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model a MOSFET in 3D

Posted 29 juin 2010, 11:15 UTC−4 2 Replies

Sijing Han
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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 30 avr. 2013, 10:19 UTC−4
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Hello Sijing Han

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José Bustamante
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Posted: 1 decade ago 23 nov. 2010, 00:06 UTC−5
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
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Posted: 1 decade ago 30 avr. 2013, 10:19 UTC−4
I have the same problem
I have the same problem

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