CBSE Class 12 · 2000 · SemiconductorsShort Answer

Distinguish between p-type and n-type semiconductors on the basis of energy band diagram.

Solution

In an n-type semiconductor pentavalent donors create a filled donor level just below the conduction band; electrons are easily excited into the conduction band and are the majority carriers.
In a p-type semiconductor trivalent acceptors create an empty acceptor level just above the valence band; electrons move up into it leaving holes, which are the majority carriers.

n-type: donor level below CB; p-type: acceptor level above VB.

CBSE Class 12 Board · 2000 · Subjective

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