Question

A MOS capacitor made using p type substrate is in the accumulation mode. The
dominant charge in the channel is due to the presence of
(A) holes (B) electrons
(C) positively charged icons (D) negatively charged ions

Answer 1

Answer:

holes is the answer option A

Answer 2

A. The dominant charge in the channel is due to the presence of holes.

The P-type substrate is in the accumulation mode:

• When the gate voltage is –ve, a MOS capacitor with a p-type substrate functions in Accumulation mode.
• Important note: when VG = +ve and small, you're in depletion mode.
• The four modes of operation of a MOS structure are discussed in the following sections.
• Flat band, Depletion, Inversion, and Accumulation.

Accumulation mode or layer:

• When a voltage lower than the flat band voltage is applied, accumulation occurs.
• Holes from the substrate are drawn to the oxide-semiconductor contact by the negative charge on the gate.