PN optical modulator

Hello,

I am a student in TUD and I have started to work with COMSOL. My task is to model and simulate PN silicon optical modulator.
I am using Semiconductor module. I have couple of questions I would highly appreciate if you help me with that.

My structure consists of p+, p, n and n+ regions I am using metal contacts on p+ and n+ regions and applying voltage. I have also added "Trap assisted recombination" and "Auger recombination" physics. Do I need some more physics ?


1) I am a bit confused with the doping profiles in COMSOL. Currently I am using Analytic doping profile and using "user defined" distribution for all the parts in my structure. Is this correct approach ?

2) I need also to calculate the resistance and capacitance of my structure. Is it possible with comsol ? if yes how can I do that ?

3) I need to extract carrier distribution in txt file. So I am doing it from 2D figure and I have x y and value(color). But I would like to control x and y. I mean to say I want for example 1000 x and 500 y. Is it possible ?

Thank you in advance.
Best regards,
Levon