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Which of the following is true in case of an unbiased p-n junction diode?

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in Power Electronics by (27.1k points)
Which of the following is true in case of an unbiased p-n junction diode?

(a) Diffusion does not take place

(b) Diffusion of electrons & holes goes on infinitely

(c) There is zero electrical potential across the junctions

(d) Charges establish an electric field across the junctions

The question was posed to me during an internship interview.

My question is from The P-N Junction topic in section Diodes of Power Electronics

1 Answer

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by (45.1k points)
Right option is (d) Charges establish an electric field across the junctions

To explain: A potential difference is established across the junctions due to recombination of holes & electrons. This growing filed (barrier potential) stops the further diffusion.

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