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For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0? (Read 4162 times)
mpig09
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For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0?
May 25th, 2017, 5:47pm
 
Hi all:

Many books explain the MOS Cap value is Cox(oxide cap) serial Cdep(depletion cap) when VFB < VGB < VTH,
I have a questions: is there a depletion region in MOS when VFB < VGB < 0?

VFB : Flat band voltage

If Yes, could you help me to understand it.

Thank.

mpig
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Maks
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Re: For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0?
Reply #1 - May 27th, 2017, 1:58pm
 
There is always depletion region when Vg > VFB.
At Vg> Vt though, the depletion regions is "screened" (or shielded) by the inversion layer (a thin layer of electrons in the channel, at the Si/oxide interface, supplied from N+ source/drain regions).

If you want to understand what all these terms mean - depletion, deep depletion, accumulation, inversion - you can read any textbook on semiconductor device physics (for example, S.Sze book "Physics of semiconductor devices").

Max
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mpig09
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Re: For MOS Cap, is the a depletion region in MOS when VFB < VGB < 0?
Reply #2 - Jun 5th, 2017, 2:49am
 
Hi Max:

I have solved the problem.
Smiley

mpig
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