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AlN/GaN Distributed Bragg Reflectors Grown via Metal Organic Vapor Phase Epitaxy using GaN Insertion Layers

Published online by Cambridge University Press:  21 February 2012

L. E. Rodak ,
J. Peacock ,
J. Justice  and
D. Korakakis
L. E. Rodak
Affiliation:
Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506
J. Peacock
Affiliation:
Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506
J. Justice
Affiliation:
Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506
D. Korakakis
Affiliation:
Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506
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Abstract

Distributed Bragg Reflectors (DBRs) are an important component of various optoelectronic devices for ultra violet and visible wavelengths. In the III-Nitride material system, Aluminum Nitride (AlN) and Gallium Nitride (GaN) offer a large contrast in refractive index and are therefore well suited for fabricating DBRs with high reflectivity and wide bandwidths using relatively few periods. However, the large lattice and thermal mismatch leads to cracking in these heterostructures. In this work short period superlattice layers have been used to fabricate high reflectivity (> 94%) nitride based DBRs via Metal Organic Vapor Phase Epitaxy. Short period AlN/GaN superlattices containing three to four monolayers of GaN have been employed as the low refractive index layer in DBRs to minimize cracking. Using this technique, crack-free DBRs reflecting from 440-475 nm with up to 25 periods have been fabricated. The technique has been proven to be versatile and resulted in large area yield DBRs grown on a variety of different sapphire substrates.

Keywords

III-Vmetalorganic depositionoptoelectronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1396: Symposium O – Compound Semiconductors for Generating, Emitting and Manipulating Energy , 2012 , mrsf11-1396-o05-11
Copyright
Copyright © Materials Research Society 2012

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References

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