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Proceedings Paper

High temperature performance measurement and analysis of GaN HEMTs
Author(s): B. A. Polash; M. A. Huque; S. K. Islam; H. Huq
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Paper Abstract

Objective of this paper is to evaluate the performance of GaN HEMTs for high temperature applications. A sample AlGaN/GaN HEMT structure is investigated using empirical data to evaluate the device performance at high temperatures. Input transfer and output characteristics are the key focus along with transconductance and saturation current. Intrinsic device parameters were calculated using measured S-parameter data at various frequencies under different bias conditions and temperatures. Transconductance found at 398 °K is 2.5 mS for the entire gate width. DC characteristics of the fabricated devices were examined at temperatures ranging from 295 °K to 363 °K. Maximum drain current measured at room temperature was 214 mA which reduced to 192 mA at 363 °K. Reduction in saturation drain current is found due to decrease in saturation carrier velocity and two dimensional electron density. Structure based simulation tool ATLAS from Silvaco Int. is used for numerical simulations. The simulated device performance is in good agreement with the empirical results. Experimental results for the critical parameters suggest that the device can operate in the GHz Range for temperature up to 600 °K. Further enhancement of the model device is suggested upon reviewing the measured results to improve the high-temperature performance.

Paper Details

Date Published: 28 February 2008
PDF: 9 pages
Proc. SPIE 6894, Gallium Nitride Materials and Devices III, 68941J (28 February 2008); doi: 10.1117/12.764255
Show Author Affiliations
B. A. Polash, The Univ. of Texas-Pan American (United States)
M. A. Huque, Univ. of Tennessee (United States)
S. K. Islam, Univ. of Tennessee (United States)
H. Huq, The Univ. of Texas-Pan American (United States)

Published in SPIE Proceedings Vol. 6894:
Gallium Nitride Materials and Devices III
Hadis Morkoç; Cole W. Litton; Jen-Inn Chyi; Yasushi Nanishi; Euijoon Yoon, Editor(s)

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