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Application of the collocation method in three dimensions to a model semiconductor problem. (English) Zbl 0864.65084

Summary: A research code has been written to solve an elliptic system of coupled nonlinear partial differential equations of conservation form on a rectangularly shaped three-dimensional domain. The code uses the method of collocation of Gauss points with tricubic Hermite piecewise continuous polynomial basis functions. The system of equations is solved by iteration. The system of nonlinear equations is linearized, and the system of linear equations is solved by iterative methods. When the matrix of the collocation equations is duly modified by using a scaled block-limited partial pivoting procedure of Gauss elimination, it is found that the rate of convergence of the iterative method is significantly improved and that a solution becomes possible. The code is used to solve Poisson’s equation for a model semiconductor problem. The electric potential distribution is calculated in a metal-oxide-semiconductor structure that is important to the fabrication of electron devices.

MSC:

65Z05 Applications to the sciences
35J65 Nonlinear boundary value problems for linear elliptic equations
35Q60 PDEs in connection with optics and electromagnetic theory
78A55 Technical applications of optics and electromagnetic theory
65N35 Spectral, collocation and related methods for boundary value problems involving PDEs
65H10 Numerical computation of solutions to systems of equations

Software:

PLTMG; ELLPACK; ANSYS
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Full Text: DOI

References:

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