The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because:
- fractional change in majority carriers produce higher forward bias current.
- fractional change in majority carriers produce higher reverse bias current.
- fractional change in minority carriers produce higher forward bias current.
- fractional change in minority carriers produce higher reverse bias current.
The Correct Option is D
Solution and Explanation
A photodiode operates under reverse bias conditions, and when illuminated, it generates charge carriers. The fractional variation in minority carriers is significant due to the initial current being extremely low.
So, the correct option is (D): fractional change in minority carriers produce higher reverse bias current.
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Concepts Used:
P-n Junction
A P-N junction is an interface or a boundary between two semiconductor material types, namely the p-type and the n-type, inside a semiconductor.
Biasing conditions for the p-n Junction Diode:
in p-n junction diode two operating regions are there:
- P-type
- N-type
There are three biasing conditions for p-n junction diode are as follows:
- Zero bias: When there is no external voltage applied to the p-n junction diode.
- Forward bias: P-type is connected to positive terminal of the voltage potential while n-type is connected to the negative terminal.
- Reverse bias: P-type is connected to negative terminal of the voltage potential while n-type is connected to the positive terminal.