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Grade: 12
        The current in forward bias is known to be more than the current in reverse se bias. What is the reason then to operate the photodiodes in reverse bias?(This is an ncert example,14.6. Is there any other approach to this question?)
10 months ago

Answers : (1)

Arun
15787 Points
							The photodiode is reverse biased for operating in the photoconductive mode. As the photodiode is in reverse bias the width of the depletion layer increases. This reduces the junction capacitance and thereby the response time. In effect, the reverse bias causes faster response times for the photodiode. The photocurrent is linearly proportional to the illuminance.
						
10 months ago
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