Journal of Electronic Materials

, Volume 36, Issue 4, pp 442–445

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

Special Issue Paper

DOI: 10.1007/s11664-006-0063-7

Cite this article as:
Claflin, B., Look, D.C. & Norton, D.R. Journal of Elec Materi (2007) 36: 442. doi:10.1007/s11664-006-0063-7

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.

Keywords

p-type ZnOphoto-Hall-effectpersistent photoconductivity (PPC)mixed conductionsemiconducting II-VI materialszinc oxide

Copyright information

© TMS 2007

Authors and Affiliations

  1. 1.Materials and Manufacturing DirectorateAFRL/MLPS, WPAFBDaytonUSA
  2. 2.Semiconductor Research CenterWright State UniversityDaytonUSA
  3. 3.Department of Materials Science & EngineeringUniversity of FloridaGainesvilleUSA