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Electrostatics and Transport of dilute species

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Hi all,

I am modelling a pn junction using the coupled electrostatic and transport of dilute species physics module for weeks now without any success. I followed the model in tutorial provided on comsol model gallery but encountered the following problems:
(1) I got an I-V plot for the model but when I plot current density as function of applied voltage, it gives 0 A/m^2 at any applied voltage which is strange.
(2) I do not fully understand the expression for cathode current (Ic) used in the tutorial. what does the Lagrange multipliers cn_lm and cp_lm do in Ic expression.
(3) After perturbing the system by including the generation term, I did not see any change in the I-V plot.
(4) Even when I set the recombination and generation term to zero, I still get I -V plot...I am confused about this.

Please, can someone help me out? I attached my file below.

Thanks


1 Reply Last Post May 13, 2013, 11:30 a.m. EDT
Daniel Smith COMSOL Employee

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Posted: 1 decade ago May 13, 2013, 11:30 a.m. EDT
Hi, we have just released a Semiconductor Module which makes it much easier to model PN junctions:

www.comsol.com/products/semiconductor/

I recommend trying this product to solve your problem.
Hi, we have just released a Semiconductor Module which makes it much easier to model PN junctions: http://www.comsol.com/products/semiconductor/ I recommend trying this product to solve your problem.

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