共查询到20条相似文献,搜索用时 0 毫秒
1.
Giulio Ferrari A. Asenov M. Nedjalkov C. Jacoboni 《Journal of Computational Electronics》2006,5(4):419-423
Combining an insight on the quantum transport given by the Wigner function formalism and the classical perturbation theory,
an algorithm has been developed that allows the introduction of collisional broadening in semiclassical electron transport
Monte Carlo (MC) simulations. In the proposed algorithm, electron energy and momentum are treated as independent variables;
the laws of energy and momentum conservation are fulfilled at each scattering event, but the relationship between energy and
momentum is not given by the traditional expression, since Bloch states are not eigenstates of the total Hamiltonian. The
results obtained for a simple model semiconductor demonstrate that the non-physical instabilities observed in previous attempts
to introduce collisional broadening in semiclassical MC simulations have been removed. The algorithm is suitable for application
in MC simulations of realistic device models. 相似文献
2.
Source-to-drain tunneling in deca-nanometer double-gate MOSFETs is studied using a Monte Carlo solver for the Wigner transport equation. This approach allows the effect of scattering to be included. The subband structure is calculated by means of post-processing results from the device simulator Minimos-NT, and the contribution of the lowest subband is determined by the quantum transport simulation. By separating the potential profile into a smooth classical component and a rapidly varying quantum component the numerical stability of the Monte Carlo method is improved. The results clearly show an increasing tunneling component of the drain current with decreasing gate length. For longer gate lengths the semi-classical result is approached. 相似文献
3.
Damien Querlioz Philippe Dollfus Van-Nam Do Arnaud Bournel Van Lien Nguyen 《Journal of Computational Electronics》2006,5(4):443-446
We present an original approach to including quantum transport into classical Ensemble Monte Carlo (EMC) simulations. The
method, based on the Wigner transport equation, is fully self-consistent, and includes impurity and phonon scattering according
to the Fermi Golden rule. It is inspired by an approach suggested by Shifren et al. [IEEE Trans. Electron Dev. 50, 769 (2003)],
with some major improvements that make possible successful comparison with other simulation techniques and experiments. 相似文献
4.
We present results of both Gaussian wave-packet tunneling though a single barrier structure and RTD operation achieved from a particle-based Ensemble Monte Carlo (EMC) simulation that is based on the Wigner distribution function (WDF). Methods of including the Wigner potential into the EMC, to incorporate naturally quantum phenomena, via a particle property we call the affinity are discussed. Results showing tunneling and correlation build-up in both cases are presented. 相似文献
5.
J. Saint-Martin A. Bournel V. Aubry-Fortuna F. Monsef C. Chassat P. Dollfus 《Journal of Computational Electronics》2006,5(4):439-442
A new two-dimensional self-consistent Monte-Carlo simulator including the multi sub-band transport in a 2D electron gas is
described and applied to an ultra-thin Double Gate MOSFET. This approach takes into account both out of equilibrium transport
and quantization effects. This method improves significantly microscopic insight into the operation of deep sub-100 nm CMOS
devices. We analyze the ballistic, quantization and roughness effects in a 12 nm-long DGMOS transistor. In particular, we
focus on the link between non-stationary transport and the evolution of sub-band occupancy along the channel. 相似文献
6.
M. Aldegunde A. J. García-Loureiro A. Martinez K. Kalna 《Journal of Computational Electronics》2008,7(3):201-204
Novel thin-body architectures with complex geometry are becoming of large interest because they are expected to deliver the
ITRS prescribed on-current when semiconductor transistors are scaled into nanometer dimensions. We report on the development
of a 3D parallel Monte Carlo simulator coupled to a finite element solver for the Poisson equation in order to correctly describe
the complex domains of advanced FinFET transistors. We study issues such as charge assignment, field calculation, treatment
of contacts and parallelisation approach which have to be taken into account when using tetrahedral elements. The applicability
of the simulator is demonstrated by modelling a 10 nm gate length double gate MOSFET with a body thickness of 6.1 nm. 相似文献
7.
We investigate a quantum-correction method for Monte Carlo device simulation. The method consists of reproducing quantum mechanical
density-gradient simulation by classical drift-diffusion simulation with modified effective oxide thickness and work function
and using these modifications subsequently in Monte Carlo simulation. This approach is found to be highly accurate and can
be used fully automatically in a technology computer-aided design (TCAD) workbench project. As an example, the methodology
is applied to the Monte Carlo simulation of the on-current scaling in p- and n-type MOSFETs corresponding to a 65 nm node technology. In particular, it turns out that considering only the total threshold
voltage shift still involves a significant difference to a Monte Carlo simulation based on the combined correction of oxide
thickness and work function. Ultimately, this quantum correction permits to consider surface scattering as a combination of
specular and diffusive scattering where the conservation of energy and parallel wave vector in the specular part takes stress-induced
band structure modifications and hence the corresponding surface mobility changes on a physical basis into account. 相似文献
8.
A. G. Bakirtzis Yong-Ha Kim A. P. Sakis Meliopoulos 《Electric Power Systems Research》2002,60(3):137-144
A Monte Carlo simulation method for evaluating retail-wheeling effects on power systems is formulated and solution methods are presented. The effects of wheeling on operating cost, transmission losses, and system security are considered. For a specific operating condition, the effects are quantified by the sensitivity of specific quantities of interest with respect to power wheeling level. Quantities of interest are total operating cost, transmission losses and security, which is quantified with several indices. This model is utilized within a Monte Carlo simulation to calculate probability distribution functions of the incremental effects of wheeling on operating cost, transmission losses, and system security. The model and solution methods are applied on an example power system and the results are presented. 相似文献
9.
Christian Jirauschek Giuseppe Scarpa Paolo Lugli Maurizio Manenti 《Journal of Computational Electronics》2007,6(1-3):267-270
We report on Monte Carlo (MC) simulations aimed at the design and optimization of GaAs-based THz quantum cascade lasers. Results
are presented for a GaAs/Al0.15Ga0.85As quantum cascade laser design based on LO phonon scattering depopulation, which operates at 2.8 THz. The obtained electron
distribution functions in the subbands and the photoluminescence spectra are compared to experimental results. Also the dependence
of the inversion and current density on the applied field is investigated, and the parasitic channels are identified based
on the intersubband lifetimes. 相似文献
10.
For nanoscale electron devices, the role of a single-electron (or a single-impurity) can have a large impact on their electrical
characteristics. A new method for introducing the long-range and short-range Coulomb interaction in semiconductor semi-classical
Monte Carlo simulations is presented. The method is based on directly dealing with a many-particle system by solving a different
Poisson equation for each electron. The present work shows the numerical viability of this alternative approach for nanoscale
devices with few (<100) electrons. The method is compared with the traditional “mean-field” Monte Carlo simulations. It is
shown, numerically, that the “mean-field” approximation produces important errors for aggressively-scaled devices. 相似文献
11.
Evgenij Starikov Pavel Shiktorov Viktoras Gružinskis Alexandr Dubinov Vladimir Aleshkin Luca Varani Christophe Palermo Lino Reggiani 《Journal of Computational Electronics》2007,6(1-3):45-48
A possibility to develop the so called TASER (Terahertz-Amplification-by-the-Stimulated-Emission-of- Radiation) by using two-dimensional
(2D) electron transport in quantum well (QW) structures is investigated by Monte Carlo simulation of the optical-phonon-emission
assisted transit-time resonance (OPTTR) of 2D electrons in momentum space under the low lattice temperature. A considerable
extension of the frequency region for THz radiation generation (upto 5 times) when going from 3D- to 2D-case is predicted. 相似文献
12.
Barry Zorman Santhosh Krishnan Dragica Vasileska Jialei Xu Mark Van Schilfgaarde 《Journal of Computational Electronics》2004,3(3-4):351-354
We present an ab-inito band-structure approach that can be applied for holes in Monte Carlo simulations of strained SiGe channel devices in order to remove the uncertainties of alloy scattering parameters along with addressing the effects of strain. 相似文献
13.
H. López G. Albareda X. Cartoixà J. Suñé X. Oriols 《Journal of Computational Electronics》2008,7(3):213-216
Electron transport becomes (quasi-) ballistic for nanoscale devices with active regions smaller than 20 nm. Under these conditions,
the current and the noise are mainly determined by the electron injection process. Thus, the numerical simulation of these
small devices can be very sensible to the boundary conditions (BC). In this work, we present a novel BC for (time-dependent)
particle simulators that fulfill Fermi statistics and charge neutrality at the contacts. Monte Carlo simulations of a nanometric
two-terminal device using a traditional injection model and the novel model presented in this work are compared. 相似文献
14.
C. Sampedro F. Gámiz A. Godoy F. Jiménez-Molinos 《Journal of Computational Electronics》2007,6(1-3):41-44
A Quantum Ensemble Monte Carlo (QEMC) simulator is used to calculate electrical characteristics and transient response of
actual nanotransistors: both sub-50 nm CMOS N-MOSFETs and ultrathin double gate SOI transistors have been deeply studied.
Doping profiles and oxide thickness have been selected to cope with the available specifications of the ITRS Roadmap. The
Quantum corrected Ensemble Monte Carlo simulator (QEMC) has been used to self-consistently solve the Boltzmann Transport and
Poisson equations in actual devices. Quantum effects are included through the Multi-Valley Effective Conduction Band Edge
(MV-ECBE) technique, and adequate approaches for phonon and surface roughness scattering have been developed to include the
effects of carrier quantization in pseudo-2DEG simulations. 相似文献
15.
Xavier Oriols 《Journal of Computational Electronics》2007,6(1-3):239-242
Electron transport in mesoscopic systems is analyzed in terms of quantum (Bohm) trajectories associated to wave-function solutions of a many-particle (effective-mass) Schrödinger equation. Many-particle Bohm trajectories can be computed from single-particle Schrödinger equations. As an example, electron correlations for a triple-barrier tunneling system with electron-electron interactions are computed. Simulated noise results for interacting electrons that tunnels through triple barriers are presented. The approach opens a new path for studying electron transport and quantum noise in nanoscale systems, beyond the “Fermi liquid” paradigm. 相似文献
16.
A theoretical investigation of electron-electron scattering in quantum cascade lasers is presented. The devices are studied by means of an ensemble Monte Carlo simulation that includes all relevant scattering mechanisms. The energy levels and wave functions are determined by a self-consistent resolution of the Schrödinger and Poisson equations. The influence of the modelling of carrier-carrier scattering is discussed on the example of a resonant-phonon structure operating at 3.4 THz. To demonstrate the usefulness of such a model for optimization purpose, an alternative design operating at a lower frequency is proposed. Our model predicts that a significant population inversion can be achieved at about 1 THz. 相似文献
17.
18.
We present a three‐dimensional (3D) semi‐classical ensemble Monte Carlo model newly developed to simulate a variety of nanoelectronic devices. The characteristics of the 3D model are compared with the widely used two‐dimensional (2D) models. The advantages of our model, in terms of accuracy in modelling the physics behind the operation of nanodevices, are presented by applying it to T‐branch junctions based on InGaAs/InAlAs heterostructures. Simulation of a T‐branch junction with a Schottky gate terminal is presented, using both 2D and 3D models, demonstrating the necessity of using 3D simulation models to study the physics of complex‐geometry nanostructures. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
19.
F. Gámiz A. Godoy C. Sampedro N. Rodriguez F. Ruiz 《Journal of Computational Electronics》2008,7(3):205-208
Electron transport in strained double gate silicon on insulator transistors has been studied by Monte Carlo method. Poisson
and Schroedinger equations have been self-consistently solved in these devices for different silicon layer thicknesses both
for unstrained and strained silicon channels. The results show that the strain of the silicon layer leads to a larger population
of the no-primed subbands, thus decreasing the average conduction effective mass. However, strain also contributes to a larger
confinement of the charge close to the two Si/SiO2 interfaces, thus weakening the volume inversion effect, and limiting the potential increase of the phonon limited mobility. 相似文献
20.
Effects of conduction-band non-parabolicity on electron transport properties in silicon-on-insulator (SOI) metal-oxide-semiconductor field effect transistors (MOSFETs) are studied by performing Monte Carlo simulation with a full-band modeling. An empirical pseudo-potential method is adopted for evaluating the two-dimensional electronic states in SOI MOSFETs. SOI-film thickness dependence of phonon-limited mobility, drift-velocity and subband occupancy is calculated and the results are compared with those of a simple effective mass approximation. The non-parabolicity effects are found to play an important role in 4-fold valleys under higher applied electric fields or at higher temperatures. 相似文献