Extended Hydrodynamic Models and Multigrid Solver of a Silicon Diode Simulation. (31st August 2016)

• Record Type: Journal Article
• Authors: Hu, Zhicheng; Li, Ruo; Qiao, Zhonghua
• Is Part Of: Communications in computational physics. Volume 20:Number 3(2016:Sep.)
• Page Start: 551
• Page End: 582
• Publication Date: 2016-08-31
• Subjects: 35L75, -- 35Q20, -- 65N55, -- 82D37; Boltzmann transport equation, -- extended hydrodynamic model, -- moment-dependent relaxation time, -- multigrid, -- semiconductor device simulation; Mathematical physics -- Data processing -- Periodicals; Physics -- Data processing -- Periodicals; 530.150285
• DOI: 10.4208/cicp.290615.020316a
• Languages: English
• ISSNs: 1815-2406

Abstract

Abstract: Extended hydrodynamic models for carrier transport are derived from the semiconductor Boltzmann equation with relaxation time approximation of the scattering term, by using the globally hyperbolic moment method and the moment-dependent relaxation time. Incorporating the microscopic relaxation time and the applied voltage bias, a formula is proposed to determine the relaxation time for each moment equation, which sets different relaxation rates for different moments such that higher moments damp faster. The resulting models would give more satisfactory results of macroscopic quantities of interest with a high-order convergence to those of the underlying Boltzmann equation as the involved moments increase, in comparison to the corresponding moment models using a single relaxation time. In order to simulate the steady states efficiently, a multigrid solver is developed for the derived moment models. Numerical simulations of an n + - n - n + silicon diode are carried out to demonstrate the validation of the presented moment models, and the robustness and efficiency of the designed multigrid solver.