Statement I: In a semiconductor diode, the reverse biased current is due to drift of free electrons and holes.
Statement II: The drift of electrons and holes is due to thermal excitations.
In the light of the above statements, choose the most appropriate answer from the options given below.
Text Solution
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Both Statement I and Statement II are correct.
A reverse bias on a 
junction opposes the movement of the majority charge carriers thus stopping the diffusion current. It makes the free electrons and holes to drift across the junction. Therefore, a small current in 
flows even when the 
junction is reverse biased. The drift current is due to the thermal excitations of the electrons and holes.
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