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High-Temperature Electron Transport Properties in AlGaN/GaN Heterostructure Field Effect Transistors

Published online by Cambridge University Press:  17 March 2011

Narihiko Maeda ,
Tadashi Saitoh ,
Kotaro Tsubaki ,
Toshio Nishida  and
Naoki Kobayashi
Narihiko Maeda
Affiliation:
NTT Basic Research Laboratories, Physical Science Laboratory, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-0198, Japan
Tadashi Saitoh
Affiliation:
NTT Basic Research Laboratories, Physical Science Laboratory, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-0198, Japan
Kotaro Tsubaki
Affiliation:
NTT Basic Research Laboratories, Physical Science Laboratory, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-0198, Japan
Toshio Nishida
Affiliation:
NTT Basic Research Laboratories, Physical Science Laboratory, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-0198, Japan
Naoki Kobayashi
Affiliation:
NTT Basic Research Laboratories, Physical Science Laboratory, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa, 243-0198, Japan
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Abstract

Electron transport properties in the Al0.15Ga0.85N/GaN heterostructure field effect transistors (HFETs) have been examined from room temperature up to 400°C. The temperature dependencies of the two-dimensional electron gas (2DEG) mobility have been systematically measured for the samples with different 2DEG densities. The 2DEG mobility has decreased with increasing the temperature, however, its decrease ratio has been no longer large above 300°C. Moreover, the 2DEG mobility has found to be less dependent on the 2DEG density at higher temperatures. These observed features indicate that the 2DEG mobility above room temperature is limited by longitudinal optical (LO) phonon scattering, as is expected by theoretical prediction. The observed 2DEG mobilities at 400°C were as high as from 100 to 120 cm2/Vs, directly providing the evidence for suitability of the HFET of this material system for high-temperature applications. The temperature dependence of the transconductance (gm) of a HFET device has also been examined up to 400°C. It has been revealed that the temperature dependence of gm has basically the same features as those of the 2DEG mobility in the corresponding temperature region.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 639: Symposium G – GaN and Related Alloys-2000 , 2000 , G11.14
Copyright
Copyright © Materials Research Society 2001

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References

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