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Simulation of semiconductor electric potential

Posted 2011年4月6日 GMT-4 04:54 Materials Version 4.0, Version 5.2 2 Replies

rui 王
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Hi all,
Now I am simulating of electric potential. Simply I will solve Poisson equation in different medium. Support I have two medium and they are connected. So there is a interior boundary condition at the junction. There are charges in this junction so I have the Neumann boundary condition like this: D1-D2=ro. I think this is a discontinuous boundary condition. In my model, the space charge density is a function of electric potential V, which means this is a nonlinear Poisson equation. I select the general PDEs to solve this model, but the problem is that how to set the discontinuous boundary condition in the junction: D1-D2=ro.
I look for the USR ´S GUIDE, there are some words on PAGE 477 describe this, but the problem is that I really do not know how to set this discontinuous conditions.
Also in ACDC MODUL >electrostatics, I can set this discontinuous boundary condition, but the other problem is that I can only set space charge density as a constant, but can not set it as a function of electric potential V
I am using COMSOL 4.0
Thanks,
Yan
2 Replies Last Post 2017年1月26日 GMT-5 09:12
COMSOL Moderator

Hello rui 王

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高天 鹿
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Posted: 8 years ago 2017年1月21日 GMT-5 07:23
Hi，
Do you solve the problem now？ I am learning Comsol and meet a similar problem. Could you offer some suggestions？
Thank you

Gaotian Lu
Hi， Do you solve the problem now？ I am learning Comsol and meet a similar problem. Could you offer some suggestions？ Thank you Gaotian Lu
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 2017年1月26日 GMT-5 09:12
Hello,
Discontinuous conditions on internal boundaries can in fact be modeled with COMSOL. Depending on the particular physics you are modeling and which products your license includes, such internal boundary conditions may be ready right out of the box or require a bit more work to set up.
A tutorial that shows how to "manually" set up a discontinuous internal boundary condition is found here:
www.comsol.com/model/separation-through-dialysis-258
Best regards,
Jeff
Hello, Discontinuous conditions on internal boundaries can in fact be modeled with COMSOL. Depending on the particular physics you are modeling and which products your license includes, such internal boundary conditions may be ready right out of the box or require a bit more work to set up. A tutorial that shows how to "manually" set up a discontinuous internal boundary condition is found here: https://www.comsol.com/model/separation-through-dialysis-258 Best regards, Jeff

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

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