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Doping of Aigan Alloys

Published online by Cambridge University Press:  10 February 2011

Chris G. Van de Walle ,
C. Stampfl ,
J. Neugebauer ,
M. D. McCluskey  and
N. M. Johnson
Chris G. Van de Walle
Affiliation:
Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, CA 94304
C. Stampfl
Affiliation:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14 195 Berlin-Dahlem, Germany
J. Neugebauer
Affiliation:
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14 195 Berlin-Dahlem, Germany
M. D. McCluskey
Affiliation:
Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, CA 94304
N. M. Johnson
Affiliation:
Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, CA 94304
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Abstract

Nitride-based device structures for electronic and optoelectronic applications usually incorporate layers of AlxGal-xN, and n- and p-type doping of these alloys is typically required. Experimental results indicate that doping efficiencies in AlxGal-xN are lower than in GaN. We address the cause of these doping difficulties, based on results from first-principles density-functional-pseudopotential calculations. For n-type doping we will discuss doping with oxygen, the most common unintentional donor, and with silicon. For oxygen, a DX transition occurs which converts the shallow donor into a negatively charged deep level. We present experimental evidence that oxygen is a DX center in AlxGal-xN for x>∼0.3. For p-type doping, we find that compensation by nitrogen vacancies becomes increasingly important as the Al content is increased. We also find that the ionization energy of the Mg acceptor increases with alloy composition x. To address the limitations on p-type doping we have performed a comprehensive investigation of alternative acceptor impurities; none of the candidates exhibits characteristics that surpass those of Mg in all respects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 537: Symposium G – GaN and Related Alloys , 1998 , G10.4
Copyright
Copyright © Materials Research Society 1999

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