Oliver Schmidt, Arnd Geis, Peter Kiesel, Chris. G. Van de Walle, Noble M. Johnson, Andrey Bakin, Andreas Waag, Gottfried H. Döhler
AbstractThe electrical properties of high-resistivity zinc oxide (ZnO) bulk and epi-samples are strongly influenced by the sample ambient. Bulk samples that are highly resistive in ambient air can be reversibly transformed into a high conducting state under vacuum. As an explanation we suggest a conducting electron channel at the ZnO surface. Under vacuum this channel appears upon annealing. Exposure to ambient air destroys the channel. The channel is evident only for samples showing a high bulk resistivity, …
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