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Chemical Physics Letters

Publication date: 2007-06
Volume: 441 Pages: 115 - 118
ISSN: 0009-2614, 1873-4448
DOI: 10.1016/j.cplett.2007.04.089
Publisher: Elsevier

Author:

Zeng, Yujia
Ye, Z ; Lu, Y ; Lu, J ; Xu, W ; Zhao, B ; Che, Y

Keywords:

zinc-oxide, n-type, epitaxy, hydrogen, acceptor, Chemical Physics, 02 Physical Sciences, 03 Chemical Sciences, 10 Technology

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.