I'm performing a simple TCAD simulation in Sentaurus 2D Device. As long as I was using Hydrodynamic transport, Lombardi model and SRH recombination, my simulations were converging. Now, when I added density gradient model, my simulation does not converge because of a large |RHS|. I'm doing 20 iterations, InitialStep=1e-3 Increment=0.01 MinStep=1e-5 MaxStep=0.1 targeted to 0.8V. How can I have a successful convergence?
Your corrections represent an optimum strategy, but I would suggest you to try also to gradually increase the mesh-spacing in order to test whether the number of converging iterations increases too or not.
Thanks Marco. I achieved convergence of my simulations by using line search damping and tweaking the increment and step values.
Very good! Newton's method parameters, as well as mesh refinement, represent always the key to achieve the convergence!
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