Question

Differentiate between extrinsic n-type and p-type semiconductors; discuss their importance in a p-n junction diode.

Answer 1

In n-type semiconductor, we dope intrinsic semiconductor with pentavalent atoms like arsenic, antimony so that we can get an excess electron as free career for this semiconductor. So in n-type semiconductor the majority carrier is electron.

On the other hand, in p-type semiconductor we dope intrinsic semiconductor with trivalent atoms so that we can get a hole as the majority carrier here.

Now, for a pn junction diode we make it by making one part p-tyoe and other part n-type and thus current only flows in one direction (mostly). And we get a vulve like circuit which is the main reason to do that.