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What causes drift current in a p-n junction diode?(a) Electric field(b) Charge carriers density(c) Collision of electrons(d) Electric potentialThis question was posed to me during an internship interview.This is a very interesting question from Semiconductor Electronics topic in chapter Semiconductor Electronics : Materials, Devices and Simple Circuits of Physics – Class 12

Answer»

The correct CHOICE is (b) Charge CARRIERS density

The EXPLANATION: Drift current is due to the high concentration of holes in the p-region and the high concentration of electrons in the n-region of the junction diode. The combined effect of the MOVEMENT of minority charge carriers results in drift current.



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