Guidance for Adding New Material for GaAs MESFET Simulation

models
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Hello DEVSIM Community,

I am currently working on a project to design and simulate a Gallium Arsenide (GaAs) based MESFET. I plan to use DEVSIM for the simulation, but I am facing challenges in incorporating GaAs as a new material in the tool.

Could anyone provide guidance or examples on how to define the necessary material parameters for GaAs (like electron mobility, effective mass, dielectric constant, etc.) in DEVSIM? I am particularly looking for information on how to accurately integrate GaAs material properties into the simulation framework.

Additionally, if there are any example scripts, documentation, or previous projects related to GaAs MESFET simulations in DEVSIM, sharing these would be incredibly helpful. Also, any tips or special considerations to keep in mind while working with GaAs in DEVSIM would be greatly appreciated.

Thank you in advance for any assistance or resources you can provide. Your support is crucial for the advancement of my project.

Best regards,

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HI @bugratufan

Welcome to the forum. Please feel free to ask any questions you may have.

Starting with the material properties, the simple physics models just require setting the parameters for mobility, temperature. For example, mu_n, mu_p, n_i, taun, taup for your material. The default unit for length is cm, and densities are cm^-3. However, you are free to use whatever unit you want as long as it is consistent with the assumed length unit in your mesh.

Adding additional mobility models is certainly possible using the scripting language. For example, please see:

https://github.com/devsim/devsim_bjt_example

and its accompanying document:

https://github.com/devsim/devsim_bjt_example/blob/main/doc/devsim_bjt_example.pdf

Regards,

Juan

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Please note if you need similar models to a HEMT simulation (2DEG, schottky gate), @ghost is working on these type of models.

Boundary setting for the surface charge

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Thank you so much for the information and resources you’ve provided, @Juan

The post from @ghost and your answers look like a great starting point for my work. Thank you for sharing this valuable information.

I’ll update you about the outcomes and progress of my work.

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Hello, bugratufan!
The material parameters and models is convenient to define in DEVSIM. My setting and models are most referred to the commercial or opensource TCAD guidance. I upload two guidance in Git:
https://github.com/ZhenglaiT/HEMT-simulation/blob/main/reference/Clara%20-%20DEVICE%20SIMULATION%20SOFTWARE.pdf
They help me a lot. The GaAs models in Silvaco is in part 6.4.3.
I am not familiar with the MESFET, but the Schottky gate setting could referred to QsChen’ sharing. I also write some code about it in the Git. Please discuss with me if you have any questions.