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Undoped and doped GaN thin films deposited on high-temperature monocrystalline AlN buffer layers on vicinal and on-axis α(6H)–SiC(0001) substrates via organometallic vapor phase epitaxy

Published online by Cambridge University Press:  31 January 2011

T. Warren Weeks Jr. ,
Michael D. Bremser ,
K. Shawn Ailey ,
Eric Carlson ,
William G. Perry ,
Edwin L. Piner ,
Nadia A. El-Masry  and
Robert F. Davis
T. Warren Weeks Jr.
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
Michael D. Bremser
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
K. Shawn Ailey
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
Eric Carlson
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
William G. Perry
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
Edwin L. Piner
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
Nadia A. El-Masry
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
Robert F. Davis
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Box 7907, Raleigh, North Carolina 27695–7907
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Abstract

Monocrystalline GaN(0001) thin films have been grown at 950 °C on high-temperature, ≈ 100 nm thick, monocrystalline AlN(0001) buffer layers predeposited at 1100 °C on α(6H)−SiC(0001)Si substrates via OMVPE in a cold-wall, vertical, pancake-style reactor. These films were free of low-angle grain boundaries and the associated oriented domain microstructure. The PL spectra of the GaN films deposited on both vicinal and on-axis substrates revealed strong bound excitonic emission with a FWHM value of 4 meV. The near band-edge emission from films on the vicinal substrates was shifted slightly to a lower energy, indicative of films containing residual tensile stresses. A peak attributed to free excitonic emission was also clearly observed in the on-axis spectrum. Undoped films were too resistive for accurate Hall-effect measurements. Controlled n-type, Si-doping in GaN was achieved for net carrier concentrations ranging from approximately 1 × 1017 cm−3 to 1 × 1020 cm−3. Mg-doped, p-type GaN was achieved with nA−nD ≈ 3 × 1017 cm−3, ρ ≈ 7 Ω · cm, and μ ≈ 3 cm2/V · s. Double-crystal x-ray rocking curve measurements for simultaneously deposited 1.4 μm GaN films revealed FWHM values of 58 and 151 arcsec for deposition on on-axis and off-axis 6H−SiC(0001)Si substrates, respectively. The corresponding FWHM values for the AlN buffer layers were approximately 200 and 400 arcsec, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 4 , April 1996 , pp. 1011 - 1018
Copyright
Copyright © Materials Research Society 1996

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