Hi @r05941061, can you check what your doping profile looks like. Also, please double check if the doping dependent mobility model is turned on (just in case). To test the model, I created a simple pin structure (test_pin.ldev (5.9 MB)
) and checked the mobility value. Please see the screenshot below:
You can see that the mobility is high in the low doped region (center) and has a very low value in the heavily doped p and n regions.
A final thing to check would be the version of your DEVICE. If you are not using the latest version then I would recommend upgrading to the latest version just to make sure it is not due to some old issue that has been resolved in a newer version. You can get the installer for the latest version here: https://www.lumerical.com/downloads/customer.html.