I have designed and simulated a FinFET based biosensor for sensing biomolecules with high dielectric constant (k) i.e. k ranging from 2-10 with the help of Silvaco Atlas. The simulation of FinFET biosensor is converging and working fine when the cavity is filled with air i.e. when k=1. However, when the cavity is filled with high k biosensor molecules the simulation is not converging although we have adjusted the meshing and used electric field dependent mobility and transport models and other recombination and tunneling models for the simulation. We have used the Newton and Gummel methods to solve the models in the simulation. Can anyone give me his/her most valuable suggestions to resolve out the problem issue?
I am not familiar with Silvaco, and it is hard to provide meaningful suggestions without looking at the project and the errors reported !
However, consider not using all physics models at once, especially the tunneling. Increase the complexity of the models until it diverges. That is assuming that your mesh is good.
On the process, use a regular high-k in Silvaco (do not create your own material), then sweep its primitivity.
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