Table of Contents
ISRN Condensed Matter Physics
Volume 2012 (2012), Article ID 950354, 6 pages
http://dx.doi.org/10.5402/2012/950354
Research Article

Photoluminescence of Zinc Oxide Nanowires: The Effect of Surface Band Bending

Department of Physics, Furman University, Greenville, SC 29613, USA

Received 4 January 2012; Accepted 29 January 2012

Academic Editors: J. Brault, H. Hibino, and V. Kochereshko

Copyright © 2012 Dake Wang and Nicholas Reynolds. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The photoluminescence of zinc oxide nanowires was investigated via the thermal annealing treatment in oxygen-rich and oxygen-poor conditions. Dramatic changes in the relative intensity of the ultraviolet and the green visible luminescence were observed following different annealing treatments. The changes in photoluminescence bear little correlation to the changes in the oxygen-to-zinc ratios that were revealed using Raman scattering and other characterization techniques. The chemisorption of oxygen and the subsequent surface band bending, instead of the oxygen vacancy concentration, are shown to be the mechanism that determines the observed changes in photoluminescence.