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2-D Theoretical Model for Current–Voltage Characteristics in AlGaN/GaN HEMT’s
Laboratoire de micro-optoélectronique et nanostructures, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
Laboratoire d’électronique et de microélectronique, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
Laboratoire de micro-optoélectronique et nanostructures, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
Laboratoire de micro-optoélectronique et nanostructures, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
- 1 Laboratoire de micro-optoélectronique et nanostructures, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
- 2 Laboratoire d’électronique et de microélectronique, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
- 3 Laboratoire de micro-optoélectronique et nanostructures, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
- 4 Laboratoire de micro-optoélectronique et nanostructures, Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
Journal of Modern Physics·Volume 03 (2012)·Pages 881–886·Published 14 August 2012·DOI10.4236/jmp.2012.38115
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Abstract
A threshold-voltage-based 2-D theoretical model for the Current–Voltage characteristics of the AlGaN/GaN high electron mobility transistors (HEMT’s) is developed. The present work proposes an improved charge-control model by employing the Robin boundary condition when introduced the solution of the 2-D Poisson’s equation in the density of charge depleted in the AlGaN layer. The dependence of 2-DEG sheet carrier concentration on the aluminum composition and AlGaN layer thickness has been investigated in detail. Current–voltage characteristics developed from the 2-DEG model in order to take into account the impact of gate lengths. The relation between the kink effect and existing deep centers has also been confirmed by using an electrical approach, which can allow to adjust some of electron transport parameters in order to optimize the output current.
KeywordsAlGaN/GaNHigh Electron Mobility TransistorsTwo-Dimensional Electron Gas Sheet Charge DensityCurrent–Voltage CharacteristicsKink Effect
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