Compositional origin of surface roughness variations in air-annealed ZnO single crystals

We directly investigated the chemical compositional origin of surface roughness variations in air-annealed ZnO single crystal samples for annealing temperatures up to 1000 °C. Atomic Force Microscopy (AFM) showed temperature-dependent changes in surface roughness and morphology, with a maximum in su...

Full description

Saved in:
Bibliographic Details
Published in:Applied surface science 2008-02, Vol.254 (8), p.2220-2223
Main Authors: Elizabeth Pugel, D., Vispute, R.D., Hullavarad, S.S., Venkatesan, T., Varughese, B.
Format: Article
Language:English
Subjects:
Air-annealing
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Physics
Single crystal
Surface morphology
ZnO
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We directly investigated the chemical compositional origin of surface roughness variations in air-annealed ZnO single crystal samples for annealing temperatures up to 1000 °C. Atomic Force Microscopy (AFM) showed temperature-dependent changes in surface roughness and morphology, with a maximum in surface roughness of 2 nm found for samples annealed at 400 °C. The O(1s) line, measured by X-ray Photoelectron Spectroscopy (XPS) showed a maximum for Zn(OH) 2 and a minimum for off-stoichiometric ZnO at 400 °C; while the Zn(2p) peaks show an increase in slope at that temperature. These results indicate that the roughness arises from Zn diffusion and loss of surface oxygen.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2007.07.206