Question

The potential barrier, in the depletion layer, is due to(a) Ions(b) Holes(c) Electrons(d) Both (b) and (c)

Answer 1

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option A is correct answer.....
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Answer 2

The potential barrier, in the depletion layer, is due to(a) Ions

Explanation :

The depletion layer is the region at the junction of a diode which is devoid of ions.  The potential barrier in the pn junction is the barrier which does not allow charge flow across the junction normally. This barrier is created by the charge present in the space charge region .When a p-type material is brought in contact to a n-type material charge flow across the junction takes place due to concentration gradient between the two sides (n and p type) .After some time the immobile ions are created near the contact which create electric field which opposes flow of current. This resistance to the flow of charge is known as barrier potential.