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Modification of ZnO Layers by Molecular Adsorbates During Electrochemical Deposition

Published online by Cambridge University Press:  01 February 2011

Thomas Loewenstein ,
Christian Neumann ,
Bruno K. Meyer ,
Tsukasa Yoshida  and
Derck Schlettwein
Thomas Loewenstein
Affiliation:
thomas.loewenstein@ap.physik.uni-giessen.de, Justus-Liebig-Universität Giessen, Institute of Applied Physics, Heinrich-Buff-Ring 16, Giessen D- 35392, Germany
Christian Neumann
Affiliation:
christian.neumann@exp1.physik.uni-giessen.de, Justus-Liebig-Universität Giessen, Institute of Experimental Physics 1, Heinrich-Buff-Ring 16, Giessen, D- 35392, Germany
Bruno K. Meyer
Affiliation:
bruno.k.meyer@exp1.physik.uni-giessen.de, Justus-Liebig-Universität Giessen, Institute of Experimental Physics 1, Heinrich-Buff-Ring 16, Giessen, D- 35392, Germany
Tsukasa Yoshida
Affiliation:
yoshida@apchem.gifu-u.ac.jp, Gifu University, Graduate School of Engineering, Yanagido 1-1, Gifu, 501-1193, Japan
Derck Schlettwein
Affiliation:
schlettwein@uni-giessen.de, Justus-Liebig-Universität Giessen, Institute of Applied Physics, Heinrich-Buff-Ring 16, Giessen, D- 35392, Germany
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Abstract

ZnO and ZnO/EosinY hybrid materials were electrodeposited from aqueous zinc salt solutions on (0001) GaN and on (0001) ZnO. Crystalline ZnO was deposited as proven by X-ray diffraction (XRD). The intensity pattern for ZnO/EosinY showed a preferential orientation with the c- plane of ZnO parallel to GaN (0001) or ZnO (0001). XRD rocking curves with FWHM=0.25° indicated a high level of in-plane orientation of the deposited ZnO crystalline domains. The peak position of (0002) ZnO was shifted by 2Θ=1.3°. This difference and the corresponding simultaneous shift of (0004) ZnO were explained by a lattice expansion by 3.6 % in the c- direction. This clearly indicated the strong influence of the Eosin Y molecules adsorbed during the electrodeposition of ZnO. Scanning electron microscopy (SEM) revealed the formation of domains with different crystal sizes pointing at a varying density of nucleation sites on the substrate.

Keywords

electrodepositionself-assemblyII-VI
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K05-05
Copyright
Copyright © Materials Research Society 2007

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