3D AlGaN/GaN HEMT Including Intrinsic Stress Effect

ganfetex13.in : 3D AlGaN/GaN HEMT Including Intrinsic Stress Effect

Requires: Victory Stress/Blaze
Minimum Versions: Victory Stress 2.22.4.R, Atlas 5.28.1.R

This example demonstrates:

  • Construction of the 3D heterojunction structure
  • 3D Stress simulation, Material and models parameter specification
  • 3D Simulation of Id/Vgs characteristics and comparison with 2D for validation

The device under consideration is a 3D AlGaN/GaN HEMT. The 2D structure is first obtained by Athena and then extruded in 3D using DEVEDIT. This is in fact the structure created in ganfetex05. 3D stress distribution is simulated by VICTORYSTRESS. This example produces stress distributions via the stress-liner made of nitride. Note that the stressor in this example is used to illustrate strain polarization, on top of lattice and spontaneous polarization.

The polarization model that supports dependency on loaded strain tensor has been used in this example. The model is enabled by the POLARIZATION flag of the MODELS statement.

The main concept of GaN based power devices is to use epitaxial strain to create 2DEG. The polarization model that supports epitaxial strain due to lattice mismatch is enabled by the CALC.STRAIN flag on the MODEL statement.

When both models are set in the simulation both the imported strain and the lattice mismatch calculation are accounted for.

The lattice and imported strain dependent components of polarization can be independently scaled using the scale factors TENSO.SCALE and PIEZO.SCALE on the MODEL statement.

When enabling the POLARIZATION flag spontaneous polarization is automatically included in the calculation. The size of the spontaneous component can be scaled using the PSP.SCALE parameter of the MODELS statement.

After the initial solution is obtained the drain voltage is ramped to 1 V, then the IdVg characteristic is extracted from Vg=-8 to Vg=1.0 V.

The effect of strain is seen on IdVg characteristic. Overlay of 2D simulation results with 3D simulation results obtained with width=1 validates our 3D implementation.

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.