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Structural and Optical Property Investigations on Mg-Alloying in Epitaxial Zinc Oxide Films on Sapphire

Published online by Cambridge University Press:  03 September 2012

A.K. Sharma ,
C. Jin ,
A. Kvit ,
J. Narayan ,
J.F. Muth ,
C.W. Teng ,
R.M. Kolbas  and
O.W. Holland
A.K. Sharma
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7916
C. Jin
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7916
A. Kvit
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7916
J. Narayan
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7916
J.F. Muth
Affiliation:
Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695-7911
C.W. Teng
Affiliation:
Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695-7911
R.M. Kolbas
Affiliation:
Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695-7911
O.W. Holland
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge TN, 37831-6048
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Abstract

We have synthesized single-crystal epitaxial MgZnO films by pulsed-laser deposition. High-resolution transmission electron microscopy, X-ray diffraction and Rutherford backscattering spectroscopy/ion channeling were used to characterize the microstructure, defect content, composition and epitaxial single-crystal quality of the films. In these films with up to ∼ 34 atomic percent Mg incorporation, an intense ultraviolet band edge photoluminescence at room temperature and 77 K was observed. The highly efficient photoluminescence is indicative of the excitonic nature of the material. Transmission spectroscopy revealed that the excitonic structure of the alloys was clearly visible at room temperature. Post-deposition annealing in oxygen reduced the number of defects and improved the optical properties of the films. The potential applications of MgZnO alloys in a variety of optoelectronic devices are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 595: Symposium W – GaN and Related Alloys - 1999 , 1999 , F99W3.87
Copyright
Copyright © Materials Research Society 1999

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