http://dx.doi.org/10.1016/j.apsusc.2013.01.160">
 

Document Type

Journal Article

Department/Unit

Institute of Computational and Theoretical Studies

Title

Green emission in ZnO nanostructures - Examination of the roles of oxygen and zinc vacancies

Language

English

Abstract

Green defect emission is commonly observed in ZnO nanostructures. It is frequently attributed to oxygen vacancies and used to evaluate performance and study physical mechanisms in a variety of applications, such as gas sensing and photocatalysis. However, competing hypotheses have been proposed to explain green emission, which raises questions about the role of oxygen vacancies in sensing and photocatalytic processes. The major problem in correct experimental identification of defects in ZnO is the abundance of defects present, while theoretically there are problems with accurate calculation of a defect energy level in the gap. Thus, here we adopted a different approach and studied experimentally and theoretically the interaction of ZnO with different chemical substances (hydrogen and a silane-based molecule). Based on theoretical predictions and experimental results, we can conclude that green emission can likely be assigned to defect complexes, which may contain zinc vacancies. © 2013 Elsevier B.V.

Keywords

Green emission, Nanostructures, Photoluminescence, ZnO

Publication Date

2013

Source Publication Title

Applied Surface Science

Volume

271

Start Page

202

End Page

209

Publisher

Elsevier

ISSN (print)

01694332

This document is currently not available here.

Share

COinS