GATE EC 2016 Set 3 — Question 21
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Electronic Devices → MOS Capacitor & MOSFET → MOS Capacitor (Accum, Depl, Inv)
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Question
The figure shows the band diagram of a Metal Oxide Semiconductor (MOS). The surface region of this MOS is in
Correct answer
(A) inversion
Solution
In the bulk of the semiconductor (right side), the intrinsic Fermi level is above the Fermi level , indicating a p-type substrate. At the surface (near the interface), the bands bend downwards, moving closer to . Since is still above at the surface but the hole concentration is reduced compared to the bulk, the surface is in depletion. If had crossed below , it would be in inversion. If the bands bent upwards, it would be in accumulation.
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