Relationship between photodesorption and surface conductivity in ZnO

Y. Shapira, R. B. McQuistan, David Lichtman

Research output: Contribution to journalArticlepeer-review

Abstract

We report measurements of CO2 photodesorption and associated surface-conductivity changes in ZnO. The measurements show a one-to-one correspondence between the rates of those two quantities. The rates of both CO2 photodesorption and surface-conductivity changes are initially fast, becoming much slower with illumination time. A calculation, based on the assumption that this time rate of change is related to a change in the degree of band bending during photodesorption, shows excellent agreement with the experimental results. This model is further supported by Auger-electron-spectroscopy measurements. The cross section for photodesorption is estimated to be ∼ 10-17 cm2.

Original languageEnglish
Pages (from-to)2163-2169
Number of pages7
JournalPhysical Review B-Condensed Matter
Volume15
Issue number4
DOIs
StatePublished - 1977
Externally publishedYes

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