I would like to plot the 2DEG concentration of a GaN HEMT in cm^-2 as a function of Vgs(V) in Silvaco. So far I have used the built-in polarization models and obtained the electron concentration in cm^-3 along the y-axis. But I need to obtain this curve as a function of Vgs. One solution is that I solve it for different Vgs as below
solve init
solve vgate=-1
save outf=ganfetex03_0.str
solve init
solve vgate=-2
save outf=ganfetex03_0.str
and save the results and then use the values at a specific point in the 2DEG and plot them in MATLAB vs Vgs. But then will the unit be cm^-2 rather than cm^-3 which is already shown in TonyPlot using a cutline?
The other ambiguity is the position of the point of interest in the 2DEG.
Any suggestions would be appreciated.
The electron concentration one can get by taking the vertical cut line (mostly below the gate) will be in cm^3. So if you take the area of the curve (e concentration [cm^3] versus depth [cm]) you will get the electron concentration in per cm^2 unit. The same you can repeat for other gate biases to get 2DEG for different bias conditions.
1. 2DEG is not measured in cm^3. It is 2D parameter, so it is measured in cm^2
2. You save the structure filse for different Vgs, then you go for vertical cut of these structure files.
I think you might have got the solution by now. Still, you can check out below GaNFET examples given in deckbuild. It keeps AlGaN thickness as variable and extracts 2DEG vs. thickness. You can tweak the same code to get the value vs. Vgs.
https://silvaco.com/examples/tcad/section14/example1/index.html
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