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Crystal Structures - Packing Efficiency Exercise

15 Jun 2010 | 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 possible ways of placing an additional atom on top of layer B. If an additional layer was placed...

Crystal Structures

08 Jun 2010 | 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 lattice. The basis is located upon the points of a lattice spanned by lattice vectors, which is an...

Modeling of MEMORIES with Silvaco

07 Jul 2011 | Contributor(s): Dragica Vasileska

This set of lecture notes gives overview on MEMORIES and their classification and focuses on modeling of EEPROMs.

Silvaco Athena - Part 1

04 Aug 2011 | Contributor(s): Dragica Vasileska

This is part of a series of lectures on process modeling. In this lecture some introductory concepts are described followed by a description of the ion implantation process.

Schottky diode - Theoretical exercises

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02 Aug 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

Quantum Mechanics: The story of the electron spin

09 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

One of the most remarkable discoveries associated with quantum physics is the fact that elementary particles can possess non-zero spin. Elementary particles are particles that cannot be divided into any smaller units, such as the photon, the electron, and the various quarks. Theoretical and...

ACUTE: Hydrodynamic Modeling

22 Jul 2010 | Teaching Materials | Contributor(s): Dragica Vasileska

This set of slides clearly explains when and where Hydrodynamic models can be used and what are their limitations.

Boltzmann Transport Equation and Scattering Theory

29 Jan 2011 | Teaching Materials | Contributor(s): Dragica Vasileska

In this presentation we give simple derivation of the Boltzmann transport equation, describe the derivation of Fermi's Golden Rule, and present the derivation of most common scattering mechanisms in semiconductors.

Exercise: CV curves for MOS capacitors

02 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This exercise demonstrates to the students how the low-frequency CV curves in MOS capacitors change with changing the gate workfunction, the oxide thickness and the dielectric constant. It also demonstrates the doping variation of the high-frequency CV curves.NSFNSF

Generalized Monte Carlo Presentation

17 Jun 2011 | Teaching Materials | Contributor(s): Dragica Vasileska

This presentation goes along with the Bulk Monte Carlo tool on the nanoHUB that calculates transients and steady-state velocity-field characteristics of arbitrary materials such as Si, Ge, GaAs, GaN, SiC, etc. The tool employs a non-parabolic bandstructure.

Verification of the Validity of the MOSFET Tool

10 Oct 2010 | Teaching Materials | Contributor(s): Saumitra Raj Mehrotra, Dragica Vasileska, Gerhard Klimeck

Output characteristics of a bulk MOSFET are computed using MOSFET lab and compared with an analytical model based on Bulk-Charge theory. Parasitic resistance is used as a fitting parameter in the analytical model. MATLAB script used for verification is also available for download.

Exercise for MOS Capacitors: CV curves and interface and Oxide Charges

30 Jul 2009 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This exercise is designed to teach the students how the CV curves of an ideal MOS Capacitor change in the presence of oxide or interface charges.

Low-dimensional structures

This set of slides describes some general properties of low-dimensional systems and their applications in nanoelectronics.

Worked Examples for a PN Diode

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

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

Tunneling Through Triangular Barrier: an Exercise for PCPBT

23 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This exercise teaches the users that a very good result can be obtained when the triangular barrier is approximated with 11 segment piece-wise constant potential barrier steps.www.eas.asu.edu/~vasileskNSF

MOSFET Exercise

07 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

With this exercise students are familiarized with the punchthrough effect, the series resistance at the source and drain region and the importance of impact ionization at high gate and drain bias conditions.www.eas.asu.edu/~vasileskNSF

Exercise: PIN Diode

06 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

An exercise in the operation of a PIN diode under the conditions of forward and reverse bias.

Bulk Band Structure: a Simulation Exercise

03 Aug 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This simulation exercise teaches the students about band structure of indirect and direct bandgap materials, the optical gaps, the concept of the effective mass and the influence of spin-orbit coupling on the valence bandstructure.NSF

Harmonic Oscillator: an Exercise

www.eas.asu.edu/~vasileskNSF

PN Diode Exercise: Graded Junction

An exercise in determining the preferred approach to solving the Poisson equation.

How Quantum-Mechanical Space-Quantization is Implemented in Schred, Drift-Diffusion (SILVACO ATLAS) and Particle-Based Device Simulators (Quamc2D)

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27 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska

This brief presentation outlines how one can implement quantum-mechanical space quantization effects exactly (using Schred) and approximately in drift-diffusion (using SILVACO), as well as particle-based device simulators (using Quamc2D).

Computational Electronics HW - Linearization of Poisson Equation

11 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

Exercise: Density of States Function Calculation

These exercises teach the students how to derive the DOS function for a 2D and a 1D system and to calculate the energy-dependent effective mass for non-parabolic bands.www.eas.asu.edu/~vasileskNSF

Periodic Potentials and Bandstructure: an Exercise

This exercise teaches the students that in the case of strong coupling between the neighboring wells in square and Coulomb periodic potential wells electrons start to behave as free electrons and the gaps that open at the Brillouin zone boundaries become smaller and smaller (thus recovering the...

Band Structure Lab Exercise

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

Investigations of the electron energy spectra of solids form one of the most active fields of research. Knowledge of band theory is essential for application to specific problems such as Gunn diodes, tunnel diodes, photo-detectors etc. There are several standard methods to compute the band...