Question

Why photodiodes are used in reverse bias not in forward bais?

Answer 1

A photo diode converts incident light to the electric current more effectively and with efficiency in reverse bias condition than in forward bias. Due to this reason they are always used in the reverse bias.

Answer 2

Answer:

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Explanation:

As fractional change in minority charge carriers is more than the fractional change in majority charge carriers, the variation in reverse saturation current is more prominent.