Menu

Discussion Forum

New Discussion
Filter

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

model a MOSFET in 3D

Posted Jun 29, 2010, 11:15 a.m. EDT 2 Replies

Sijing Han
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

I am trying to model a MOSFET in 3D. I know there is a 2D model in model library. In my 3D model, I applied similar boundary conditions and initial conditions to the 2D model, but the solution is not convergence. Can someone tell me how to model it correctly?

Thanks!
2 Replies Last Post Apr 30, 2013, 10:19 a.m. EDT
COMSOL Moderator

Hello Sijing Han

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

José Bustamante
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Nov 23, 2010, 12:06 a.m. EST
I have a similar problem. But mine is very silly in fact.

I have tried to create the library 2D model from scratch, using just the library guide, two times. I have also verified very closely that all parameters, constants, expressions, initial conditions are correct but the models won´t work. Strangely enough, I tried to run the file accompanying the guide ( COMSOL / ..../ mos_transistor.mph) and it works fine!!!

I tried to compare the settings of the original file with mine, and they are all the same! I just don't know why my model doesn't work.

I get these two errors, on the two files:


Error: 7052
Invalid degree of freedom in property Outcomp.
- Built-in function: javaMethod
- Callstack: femsolver 301 solobj.smartRunner(report, loopTime);
femstatic 35 varargout = femsolver(mfilename,'FemStatic',varargin{:});



Out of memory during LU factorization.
- Built-in function: javaMethod
- Callstack: femsolver 301 solobj.smartRunner(report, loopTime);
femnlin 98 varargout = femsolver(mfilename,'FemStatic',varargin{:});


My advise is to try to achieve something less ambitious than 3D before making an actual 3D model.

Any suggestions will be highly appreciated.

J

I have a similar problem. But mine is very silly in fact. I have tried to create the library 2D model from scratch, using just the library guide, two times. I have also verified very closely that all parameters, constants, expressions, initial conditions are correct but the models won´t work. Strangely enough, I tried to run the file accompanying the guide ( COMSOL / ..../ mos_transistor.mph) and it works fine!!! I tried to compare the settings of the original file with mine, and they are all the same! I just don't know why my model doesn't work. I get these two errors, on the two files: Error: 7052 Invalid degree of freedom in property Outcomp. - Built-in function: javaMethod - Callstack: femsolver 301 solobj.smartRunner(report, loopTime); femstatic 35 varargout = femsolver(mfilename,'FemStatic',varargin{:}); Out of memory during LU factorization. - Built-in function: javaMethod - Callstack: femsolver 301 solobj.smartRunner(report, loopTime); femnlin 98 varargout = femsolver(mfilename,'FemStatic',varargin{:}); My advise is to try to achieve something less ambitious than 3D before making an actual 3D model. Any suggestions will be highly appreciated. J
Farjallah Emna
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Apr 30, 2013, 10:19 a.m. EDT
I have the same problem
I have the same problem

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.

Suggested Content