Negative Differential Resistivity Exercise

28 Jun 2010 | Teaching Materials | Contributor(s): Gerhard Klimeck, Parijat Sengupta, Dragica Vasileska

In certain semiconductors such as GaAs and InP the average velocity as a function of field strength displays a maximum followed by a regime of decreasing velocity. Hilsum, Ridley, and Watkins …

https://nanohub.org/resources/9238

Exercise for MOSFET Lab: Device Scaling

28 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This exercise explores device scaling and how well devices are designed.

https://nanohub.org/resources/9221

Quantum Bound States Exercise

16 Jun 2010 | Teaching Materials | Contributor(s): Gerhard Klimeck, Parijat Sengupta, Dragica Vasileska

Exercise Background Quantum-mechanical systems (structures, devices) can be separated into open systems and closed systems. Open systems are characterized with propagating or current carrying …

https://nanohub.org/resources/9191

Quantum Tunneling Exercise

16 Jun 2010 | Teaching Materials | Contributor(s): Gerhard Klimeck, Parijat Sengupta, Dragica Vasileska

Exercise Background Tunneling is fully quantum-mechanical effect that does not have classical analog. Tunneling has revolutionized surface science by its utilization in scanning tunneling …

https://nanohub.org/resources/9193

Periodic Potentials Exercise

16 Jun 2010 | Teaching Materials | Contributor(s): Gerhard Klimeck, Parijat Sengupta, Dragica Vasileska

In this exercise, various calculations of the electronic band structure of a one-dimensional crystal are performed with the Kronig-Penney (KP) model. This model has an analytical solution and …

https://nanohub.org/resources/9195

Crystal Viewer Tool Verification

15 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This text verifies the Crystal Viewer Tool by comparing the amount of dangling bonds at the silicon surface for [100], [110] and [111] crystal orientation. The crystal viewer results are in agreement …

https://nanohub.org/resources/9156

Crystal Structures - Packing Efficiency Exercise

15 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

Consider the most efficient way of packing together equal-sized spheres and stacking close-packed atomic planes in three dimensions. For example, if plane A lies beneath plane B, there are two …

https://nanohub.org/resources/9154

PCPBT Manual

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This is a manual for the Piece-Wise Constant Potential Barrier Tool.

https://nanohub.org/resources/9117

Tight-Binding Band Structure Calculation Method

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This set of slides describes on simple example of a 1D lattice, the basic idea behind the Tight-Binding Method for band structure calculation.

https://nanohub.org/resources/9122

Poisson Equation Solvers

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska

There are two general schemes for solving linear systems: Direct Elimination Methods, and Iterative Methods. All the direct methods are, in some sense, based on the standard Gauss …

https://nanohub.org/resources/9124

Poisson Equation Solvers - General Considerations

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska

We describe the need for numerical modeling, the finite difference method, the conversion from continuous set to set of matrix equations, types of solvers for solving sparse matrix equations of the …

https://nanohub.org/resources/9125

Conjugate Gradient Tutorial

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska

This is an extensive tutorial on the description and implementation of the basic conjugate gradient method and its variants.

https://nanohub.org/resources/9127

Multigrid Tutorial

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska

This set of slides describe the idea behind the multigrid method and its implementation.

https://nanohub.org/resources/9129

Crystal Structures

08 Jun 2010 | Teaching Materials | Contributor(s): David K. Ferry, Dragica Vasileska, Gerhard Klimeck

In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a basis, a set of atoms arranged in a particular way, and a …

https://nanohub.org/resources/9134

Crystal Directions and Miller Indices

08 Jun 2010 | Teaching Materials | Contributor(s): David K. Ferry, Dragica Vasileska, Gerhard Klimeck

Miller indices are a notation system in crystallography for planes and directions in crystal lattices. In particular, a family of lattice planes is determined by three integers, l, m, and n, the …

https://nanohub.org/resources/9136

Verification of the Validity of the PN Junction Tool

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

These simulations and comparisons with the depletion charge approximation prove the validity of the PN Junction tool.

https://nanohub.org/resources/9138

Solve a Challenge for a PN Diode

08 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This is SOLVE A CHALLENGE PROBLEM for pn-diodes.

https://nanohub.org/resources/9140

Drift-Diffusion Modeling and Numerical Implementation Details

01 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska

This tutorial describes the constitutive equations for the drift-diffusion model and implementation details such as discretization and numerical solution of the algebraic equations that result from …

https://nanohub.org/resources/9092

Physical and Analytical Description of the Operation of a PN Diode

01 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska

A detailed physical and analytical description of the operation of PN diodes is given. vasileska.faculty.asu.edu NSF

https://nanohub.org/resources/9094

Worked Examples for a PN Diode

01 Jun 2010 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

several worked examples are presented that illustrate the operation of a PN diode.

https://nanohub.org/resources/9096