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Title: Enhancement Of Free Exciton Peak Intensity In Reactively Sputtered ZnO Thin Films On (0001) Al2O3

Abstract

Wide bandgap materials such as GaN with its direct bandgap structure have been developed rapidly for applications in short wavelength light emission. ZnO, II-VI oxide semiconductor, is also promising for various technological applications, especially for optoelectronic light emitting devices in the visible and ultraviolet (UV) range of the electromagnetic spectrum. Above-band-edge absorption spectra of reactively sputtered Zn- and O-rich samples exhibit free exciton (FX) and neutral acceptor bound exciton (A deg. X) features. It is shown that the residual acceptors which bind excitons with an energy of 75 meV reside about 312 meV above the valence band, according to effective mass theory. An intra-bandgap absorption feature peaking at 2.5 eV shows correlation with the characteristically narrow A-free exciton peak intensity. Relevant annealing processes are presented as a function of time and temperature dependently for both Zn- and O- rich thin films. Enhancement of the free exciton peak intensity is observed without disturbing the residual shallow acceptor profile which is necessary for at least background p-type conductivity.

Authors:
; ; ; ;  [1];  [2]
  1. Department of Physics, Faculty of Arts and Sciences, Atatuerk University, 25240 Erzurum (Turkey)
  2. (United States)
Publication Date:
OSTI Identifier:
21057146
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 899; Journal Issue: 1; Conference: 6. international conference of the Balkan Physical Union, Istanbul (Turkey), 22-26 Aug 2006; Other Information: DOI: 10.1063/1.2733149; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ABSORPTION SPECTRA; ANNEALING; CORRELATIONS; EFFECTIVE MASS; ELECTRIC CONDUCTIVITY; ENERGY GAP; EV RANGE; EXCITONS; GALLIUM NITRIDES; SEMICONDUCTOR MATERIALS; SPUTTERING; TEMPERATURE DEPENDENCE; THIN FILMS; TIME DEPENDENCE; ULTRAVIOLET RADIATION; VALENCE; WAVELENGTHS; ZINC OXIDES

Citation Formats

Tuezemen, S., Guer, Emre, Yildirim, T., Xiong, G., Williams, R. T., and Department of Physics, Wake Forest University, Winston-Salem, NC 27109. Enhancement Of Free Exciton Peak Intensity In Reactively Sputtered ZnO Thin Films On (0001) Al2O3. United States: N. p., 2007. Web. doi:10.1063/1.2733149.
Tuezemen, S., Guer, Emre, Yildirim, T., Xiong, G., Williams, R. T., & Department of Physics, Wake Forest University, Winston-Salem, NC 27109. Enhancement Of Free Exciton Peak Intensity In Reactively Sputtered ZnO Thin Films On (0001) Al2O3. United States. doi:10.1063/1.2733149.
Tuezemen, S., Guer, Emre, Yildirim, T., Xiong, G., Williams, R. T., and Department of Physics, Wake Forest University, Winston-Salem, NC 27109. Mon . "Enhancement Of Free Exciton Peak Intensity In Reactively Sputtered ZnO Thin Films On (0001) Al2O3". United States. doi:10.1063/1.2733149.
@article{osti_21057146,
title = {Enhancement Of Free Exciton Peak Intensity In Reactively Sputtered ZnO Thin Films On (0001) Al2O3},
author = {Tuezemen, S. and Guer, Emre and Yildirim, T. and Xiong, G. and Williams, R. T. and Department of Physics, Wake Forest University, Winston-Salem, NC 27109},
abstractNote = {Wide bandgap materials such as GaN with its direct bandgap structure have been developed rapidly for applications in short wavelength light emission. ZnO, II-VI oxide semiconductor, is also promising for various technological applications, especially for optoelectronic light emitting devices in the visible and ultraviolet (UV) range of the electromagnetic spectrum. Above-band-edge absorption spectra of reactively sputtered Zn- and O-rich samples exhibit free exciton (FX) and neutral acceptor bound exciton (A deg. X) features. It is shown that the residual acceptors which bind excitons with an energy of 75 meV reside about 312 meV above the valence band, according to effective mass theory. An intra-bandgap absorption feature peaking at 2.5 eV shows correlation with the characteristically narrow A-free exciton peak intensity. Relevant annealing processes are presented as a function of time and temperature dependently for both Zn- and O- rich thin films. Enhancement of the free exciton peak intensity is observed without disturbing the residual shallow acceptor profile which is necessary for at least background p-type conductivity.},
doi = {10.1063/1.2733149},
journal = {AIP Conference Proceedings},
number = 1,
volume = 899,
place = {United States},
year = {Mon Apr 23 00:00:00 EDT 2007},
month = {Mon Apr 23 00:00:00 EDT 2007}
}