Channel Quantization in a PHEMT : Channel Quantization in a PHEMT

Requires: Blaze/Quantum
Minimum Versions: Atlas 5.28.1.R

This example demonstrates the behaviour of a Pseudomorphic HEMT structure using the quantum model. The device is a standard AlGaAs / GaAs / InGaAs PHEMT with a delta doped layer.

The structure is created within the Atlas syntax. For more information on HEMT simulation see the HEMT Examples Section.

Before any external biases are applied, qfactor is ramped from zero to unity - this allows the inclusion of the quantum moments function to be introduced gradually into the equation set. A value of one represents a unity pre-multiplier on the quantum moments function.

With the Quantum model, the electron concentration will typically be quite different to classical prediction. This presents some difficulty for the program in terms of the initial estimate to the electron concentration. In classical simulations a very good initial estimate to the carrier concentration can be derived from the doping profile. However, with Quantum this is not always the case. Thus the quantum moments effect can be turned on gradually using the parameter qfactor . qfactor might need to be ramped from very small values to unity to obtain convergence for difficult problems.

To load and run this example, select the Load button in DeckBuild > Examples. This will copy the input file and any support files to your current working directory. Select the Run button in DeckBuild to execute the example.