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In a p-n junction, the valence band edge of the p material is greater than which of the following band?

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In a p-n junction, the valence band edge of the p material is greater than which of the following band?

(a) Conduction band edge of n material

(b) Valence band edge of n material

(c) Conduction band edge of p material

(d) Fermi level of p material

I had been asked this question during an online interview.

The above asked question is from Band Structure of an Open-Circuited p-n junction in chapter Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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The correct answer is (b) Valence band edge of n material

Easy explanation: When the p-n junction is formed, the energy levels of the p- material go higher than the n material. That’s why the valence band of the p material will be greater than that of the n material.

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