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How do I use the floating source potential?

Hi! I was trying to use the MOSFET version of FETTOY and would like to use the floating source potential. I noticed that I need to define the Equilibrium Source Carrier Concentration NSD2D. How do I calculate it? Is is simply the doping concentration of the source region? In that case what should be the unit? /m^3 ?

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    It is the sheet carrier density in the source – the number of dopants per cm2. For example, if the source doping is ND = 1e20 per cm3, and the source is 10 nm thick, the NSD2D = 1020 × 10-6 = 1014 per cm2.

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