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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 materialI 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

Answer»

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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