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ABACUS is a collection of tools for the teaching fundamental concepts of semiconductor devices. These concepts typically include lattices, crystal structure, bandstructure, band models, carrier distributions, drift, diffusion, pn junctions, solar cells, light-emitting diodes (LED), bipolar junction transistors (BJT), metal-oxide semiconductor capacitors (MOScap), and multi-acronym-device field effect transistors (madFETs).
ABACUS is the key element in the
Tool-Powered Curriculum on Semiconductor Device Education.
Homework: WKB Approximation
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09 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck
Energy Bands as a Function of the Geometry of the n-Well Potential: an Exercise
05 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck
Explores the position and the width of the bands as a function of the 10-barrier potential parameters. NSF
Can we define unique effective masses in Si nanowires?
06 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck
This exercise teaches the users that for small nanostructures the concept of the effective mass becomes vague and in order to properly describe nanostructures one has to take into account the …
Tutorial on Semi-empirical Band Structure Methods
06 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska
This tutorial explains in details the Empirical Pseudopotential Method for the electronic structure calculation, the tight-binding method and the k.p method. For more details on the Empirical …
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
Exercise: Dopants and Semiconductor Statistics
This exercise emphasizes the calculation of the position of the Fermi level at T=0K and it also teaches the students about Einstain relation for non-degenerate …
PN Diode Exercise: Series Resistance
An exercise in determining the series resistance in a PN diode.
Exercise: PIN Diode
An exercise in the operation of a PIN diode under the conditions of forward and reverse bias.
PN Diode Exercise: Graded Junction
An exercise in determining the preferred approach to solving the Poisson equation.
Schred: Exercise 1
This exercise illustrates basic SCHRED capabilities for modeling MOS capacitors and also illustrates how the bound states distribution in energy changes with doping. The average distance of the …
SCHRED: Exercise 2
In this exercise students examine the doping dependence of the threshold voltage shift in MOS capacitors due to the quantum-mechanical charge description in the channel.www.eas.asu.edu/~vasileskNSF
Schred: Exercise 3
This exercise examines the degradation of the total gate capacitance with technology generation due to Maxwell-Boltzmann instead of Fermi-Dirac statistics, quantum-mechanical charge description and …
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 …
Periodic Potentials and the Kronig-Penney Model
01 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska
This material describes the derivation of the Kronig-Penney model for delta-function periodic potentials.
Quantum-Mechanical Reflections in Nanodevices: an Exercise
02 Jul 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck
This exercise points out to the fact that quantum-mechanical reflections are going to be significant in nanoscale devices and proper modeling of these device structures must take into consideration …
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 …
From 1 well to 2 wells to 5 wells to periodic potentials: an Exercise
This exercise demonstrates that the interaction between the wells lifts the degeneracy of the quasi-bound states and if in the limit we have infinite periodic potential it leads to formation of …
Exercise: CV curves for MOS capacitors
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 …
Quantum-Mechanical Reflections: an Exercise
30 Jun 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck
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