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Jpn. J. Appl. Phys. 44 (2005) pp. 7271-7274  |Previous Article| |Next Article|  |Table of Contents|
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Selected Topics in Applied Physics

Physics of UV Materials and Devices and Their Applications

Effects of an Electrically Conducting Layer at the Zinc Oxide Surface

Oliver Schmidt¹, Peter Kiesel¹, Chris G. Van de Walle^1,2, Noble M. Johnson¹, Jeff Nause³ and Gottfried H. Döhler⁴

¹Palo Alto Research Center Inc., 3333 Coyote Hill Road, Palo Alto, CA 94304, U.S.A.
²University of California, Materials Department, Santa Barbara, CA 93106, U.S.A.
³Cermet Inc., 1019 Collier Road, Atlanta, GA 30318, U.S.A.
⁴Universität Erlangen Nürnberg, Institut für Technische Physik 1, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany

(Received March 22, 2005; accepted May 28, 2005; published October 11, 2005)

Measurements of the electrical properties of high-resistivity zinc oxide (ZnO) are strongly influenced by the sample ambient. Temperature-dependent Hall-effect measurements were performed on Li- and Cu-doped bulk crystals in both air and vacuum. Repeating the measurements under a given test ambient produced stable results. Changing the ambient systematically changed the measured results. We explain this behavior in terms of a surface conducting channel that exists in vacuum but is destroyed upon exposure to air. We propose that the surface conducting layer is eliminated in air due to changes of the surface condition. This feature of the untreated ZnO surface may relate to reports of large scatter and poor reproducibility of electrical data on p-type ZnO samples.

URL: http://jjap.jsap.jp/link?JJAP/44/7271/
DOI: 10.1143/JJAP.44.7271

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