Nanostructures

Download e-book for iPad: Coupled Multiscale Simulation and Optimization in by Michael Günther

By Michael Günther

ISBN-10: 3662466716

ISBN-13: 9783662466711

ISBN-10: 3662466724

ISBN-13: 9783662466728

Designing complicated built-in circuits is predicated seriously on mathematical tools and demands compatible simulation and optimization instruments. the present layout procedure contains simulations and optimizations in several actual domain names (device, circuit, thermal, electromagnetic) and in a variety of electric engineering disciplines (logic, timing, strength, crosstalk, sign integrity, method functionality). COMSON used to be a Marie Curie study education community created to satisfy those new medical and coaching demanding situations via (a) constructing new descriptive types that take those mutual dependencies under consideration, (b) combining those versions with current circuit descriptions in new simulation suggestions and (c) constructing new optimization recommendations that might accommodate new designs.

The publication offers the most venture leads to the fields of PDAE modeling and simulation, version order aid strategies and optimization, in line with merging the information of 3 significant ecu semiconductor businesses with the mixed services of college teams really expert in constructing appropriate mathematical versions, numerical schemes and e-learning amenities. moreover, a standard Demonstrator Platform for trying out mathematical equipment and techniques used to be created to evaluate whether or not they are able to addressing the industry’s difficulties, and to coach younger researchers by means of delivering hands-on event with state of the art difficulties.

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15) In the following sections we will see explicitly several of these partial differential models. 3. Ui / is the electric current, which can be a component of the variable Ui , or can be evaluated as a functional of the said variable. 13), through the electric field Ei . 17) The term @t@ Ei is the displacement current, and represents the current induced by time-variations of the electric field. 21) 26 G. Alì et al. 1 The components of the vector jD are not independent. 19). Since the electric field is not affected by a time-dependent translation of the electric potential, 2 PDAE Modeling and Discretization i D !

42 G. Alì et al. 57). At this aim, we consider the Voronoi cells Vi corresponding to grid nodes xi in D;k , and we integrate the S charge conservation equation on the union of these Voronoi cells, VD;k D xi 2 D;k Vi : Ä Z VD;k @ . qn C qp/ C r . 97) Using Poisson’s equation, we find @D @ . qn C qp/ D r ; @t @t DD ED r : Then, by the divergence theorem, we can write Ä Z r VD;k D Z Ä Z @D @t qjn C qjp dx D n @VD;k Ä @D @t qjn C qjp d @D qjn C qjp d @t @VD;k \@˝ Ä Z @D qjn C qjp d D 0: n C @t @VD;k n@˝ n The first integral is approximately the outer current flux through the Ohmic contact D;k , that is, with our convention, Ä Z n @VD;k \@˝ @D @t qjn C qjp d jD;k : The maximum error in this approximation occurs when the grid points on D;k closer to the neighboring Neumann boundary are located on the junction between Dirichlet and Neumann boundary, in which case @VD;k \ @˝ consists of D;k bordered with a strip whose thickness is the order of half the diameter of the Voronoi cells.

47) N; is the built-in potential, given by  bi Nbi D Vth ln C 2ni s  Nbi 2ni Ã2 à C1 ; uiD;j , j D 0; 1; : : : ; K, are the applied potentials at the Ohmic contacts of the device, and is the external unit normal to @˝. t/. 48) where the Dirichlet data nbi , pbi are given by Nbi nbi D C 2 s  Nbi 2 Ã2 C n2i ; pbi D Nbi C 2 s  Nbi 2 Ã2 C n2i ; and the initial data n0 , p0 are arbitrary functions. nbi =ni /, and nbi pbi D n2i . 16), with D qn C qp. Then we can apply the formalism described in the previous subsections.

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Coupled Multiscale Simulation and Optimization in Nanoelectronics by Michael Günther


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