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Growth of High Quality (In,Ga,Al)N/GaN Heterostructure Materials and Devices by Atmospheric Pressure MOCVD

Published online by Cambridge University Press:  15 February 2011

S. P. Denbaars ,
S. Keller ,
B. P. Keller ,
Y. F. Wu ,
D. Kapolnek  and
U. K. Mishra
S. P. Denbaars
Affiliation:
Materials Departments, University of California, Santa Barbara, CA 93106, U.S.A.
S. Keller
Affiliation:
Electrical & Computer Engineering University of California, Santa Barbara, CA 93106, U.S.A.
B. P. Keller
Affiliation:
Electrical & Computer Engineering University of California, Santa Barbara, CA 93106, U.S.A.
Y. F. Wu
Affiliation:
Electrical & Computer Engineering University of California, Santa Barbara, CA 93106, U.S.A.
D. Kapolnek
Affiliation:
Materials Departments, University of California, Santa Barbara, CA 93106, U.S.A.
U. K. Mishra
Affiliation:
Electrical & Computer Engineering University of California, Santa Barbara, CA 93106, U.S.A.
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Abstract

Using atmospheric pressure MOCVD we have obtained high quality InGaN/GaN and AlGaN/GaN heterostructure materials and devices. For nominally undoped 4 μm thick GaN films, we obtained 300 K mobilities of 780 cm2/Vs and an unintentional background impurity level of n300K = 6*1016 cm−3. For InGaN/GaN heterostructures we have obtained direct band-edge transitions with FWHM as narrow as 7.9 nm (59 meV) for 50Å thick In0.16Ga0.84N quantum wells at 300K, which is the among the best reported values. The quantum wells display energy shifts towards shorter wavelength with decreasing well thickness, and the shift agrees with predicted quantum effects. These materials have been incorporated into InGaN single quantum well LEDs that emit at 450 nm. In addition AlGaN/GaN heterostructure materials have been incorporated into HFETs and MODFETs. Gate-drain breakdown voltage well exceeding 100 V, and extrinsic transconductance gm of up to 140 mS/mm were realized in the MODFET.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 423: Symposium E – III-Nitride, SiC, and Diamond Materials for Electronic , 1996 , 23
Copyright
Copyright © Materials Research Society 1996

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