Find information on common issues.
Ask questions and find answers from other users.
Suggest a new site feature or improvement.
Check on status of your tickets.
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.
Exercise: PIN Diode
Ranking is calculated from a formula comprised of user reviews and usage data. Learn more ›
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.
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
Schred Tutorial Version 2.1
23 Jun 2008 | Downloads | Contributor(s): Dragica Vasileska
This Schred tutorial [or User's Manual] is intended to help users of the Schred tool with the Rappture interface. Readers will find various examples for modeling single-gate and dual-gate capacitors …
Quantum Size Effects and the Need for Schred
In this paper, we provide a historical overview of the observation of quantum effects in both experimental and theoretical nanoscale devices. This overview puts into perspective the need for …
06 Feb 2008 | Tools | Contributor(s): Saumitra Raj Mehrotra, Abhijeet Paul, Gerhard Klimeck, Dragica Vasileska, Gloria Wahyu Budiman
This tool simulates a Bipolar Junction Transistor (BJT) using a 2D mesh. Powered by PADRE.
22 Jan 2008 | Tools | Contributor(s): Saumitra Raj Mehrotra, Abhijeet Paul, Gerhard Klimeck, Gloria Wahyu Budiman
Simulate single semiconductor characteristics
Periodic Potential Lab
19 Jan 2008 | Tools | Contributor(s): Abhijeet Paul, Junzhe Geng, Gerhard Klimeck
Solve the time independent schrodinger eqn. for arbitrary periodic potentials
Carrier Statistics Lab
08 Jan 2008 | Tools | Contributor(s): Saumitra Raj Mehrotra, Abhijeet Paul, Gerhard Klimeck
Calculate the electron & hole density in semiconductors
Crystal Viewer Tool
22 Dec 2007 | Tools | Contributor(s): Saumitra Raj Mehrotra, Michael Povolotskyi, Sebastian Steiger, Tillmann Christoph Kubis, Abhijeet Paul, Xingshu Sun, Victoria Savikhin, Gerhard Klimeck
Visualize different crystal lattices and planes
MOS Capacitors: Description and Semiclassical Simulation With PADRE
26 Jun 2006 | Online Presentations | Contributor(s): Dragica Vasileska
Introduction of Quantum-Mechanical Effects in Device Simulation
nanoHUB.org, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies.