Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (03): 274-278.doi: 10.3866/PKU.WHXB19950318

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The Effect of Modulated Surface Band Bending on Photovoltage Spectra

Ren Yan-Zhi, Yu Jian-Feng, Wu Tong-Hao, Wang De-Jun, Cui Yi   

  1. Department of Chemistry,Jilin University,Changchun 130023
  • Received:1994-01-21 Revised:1994-08-10 Published:1995-03-15
  • Contact: Yu Jian-Feng

Abstract:

The surface photovoltage spectra (SPS) of a series of samples BixPMo12Oy(x=2 ~ 9, y=43 ~ 64) were measured. It was found that with the increase of Bi/P molar ratio, SPS exhibits regular evolutions characteristic of modulated surface band bendings. Another experiment using the samples as catalysts in selective oxidation of propane showed that the Bi/P molar ratio influences the basic capacity of vacancies in the scheelite-type structure; and thus it influences the surface band bending. A simple model was presented to account for the effect of band bending on photovoltages due to bandgap and sub-bandgap illumination.

Key words: Surface photovoltage spectra, Surface band bending, Catalytic activity