Question

Why we cannot take one slab of p type semiconductor?

Answer 1

hyy mates

A pn junction works if there is a continuous structure when joined.

If we physically join the two semiconductors, then there will always be very small microscopic gap or dicontinuity between the two because of roughness.

A p-type semiconductor has holes as majority carriers and the n-type semiconductor has electrons as majority. When a pn junction is formed, the holes from p and electrons from n move to the other type and hence, the width of the depletion layer widens.

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