Friday morning October 31, nanoHUB tools and home directories will be unavailable from 6 AM to noon (eastern time); we're getting a new file server! All tool sessions will be lost. Also, the web site will be unavailable for about 15 minutes sometime between 8-9 AM.
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.
Capacitance of a MOS device
This tool version is unpublished and cannot be run. If you would like to have this version staged, you can put a request through HUB Support.
Archive Version 1.7
Published on 22 Apr 2010
Latest version: 1.8. All versions
doi:10.4231/D3TM72116 cite this
This tool is closed source.
The primary reason to study Metal-Oxide-Silicon (MOS) capacitors is to understand the principle of operation as well as the detailed analysis of the Metal-Oxide-Silicon Field Effect Transistor(MOSFET).
MOSCap simulates the one-dimensional electrostatics in typical single and dual-gate Metal-Oxide-Semiconductor device structures along the growth direction as a function of device size, geometry, oxide charge, temperature, doping concentration, and applied frequency. Among the quantities simulated, the low and high-frequency capacitance-voltage (CV) characteristics and various spatial profiles (e.g., energy band, vertical electric field, charge densities etc.) are of special importance. MOSCap also has an option for Surface Potential plot. It analytically gives the relation between applied gate potential and the semiconductor surface potential.
To better understand the operation of a MOS capacitor, we provide brief tutorials and some typical exercises. These resources are meant to help increase comprehension of the operation of MOS capacitors from a semi-classical viewpoint. For a quantum-mechanical description of the charge in a MOS capacitor channel, please use the SCHRED tool.
Tutorial on MOS capacitors operation
Tutorial on MOS capacitors modeling with PADRE
Exercises for MOS capacitors that utilize PADRE
Theoretical Exercise for MOS Capacitors
CV curves and charges in the oxide and at the semiconductor/oxide interface
MOSCap is based on the Padre simulation tool developed by Mark Pinto, R. Kent Smith, and Ashraful Alam at Bell Labs.
Improvements / modifications in subsequent version releases:
1.7 - Added Surface Potential Vs Gate Bias plot for PADRE based results.
1.6.2 - Fixed for not overwriting previous runs.
1.6.1 - Default parameter set restored to 0.1um thick oxide thickness,; Tau=1ns.
1.6 - Fixed phim definition for different gate materials.
1.5 - Meshing made more robust for convergence. Bias stepping made finer for low frequency CV curve near threshold voltage.
1.4.3 - Separated - PADRE based C-V calculations and Analytical Surface Potential plot to run independently.
1.4.2 - Fixed for error in sign of Interface trap and Oxide charge densities.
1.4.1 - Improved mesh density.
1.4 - Added Surface Potential plot option. Input deck modified for AC frequency and carrier lifetimes.
1.3 - Added the reference line for (Oxide Capacitance) Cox and interface trap charge in output plots.
1.2 - Added interface charge density in input deck.
1.1 - Updated work function (PHIms) definition. Input is now work function difference
1.0 - MOSCapacitor simulator launched.