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Title: On the origin of the two-dimensional electron gas at AlGaN/GaN heterojunctions and its influence on recessed-gate metal-insulator-semiconductor high electron mobility transistors

It is commonly accepted that interface states at the passivation surface of AlGaN/GaN heterostructures play an important role in the formation of the 2DEG density. Several interface state models are cited throughout literature, some with discrete levels, others with different kinds of distributions, or a combination of both. The purpose of this article is to compare the existing interface state models with both direct and indirect measurements of these interface states from literature (e.g., through the hysteresis of transfer characteristics of Metal-Insulator-Semiconductor High Electron Mobility Transistors (MISHEMTs) employing such an interface in the gate region) and Technology Computer Aided Design (TCAD) simulations of 2DEG densities as a function of the AlGaN thickness. The discrepancies between those measurements and TCAD simulations (also those commonly found in literature) are discussed. Then, an alternative model inspired by the Disorder Induced Gap State model for compound semiconductors is proposed. It is shown that defining a deep border trap inside the insulator can solve these discrepancies and that this alternative model can explain the origin of the two dimensional electron gas in combination with a high-quality interface that, by definition, has a low interface state density.
Authors:
 [1] ; ; ; ; ; ;  [2] ; ;  [2] ;  [3]
  1. Centre for Microsystems Technology (CMST), imec and Ghent University, Technologiepark 914a, 9052 Gent (Belgium)
  2. imec, Kapeldreef 75, 3001 Leuven (Belgium)
  3. (Belgium)
Publication Date:
OSTI Identifier:
22305773
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM COMPOUNDS; DISTRIBUTION; ELECTRON GAS; ELECTRON MOBILITY; FIELD EFFECT TRANSISTORS; GALLIUM NITRIDES; HETEROJUNCTIONS; HYSTERESIS; INTERFACES; METALS; MOSFET; PASSIVATION; SEMICONDUCTOR MATERIALS; SIMULATION; SURFACES; THICKNESS; TWO-DIMENSIONAL CALCULATIONS