Please refers to this article: Troubleshooting convergence errors in CHARGE
Diverging in CHARGE is complicated. You may need to further modify the contstraints and the number of iteration.
I am not sure I understand the last item. reducing sensitivity will refine the mesh. Maybe you can stick at high sensitivity.
SENSITIVITY: This setting controls the threshold at which the mesh will be refined due to the gradient in the doping density or optical generation rate. The default value will roughly correspond to a limit of a factor of 2 change in the doping density or generation rate over the span of an element in the mesh.
Is this simulation at 0 v? if not, please reduce the voltage step, and initial voltage if it is not zero.
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