Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Effect of Oxygen Adsorption on the Depth of Space Charge Region on ZnO $(10{\bar{1}}0)$

  • Han, Chong-Soo (Department of Chemistry, Chonnam National University) ;
  • Jun, Jin (Department of Chemistry, Chonnam National University) ;
  • Chon, Hak-Ze (Korea Advanced Institute of Science and Technology)
  • Published : 1992.02.20
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Abstract

The apparent depth of space charge region on the ZnO $(10{\bar{1}}0)$ surface in chemisorption of oxygen has been estimated from the capacitance of two contacting faces. When the sample (donor concentration: $2.4{\times}10^{22}\;m^{-3}$) was evacuated at 773 K for 1 hr the depth reached to 40-100 ${\AA}$ depending on sample assembly. Admission of oxygen to the sample resulted in an increase of the depth to 3600 ${\AA}$ where the increment was greater at higher oxygen pressure between 6.6-1600 $N/m^2$. Admission of CO to the sample previously exposed to oxygen yields a decrease in the depth. The results of the measurement support that oxygen is adsorbed as an acceptor on ZnO $(10{\bar{1}}0)$.

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Cited by

  1. I-V Characteristics of ZnO−ZnO contact during oxygen adsorption vol.57, pp.2, 1992, https://doi.org/10.1007/bf02064739