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Growth of GaN on Lithium Gallate Substrates for Development of a GaN Thin Compliant Substrate

Published online by Cambridge University Press:  10 February 2011

W. A. Doolittle ,
T. Kropewnicki ,
C. Carter-Coman ,
S. Stock ,
P. Kohl ,
N. M. Jokerst ,
R. A. Metzger ,
S. Kang ,
K. Lee  and
G. May
...Show all authors
W. A. Doolittle
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
T. Kropewnicki
Affiliation:
Georgia Institute of Technology, School of Chemical Eng., Atlanta, GA 30332-0100
C. Carter-Coman
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
S. Stock
Affiliation:
Georgia Institute of Technology, School of Materials Science and Eng., Atlanta, GA 30332-0245
P. Kohl
Affiliation:
Georgia Institute of Technology, School of Chemical Eng., Atlanta, GA 30332-0100
N. M. Jokerst
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
R. A. Metzger
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
S. Kang
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
K. Lee
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
G. May
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
A. S. Brown
Affiliation:
Georgia Institute of Technology, School of Electrical and Computer Eng., Atlanta, GA 30332-0250 [email protected]
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Abstract

The GaN on LGO system is the near perfect template (due to extremely high etch selectivity) for developing a viable thin film/compliant GaN substrate. Herein, we report on our efforts to grow GaN on LGO, including improvement of the microscopic surface morphology using pre-growthpretreatments. We also report on the first transferred thin film GaN substrate grown on LGO, transferred off of LGO, and mounted on GaAs. With this approach, (InAl)GaN alloys can be grown on thin GaN films, implementing a truly “compliant” substrate for the nitride alloy system. In addition, the flexibility of bonding to low cost Si, metal or standard ceramic IC packages is an attractive alternative to SiC and HVPE GaN substrates for optimizing cost verses thermal conductivity concerns. We have demonstratedhigh quality growth of GaN on LGO. X-Ray rocking curves of 145 arc-seconds are obtained with only a 0.28 μm thick film. We present data on the out of plane crystalline quality of GaN/LGO material. Likewise, we show 2 orders of magnitude improvement in residual doping concentration and factors of 4 improvement in electron mobility as compared to the only previously reported electrical data. We show substantial vendor to vendor and intra-vendor LGO material quality variations. We have also quantified the desorption of Ga and Li from the surface of LGO at typical growth temperatures using in situ desorption mass spectroscopy and XPS.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 482 , 1997 , 283
Copyright
Copyright © Materials Research Society 1998

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