MOS Capacitor

[Confused Soul]

Hello Everyone,

I wanted to know is there any way we can find the Threshold Voltage
(Vt) and Flatband Voltage (Vfb) of a MOS capacitor from the CV
characteristics of the MOS capacitor?

Thanks
ConfusedSoul

 

[Mantra]

"Confused Soul" <confused.mind@gmail.com> wrote in message news:<1096521840.683522.211960@h37g2000oda.googlegroups.com>...

Hello Everyone,

I wanted to know is there any way we can find the Threshold Voltage
(Vt) and Flatband Voltage (Vfb) of a MOS capacitor from the CV
characteristics of the MOS capacitor?

Thanks
ConfusedSoul

Vt only has meaning for a MOS*FET* but not a MOS*CAP*. It's a bit
frightening if you don't already know that.

You can measure Vfb using quasi-static (LF) CV and high-frequency CV
plots. Strictly there are more variables than unknowns even then
(flat band is a bit of a idealized theoretical concept rather than a
real measureable phenomena) but you can get a usable value for
engineering purposes. Again this is basic MOS theory 101 - first week
of class, no less.

Agilent, nee Hewlett-Packard, (e.g. 4140B/42XX) and Keithley make the
appropriate instruments for this.

MM