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Structural Defect-Related Photoluminescence in GaN

Published online by Cambridge University Press:  01 February 2011

L. Chen
Affiliation:
Department of Electrical Engineering and Center for Solid State Electronics Research, Arizona State University, Tempe, AZ, 85287–5706, U.S.A.
B. J. Skromme
Affiliation:
Department of Electrical Engineering and Center for Solid State Electronics Research, Arizona State University, Tempe, AZ, 85287–5706, U.S.A.
M. K. Mikhov
Affiliation:
Department of Electrical Engineering and Center for Solid State Electronics Research, Arizona State University, Tempe, AZ, 85287–5706, U.S.A.
H. Yamane
Affiliation:
Tohoku University, Sendai 980–8577, Japan
M. Aoki
Affiliation:
Tohoku University, Sendai 980–8577, Japan
F. J. DiSalvo
Affiliation:
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, U.S.A.
B. Wagner
Affiliation:
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, U.S.A.
R. F. Davis
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695–7907, U.S.A.
P. A. Grudowski
Affiliation:
Microelectronics Research Center, University of Texas, Austin, TX 78712–1100, U.S.A.
R. D. Dupuis
Affiliation:
Microelectronics Research Center, University of Texas, Austin, TX 78712–1100, U.S.A.
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Abstract

Broad, low temperature photoluminescence (PL) peaks near 3.4–3.42 eV in GaN have previously been associated with basal-plane stacking faults. Recently, we observed unusually sharp and highly structured PL peaks in this region in high quality bulk GaN grown from a Na/Ga flux, some of which display characteristic shifts and narrowing as a function of excitation power. Here, we study these peaks as a function of excitation intensity and crystal polarity, and compare them to those observed in GaN grown on off-axis SiC or sapphire (0001) substrates by metalorganic chemical vapor deposition (MOCVD). In the off-axis material on either substrate, similar peaks are observed to those in the bulk samples. In addition, a low energy peak near 3.21 eV is observed, which does not occur in the bulk material.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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