Abstract
We report a combined temperature programmed desorption and Auger electron spectroscopy study of Zn and ZnO thin films on Cu, Cu 2O, and CuO surfaces. Multilayer Zn films desorb at 500 K with a pre-exponential factor of 10 12 s −1 and a desorption energy of 32 kcal mol , in excellent agreement with the heat of sublimation of bulk Zn metal. The bottommost layer of Zn atoms has a desorption energy that is 6 kcal mol larger, which is consistent with the heat of formation of dilute Cu Zn alloys. Films converted to ZnO by oxidation in air decompose with an apparent activation energy of 45 kcal mol , which is substantially smaller than the decomposition energy of bulk ZnO. Thin ZnO films can also be formed by evaporating multilayer coverages of Zn onto CuO or Cu 2O and then heating. When CuO is used as the substrate, the Zn film is oxidized by O atoms produced by the reduction of CuO to Cu 2O. When Cu 2O is used as the substrate, ZnO is produced by the reduction of Cu 2O to Cu, which migrates to the surface of the ZnO film.
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