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MOSFET Device Physics and Operation

1 MOSFET Device Physicsand INTRODUCTIONA field effect transistor (FET) operates as a conducting semiconductor channel with twoohmic contacts thesourceand thedrain where the number of charge carriers in thechannel is controlled by a third contact thegate. In the vertical direction, the gate-channel-substrate structure (gate junction)can be regarded as an orthogonal two-terminaldevice, which is either a MOS structure or a reverse-biased rectifying Device that controlsthe mobile charge in the channel by capacitive coupling (field effect).

independent of the biasing conditions. However, between the semiconductor and the metal contact, the Fermi level is shifted by E Fm – E Fs = qV (see Figure 1.3(b)). Hence, we have a quasi-equilibrium situation in which the semiconductor can be treated as if in thermal equilibrium. A MOS structure with a p-type semiconductor will enter the ...

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