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KMID : 1059519840280040251
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Journal of the Korean Chemical Society
1984 Volume.28 No. 4 p.251 ~ p.258
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Surface Photovoltage Spectroscopy on Dyed Zinc Oxide
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Kim Young-Soon
Sung Yong-Kiel
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Abstract
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The mechanism of photosensitization and the effect of binder on dye-sensitized ZnO have been studied by surface photovoltage spectroscopy. It has been found that the value of energy trapping level Et1 on ZnO is 1.12eV (λ = 1,100nm) and that of energy trapping level Et2 on dye-sensitized ZnO is 0.99eV (λ = 1,250nm) which is shifted towards a longer wavelength. The effect of binder on ZnO has been increased the efficiency of surface photovoltage, but it does not effect the values of energy trapping level. The acid-type dyes agree well with the prediction based on an electron transfer mechanism. The desensitization of the Na salt-type dyes for the intrinsic photoresponse of zinc oxide can be explained by energy transfer mechanism. It has been obtained that the dye-sensitized ZnO indicates the possibility of electrophotographic photosensitizer for the infrared range of light.
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