Impact of Gate Metal on Surface States Distribution and Effective Surface Barrier Height in AlGaN/GaN Heterostructures

2013 ◽  
Vol 1538 ◽  
pp. 335-340 ◽  
Author(s):  
Nitin Goyal ◽  
Tor A. Fjeldly
Keyword(s):  
Barrier Height ◽  
Surface States ◽  
Surface Barrier ◽  
Metal Gate ◽  
Effective Surface ◽  
Barrier Layers ◽  
Donor Density ◽  
Model Predictions ◽  
Surface Donor ◽  
Bare Surface

ABSTRACTA physics based model is presented to describe the surface donor density distribution for metal/AlGaN/GaN structures. This model partly relies on experimental observations to describe the reduction that takes place in surface donor density when the metal gate is deposited. This new model is based on our previous work on the bare surface barrier height for both unrelaxed and partially relaxed barrier layers. The model predictions are consistent with reported experimental data.

Determination of surface barrier height and surface state density in GaN films grown on sapphire substrates

2004 ◽  
Vol 831 ◽  
Author(s):  
Seong-Eun Park ◽  
Joseph J. Kopanski ◽  
Youn-Seon Kang ◽  
Lawrence H. Robins ◽  
Hyun-Keel Shin
Keyword(s):  
Barrier Height ◽  
Surface State ◽  
Deep Level ◽  
Surface States ◽  
State Density ◽  
Beam Power ◽  
Surface Barrier ◽  
Surface State Density ◽  
Sapphire Substrates ◽  
Surface Electric Field

ABSTRACTPhotoreflectance (PR) modulation spectroscopy was performed to investigate surface properties of GaN films grown on sapphire substrates. From the period of the Franz-Keldysh oscillations, the surface electric field across the GaN space charge region was found to be (197 ± 11) kV/cm, which corresponds to a surface state density of 1.0×1012 cm−2. A surface barrier height of 0.71 eV was determined by fitting the dependence of the PR intensities on pump beam power density. We suggest that a deep level is formed at 2.68 eV above the GaN valence band edge due to the large density of surface states.

Analytical modeling of bare surface barrier height and charge density in AlGaN/GaN heterostructures

2012 ◽  
Vol 101 (10) ◽  
pp. 103505 ◽  
Author(s):  
Nitin Goyal ◽  
Benjamin Iñiguez ◽  
Tor A. Fjeldly
Keyword(s):  
Charge Density ◽  
Barrier Height ◽  
Analytical Modeling ◽  
Surface Barrier ◽  
Bare Surface

Surface barrier height in metal-n-6H-SiC structures

1995 ◽  
Vol 29 (1-3) ◽  
pp. 198-201 ◽  
Author(s):  
A.L. Syrkin ◽  
A.N. Andreev ◽  
A.A. Lebedev ◽  
M.G. Rastegaeva ◽  
V.E. Chelnokov
Keyword(s):  
Barrier Height ◽  
Surface Barrier
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