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An Analytical Compact Direct-Current and Capacitance Model for AlGaN/GaN High Electron Mobility Transistors

Published online by Cambridge University Press:  01 February 2011

Miao Li ,
Xiaoxu Cheng  and
Yan Wang
Miao Li
Affiliation:
[email protected], Institute of Microelectronics, Institute of Microelectronics, Institute of Microelectronics, Tsinghua Univ., Beijing, 100084, China, People's Republic of, 86-10-62772373, 86-10-62771130
Xiaoxu Cheng
Affiliation:
[email protected], Institute of Microelectronics, Institute of Microelectronics, Tsinghua Univ., Beijing, 100084, China, People's Republic of
Yan Wang
Affiliation:
[email protected], Institute of Microelectronics, Institute of Microelectronics, Tsinghua Univ., Beijing, 100084, China, People's Republic of
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Abstract

We develop an analytical model for the Direct-Current (DC) and capacitance-voltage (CV) characteristics of AlGaN/GaN High Electron Mobility Transistors (HEMTs), providing accurate predictions of the transconductance and the gate capacitance in both linear and velocity saturation regions. The models provide an accurate and smooth connection in the area near the knee point for the DC characteristics, which is attributed to precise descriptions of the channel charge. An accurate model for the low-field mobility of the two dimensional electron gases (2DEG) has been developed, considering the nonmonotonic dependence of the carrier velocity on the electric field perpendicular to the channel for the first time. The calculated transconductance and output conductance are proved accurate and to have high order continuity, especially in large voltage biases, which is hard for some other analytical or numeral models. The gate capacitance has been obtained analytically and verified by experimental data. The slight decrease in the measured gate-to-source capacitance over the velocity saturation region which indicates the results of neutralization of donors and the contribution of the free electron in the AlGaN layer has been modeled accurately and smoothly for the first time. The predicted cut-off frequency is in excellent agreements with measured data over the full range of applied biases. The models are implemented into the HSPICE simulator for the DC, AC and transient simulations, with good speed and convergence characteristics.

Keywords

III-Velectrical propertiesnitride
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1068: Symposium C – Advances in GaN, GaAs, SiC and Related Alloys on Silicon Substrates , 2008 , 1068-C03-17
Copyright
Copyright © Materials Research Society 2008

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References

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