Investigations on the Resistance Reduction Effect of Double-Trench SiC MOSFETs under Repetitive Avalanche Stress

2020 ◽  
Vol 1004 ◽  
pp. 998-1003
Author(s):  
Jia Xing Wei ◽  
Si Yang Liu ◽  
Sheng Li ◽  
Li Zhi Tang ◽  
Rong Cheng Lou ◽  
...  
Keyword(s):  
Impact Ionization ◽  
Optimization Method ◽  
Ionization Rate ◽  
Oxide Interface ◽  
Resistance Reduction ◽  
Source Resistance ◽  
Reduction Effect ◽  
Pass Through ◽  
Impact Ionization Rate ◽  
The Impact

The unexpected resistance reduction effect of double-trench SiC MOSFETs under repetitive avalanche stress is investigated in this work. After enduring repetitive avalanche stress, the ON-state drain-source resistance (Rdson) of the device decreases. With the help of TCAD simulations, the dominant mechanism is proved to be the injection of positive charges into the gate trench bottom oxide, which is almost irreversible under zero-voltage bias condition at room temperature. For the injected positive charges attract extra electrons just beneath the gate trench bottom, where the carriers pass through under ON state, the resistivity there is reduced, improving the conduction capability of the device. Moreover, an optimization method is proposed. Since the impact ionization rate (I.I.) and the vertical oxide electric field (E⊥) along the gate trench bottom oxide interface contribute to the injection of positive charges, it is recommended to make the bottom oxide thicker to suppress this effect.

Determination of the impact ionization rate of holes in tellurium at 77 K

1979 ◽  
Vol 55 (1) ◽  
pp. 197-202 ◽  
Author(s):  
Z. Dobrovolskis ◽  
W. Hoerstel ◽  
A. Krotkus
Keyword(s):  
Impact Ionization ◽  
Ionization Rate ◽  
Impact Ionization Rate ◽  
The Impact

scholarly journals New Method for Determination of Drain Saturation Voltage in Short Channel MOS Devices Between Liquid Helium to Room Temperature

2001 ◽  
Vol 24 (2) ◽  
pp. 129-134
Author(s):  
Y. Amhouche ◽  
A. El Abbassi ◽  
K. Raïs ◽  
E. Bendada ◽  
R. Rmaily
Keyword(s):  
Room Temperature ◽  
Impact Ionization ◽  
Ionization Rate ◽  
Channel Length ◽  
New Method ◽  
Short Channel ◽  
Mos Devices ◽  
Impact Ionization Rate ◽  
The Impact

A new method for drain saturation voltage extraction in submicron MOSFETs is presented. It is based on measurements of the partial derivative of the impact ionization rate. The method has been tested using main of channel length MOSFET devices and compared with others methods.

Field effect on the impact ionization rate in semiconductors

2000 ◽  
Vol 87 (2) ◽  
pp. 781-788 ◽  
Author(s):  
R. Redmer ◽  
J. R. Madureira ◽  
N. Fitzer ◽  
S. M. Goodnick ◽  
W. Schattke ◽  
...  
Keyword(s):  
Field Effect ◽  
Impact Ionization ◽  
Ionization Rate ◽  
Impact Ionization Rate ◽  
The Impact

Theoretical Study of Electron Initiated Impact Ionization Rate in Bulk GaN using a Wave Vector Dependent Numerical Transition Rate Formulation

1995 ◽  
Vol 395 ◽  
Author(s):  
J. Kolnik ◽  
I.H. Oguzman ◽  
K.F. Brennan ◽  
R. Wang ◽  
P.P. Ruden
Keyword(s):  
Monte Carlo ◽  
Transition Rate ◽  
Phonon Scattering ◽  
Impact Ionization ◽  
Golden Rule ◽  
Ionization Rate ◽  
Ensemble Monte Carlo ◽  
Bulk Gan ◽  
Impact Ionization Rate ◽  
The Impact

ABSTRACTIn this paper, we present ensemble Monte Carlo based calculations of electron initiated impact ionization in bulk zincblende GaN using a wavevector dependent formulation of the interband impact ionization transition rate. These are the first reported estimates, either theoretical or experimental, of the impact ionization rates in GaN. The transition rate is determined from Fermi’s golden rule for a two-body screened Coulomb interaction using a numerically determined dielectric function as well as by numerically integrating over all of the possible final states. The Monte Carlo simulator includes the full details of the first four conduction bands derived from an empirical pseudopotential calculation as well as all of the relevant phonon scattering mechanisms. It is found that the ionization rate has a relatively "soft" threshold.

Hot-Carrier Effect in Submicron pMOSFETs

1995 ◽  
Vol 391 ◽  
Author(s):  
S. Saha ◽  
C. S. Yeh ◽  
Ph. Lindorfer ◽  
J. Luo ◽  
U. Nellore ◽  
...  
Keyword(s):  
Impact Ionization ◽  
Ionization Rate ◽  
Hot Carrier ◽  
Carrier Effect ◽  
Substrate Current ◽  
Lateral Channel ◽  
Ionization Model ◽  
Hot Carrier Effect ◽  
Impact Ionization Rate ◽  
The Impact

AbstractThis paper describes an application of process and device simulation programs in the study of substrate current generated by hot-carrier effect in submicron p-channel MOSFET devices. The impact ionization model for holes was calibrated for accurate simulation of substrate current in submicron devices, and an expression for the impact ionization rate of holes in silicon is obtained. The simulated substrate current for 0.57, 0.73 and 1.13 μm devices obtained by the optimized expression agrees very well with the measured data. The optimized impact ionization expression was also used to simulate the effect of p- Lightly Doped Drain impurity profile on substrate current, and the simulated peak substrate current and the corresponding maximum lateral channel electric field as a function of p- dose and length are presented.

IMPACT IONIZATION AND HIGH FIELD EFFECTS IN WIDE BAND GAP SEMICONDUCTORS

2001 ◽  
Vol 11 (02) ◽  
pp. 511-524 ◽  
Author(s):  
M. REIGROTZKI ◽  
J. R. MADUREIRA ◽  
A. KULIGK ◽  
N. FITZER ◽  
R. REDMER ◽  
...  
Keyword(s):  
Electric Fields ◽  
High Field ◽  
Impact Ionization ◽  
Electron Distribution Function ◽  
Wide Band ◽  
Ionization Rate ◽  
Wide Bandgap ◽  
Bandgap Semiconductors ◽  
Impact Ionization Rate ◽  
The Impact

Impact ionization plays a crucial role for electron transport in wide-bandgap semiconductors at high electric fields. Therefore, a realistic band structure has to be used in calculations of the microscopic scattering rate, as well as high field quantum corrections such as the intercollisional field effect. Here we consider both, and evaluate the impact ionization rate for wide-bandgap materials such as ZnS. A pronounced softening of the impact ionization threshold is obtained, as found earlier for materials like Si and GaAs. This field dependent impact ionization rate is included within a full-band ensemble Monte Carlo simulation of high field transport in ZnS. Although the impact ionization rate itself is strongly affected, little effect is observed on measurable quantities such as the impact ionization coefficient or the electron distribution function itself.

Thermodiffusion - A New Approach To Plasma Self-Confinement

1983 ◽  
Vol 13 ◽  
Author(s):  
A. Forchel ◽  
B. Laurich ◽  
G. Mahler
Keyword(s):  
Density Of States ◽  
Laser Annealing ◽  
Impact Ionization ◽  
Ionization Rate ◽  
Fast Diffusion ◽  
New Approach ◽  
Electronic Mechanism ◽  
Impact Ionization Rate ◽  
The Impact ◽  
Annealing Experiments

ABSTRACTFrom a model for the thermodiffusion of high density plasmas an electronic mechanism for plasma self-confinement is derived. Due to the increase of the confinement densities with the density of states masses this effect should be most important in laser annealing experiments in Si but much weaker in GaAs. A fast diffusion of the surface generated plasma is found to enhance the impact ionization rate.

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