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Which of the following accounts for the presence of the potential barrier in the depletion layer?

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in Physics – Class 12 by (135k points)
Which of the following accounts for the presence of the potential barrier in the depletion layer?

(a) Ions

(b) Holes

(c) Electrons

(d) Forbidden band

This question was addressed to me during a job interview.

I want to ask this question from Semiconductor Electronics in chapter Semiconductor Electronics : Materials, Devices and Simple Circuits of Physics – Class 12

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The correct answer is (a) Ions

Easiest explanation: The potential barrier in the depletion layer is due to the presence of immobile ions. The acceptor and donor atoms will gain negative and positive charges leading to p-n junction formation. Hence, acceptor and donor are immobile ions.

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