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Changes in Electrical Characteristics of ZnO Thin Films Due to Environmental Factors

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The impact of light and controlled gas ambient on the electrical characteristics of ZnO:P grown by pulsed laser deposition (PLD) is investigated with temperature-dependent Hall-effect and photo-Hall-effect using above-bandgap light. Exposure to blue/ultraviolet (UV) light results in long-lived persistent photoconductivity (PPC) effects dominated by electron conduction. However, these persistent effects can be largely reversed by exposing the sample to a controlled ambient of dry O2 gas. These O2-induced changes in the electronic properties persist in vacuum up to at least 400 K. Exposure to dry N2 gas following blue/UV light has no effect on the observed PPC characteristics. The implications of these effects on the preparation of p-type ZnO will be discussed.

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Acknowledgements

We thank T.A. Cooper and W. Rice for technical assistance. Support for BC and DCL has been provided by AFOSR (D. Silversmith) and ARO (M. Gerhold).

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Authors and Affiliations

  1. Materials and Manufacturing Directorate, AFRL/MLPS, WPAFB, Dayton, OH, 45433, USA

    B. Claflin & D. C. Look

  2. Semiconductor Research Center, Wright State University, Dayton, OH, 45435, USA

    B. Claflin & D. C. Look

  3. Department of Materials Science & Engineering, University of Florida, Gainesville, FL, 32611, USA

    D. R. Norton

Authors
  1. B. Claflin
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  2. D. C. Look
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  3. D. R. Norton
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Correspondence to B. Claflin.

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Claflin, B., Look, D.C. & Norton, D.R. Changes in Electrical Characteristics of ZnO Thin Films Due to Environmental Factors. J. Electron. Mater. 36, 442–445 (2007). https://doi.org/10.1007/s11664-006-0063-7

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  • DOI: https://doi.org/10.1007/s11664-006-0063-7

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