Question: Q. 3. Why is photodiode used in reverse bias ?
R [OD Comptt. I, II, III 2013]
Solution:
Ans. In forward bias, current is mainly due to major carriers while in reverse bias, current is due to minor carriers. With such fractional change in reverse current resulting from photo effects, it can be easily measured as in case forward bias current. Hence, the photodiodes will operate in reverse bias.
[CBSE Marking Scheme 2013]
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