Author:

Keywords:

zinc-oxide, n-type, epitaxy, hydrogen, acceptor, Science & Technology, Physical Sciences, Chemistry, Physical, Physics, Atomic, Molecular & Chemical, Chemistry, Physics, ZINC-OXIDE, N-TYPE, EPITAXY, HYDROGEN, ACCEPTOR, 02 Physical Sciences, 03 Chemical Sciences, 10 Technology, Chemical Physics, 34 Chemical sciences, 51 Physical sciences

Abstract:

The authors report on comparative study on ultraviolet (UV) photoconductivity of p-type ZnO:N films and n-type ZnO epilayer. As compared with the ZnO epilayer, the ZnO:N films show much higher photoconductivity but with faster decay. Surface adsorption of C and O, as identified by X-ray photoelectron spectroscopy, is believed to be a major contribution to the UV photoconductivity. The surface adsorption and photodesorption process, combined with a competition between holes and electrons, in p-type ZnO:N, is proposed tentatively, providing qualitative agreement with the observed behaviors. (C) 2007 Elsevier B.V. All rights reserved.