles and these surface states can be efficiently decreased by sensitization using CdS nanoparticles as well as by suitable heat treatment. The photoelectrochemical behavior of the bare TiO2 thin film indicates that the mechanism of photoelectron transport is controlled by the trapping/detrapping properties of surface states within the thin films. The slow photocurrent response upon the illumination can be explained by the trap saturation effect. For a TiO2 nanoparticulate thin film sensitized using CdS nanoparticles, the slow photocurrent response disappears and the steady-state photocurrent increases drastically, which suggests that photosensitization can decrease the effect of surface states on photocurrent response. Electronic Publication |
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| Keywords: | Surface photovoltage spectra Photoelectrochemistry Photosensitization TiO2 and CdS nanoparticles Thin film |
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