Use cases
Where Greater Today TCAD helps today.
Each example below uses capabilities in the current private build, and most start from an example deck that ships with it. Where a question needs physics we don't model yet, we say so.
01 · GaN power devices
Explore an AlGaN/GaN HEMT before committing to a run sheet.
Vary gate length, Al mole fraction and gate work function, then read threshold voltage, transconductance, on-resistance, 2DEG density and an off-state breakdown estimate from each run.
- Starts from
gan_hemt.deckor the built-in template - Transfer, output and off-state sweeps in one deck
- Search for the gate length with the highest gm above a breakdown floor
No self-heating, contact resistance or current collapse yet, so absolute currents run high. Use it for trends and comparisons.
"How does Al fraction trade threshold voltage against 2DEG density?"
Sweep xal between 0.1 and 0.45 and compare up to four runs side by side.
02 · Gate-stack choices
Pick a dielectric and bias that hit a target current.
Target search treats material choices as variables alongside numeric ones. Ask for a drain current at a stated bias, set a tolerance, and the search reports whether any trial met it.
- Starts from
nmos_dielectric_choice.deck(SiO₂ or HfO₂) - Explicit metric, units, bias and tolerance
- Refine from the best trial with the same settings
"Which dielectric and gate voltage give Id = 300 mA/mm?"
If no trial is within tolerance, the closest one is shown and the study is reported as not met.
03 · Teaching device physics
A device lab that runs in a browser.
Students write a short deck, see the structure, and get band diagrams, 2D maps and I–V curves. There's nothing to install and no workstation licence to manage.
- A readable deck instead of a GUI-only setup
- Errors point to the exact line
- Every run keeps its inputs, so work can be checked
"Show how oxide thickness moves Vth and subthreshold swing."
Change tox in si_nmos.deck, run twice and overlay the transfer curves.
04 · Early-stage screening
Narrow the design space quickly.
For a small team, setting up a full commercial flow for every what-if is slow. Greater Today TCAD is built for quick first passes: decide which few designs deserve careful simulation and measurement.
- Bayesian search over one to three variables
- Constraints on any extracted metric
- Downloadable CSV, JSON and solver logs for your own tools
"Which three of these twenty variants are worth a closer look?"
Confirm the shortlist with established tools and measured data before relying on it.
Not a fit yet
Questions we can't answer well today.
RF small-signal and transients
Only DC analyses exist. No AC, fT/fmax, switching transients or trap dynamics.
Thermal and reliability
No self-heating, avalanche feedback or degradation models.
3D or sign-off
2D rectangular structures only, and results aren't calibrated to measured devices.
Have a device question?
Tell us what you're trying to decide. We'll tell you honestly whether Greater Today TCAD can help yet.