Journal
THIN SOLID FILMS
Volume 515, Issue 24, Pages 8670-8673Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2007.04.013
Keywords
ZnO; luminescence; surface; oxygen vacancy; ab initio; DFT
Ask authors/readers for more resources
The luminescence spectrum of ZnO exhibits, besides a UV band-edge recombination line, a broad visible band around 2.2-2.4 eV whose origin has not been satisfactorily established. Recently, analysis of the luminescence of nanostructured materials with high surface-to-volume ratios has led some authors to suggest that the band could be related to surface states. This work presents a novel ab initio study of the most relevant ZnO surfaces and their intrinsic point defects. It reveals the existence of intragap surface states 0.5 eV above the valence band maximum. If additional bulk defect levels are considered, several bulk-to-surface transitions are compatible with the observed visible luminescence. (c) 2007 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available