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Define conductivity for a dielectric domain in Electrostatics

Posted 29.07.2020, 11:55 GMT-4 Low-Frequency Electromagnetics Version 5.5 1 Reply

Yemin Tang
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Hi,

I am using comsol 5.5 electrostatics module. I use it to extract capacitance between different terminals.

I came across a problem where a Si (silicon) block domain needs to be defined in the electrostatics node between two terminals. The relative permitivity is used in this node. But it's also a doped silicon which has low resistance that acts as a conductor. However, electrostatics node is not accounting for this.

May I know how can I incorporate Silicon's electrical conductivity? Shall I couple another AD/CD sub module to do this?

Attached is an image, and the COMSOL file.

Thanks, Stacey

1 Reply Last Post 29.07.2020, 14:14 GMT-4
Edgar J. Kaiser Certified Consultant
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Posted: 4 years ago 29.07.2020, 14:14 GMT-4

Hi,

you must use electric currents (ec) then. Make sure that all domains also the insulators have a very small conductivity, otherwise the solver will not converge.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi, you must use electric currents (ec) then. Make sure that all domains also the insulators have a very small conductivity, otherwise the solver will not converge. Cheers Edgar

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