Multiple choice

A MOS capacitor is made using p-type substrate in the accumulation mode. The dominant charge in the channel is due to the presence of

  1. holes

  2. electrons

  3. positively charged ions

  4. negatively charged ions
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A Correct answer
Explanation

In accumulation mode for NMOS having p - substrate, when positive voltage is applied at the gate, this will induce negative charge near p - type surface beneath the gate. When VGS is made sufficiently large, an inversion of electrons is formed and this in effect forms an n - channel.

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