Modeling 2D electron gas

hello. I am working on 2 D electron gas structure in semiconductor junction… but I am getting convergence issues at some applied voltages.

I am attaching my device here
vishal lumeric device new.ldev (6.3 MB)
it should work like HEMT structure in which it should form and modulate 2 D electron gas with voltage. now I have got rid of convergence but 2 D electron gas is still not forming as is visible by the conduction band structure.

Hi @phd1601202001, The doping level in your device is so large that currently all of the applied voltage is dropping across the substrate. This is why you do not see any effect of the applied bias on the energy band. Besides that the band profile looks fine to me with all the proper heterojunctions.