Hydrodynamic approach for modelling transport in quantum well device structures
Author
Besikci, C.
Tanatar, Bilal
Sen, O.
Date
1998Source Title
Journal of Physics D: Applied Physics
Print ISSN
0022-3727
Publisher
Institute of Physics Publishing Ltd.
Volume
31
Issue
17
Pages
2211 - 2219
Language
English
Type
ArticleItem Usage Stats
154
views
views
105
downloads
downloads
Abstract
A semiclassical approach for modelling electron transport in quantum well structures is presented. The model is based on the balance equations governing the conservation of particle density, momentum and energy with Monte Carlo (MC) generated transport parameters. Three valleys of the conduction band, size quantization in the Γ valley, and the lowest two subbands in the quantum well are considered by taking the detailed intersubband dynamics into account. The transport parameters of the model are extracted from steady-state MC simulations based on an improved formulation of two-dimensional polar optical phonon scattering including screening effects. The predictions of the proposed model have been found to be in excellent agreement with those of the ensemble MC simulations under both time varying and spatially nonuniform fields. The calculated transport parameters which are of interest for device modelling are presented as a function of the electron energy for the AIGaAs/GaAs quantum well. The model serves as an accurate semiclassical alternative to costly ensemble MC simulations for studying the transport in quantum well structures and for the modelling and optimization of submicron devices based on these structures, such as modulation doped field-effect transistors (MODFETs).
Keywords
Computer simulationElectron transport properties
Hydrodynamics
Monte Carlo methods
Phonons
Semiconducting aluminum compounds
Semiconducting gallium arsenide
Semiconductor device models
Semiconductor device structures
Energy conservation equation
Momentum conservation equation
Particle density conservation equation
Semiconductor quantum wells