# Support

## Support Options

• ### Knowledge Base

Find information on common issues.

• ### Ask the Community

Ask questions and find answers from other users.

• ### Wish List

Suggest a new site feature or improvement.

• ### Support Tickets

Check on status of your tickets.

## Tags: ABACUS

#### Description

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.

### Resources (61-80 of 89)

1. PN Diode Exercise: Series Resistance

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

An exercise in determining the series resistance in a PN diode.

http://nanohub.org/resources/4894

2. 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.

http://nanohub.org/resources/4896

3. PN Diode Exercise: Graded Junction

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

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

http://nanohub.org/resources/4898

4. Schred: Exercise 1

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

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...

http://nanohub.org/resources/4900

5. SCHRED: Exercise 2

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

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

http://nanohub.org/resources/4902

6. Schred: Exercise 3

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

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...

http://nanohub.org/resources/4904

7. 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...

http://nanohub.org/resources/4906

8. 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.

http://nanohub.org/resources/4847

9. 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...

http://nanohub.org/resources/4849

10. Periodic Potentials and Bandstructure: an Exercise

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

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...

http://nanohub.org/resources/4851

11. From 1 well to 2 wells to 5 wells to periodic potentials: an Exercise

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

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...

http://nanohub.org/resources/4853

12. 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...

http://nanohub.org/resources/4855

13. Quantum-Mechanical Reflections: an Exercise

30 Jun 2008 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

http://nanohub.org/resources/4831

14. 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...

http://nanohub.org/resources/4796

15. Quantum Size Effects and the Need for Schred

23 Jun 2008 | Downloads | Contributor(s): Dragica Vasileska

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...

http://nanohub.org/resources/4794

16. BJT Lab

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.

http://nanohub.org/resources/bjt

17. Drift-Diffusion Lab

22 Jan 2008 | Tools | Contributor(s): Saumitra Raj Mehrotra, Abhijeet Paul, Gerhard Klimeck, Gloria Wahyu Budiman

Simulate single semiconductor characteristics

http://nanohub.org/resources/semi

18. 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

http://nanohub.org/resources/kronig_penney

19. Carrier Statistics Lab

08 Jan 2008 | Tools | Contributor(s): Saumitra Raj Mehrotra, Abhijeet Paul, Gerhard Klimeck

Calculate the electron & hole density in semiconductors

http://nanohub.org/resources/fermi

20. Crystal Viewer Tool

22 Dec 2007 | Tools | Contributor(s): Yuanchen Chu, Daniel F Mejia, James Fonseca, Michael Povolotskyi, Gerhard Klimeck

Visualize different crystal lattices and planes

http://nanohub.org/resources/crystal_viewer

### Legal

nanoHUB.org, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.