Question

I - V characteristics of photodiode for different illumination intensities \( I_1, I_2, I_3, I_4 \) are drawn as follows. Then the maximum intensity among them is

• A. \( I_1 \)
• B. \( I_2 \)
• C. \( I_3 \)
• D. \( I_4 \)

Hint:

Photodiodes are always operated in reverse bias mode to detect light intensity.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
A photodiode operates in reverse bias. The reverse saturation current is directly proportional to the incident light intensity.
Step 3: Detailed Explanation:
In the given characteristic graph, the reverse current (measured in \( \mu\text{A} \) on the negative y-axis) increases in magnitude as the light intensity increases.
Curve \( I_4 \) shows the highest magnitude of current for any given reverse voltage.
Therefore, curve \( I_4 \) corresponds to the highest light intensity.
Step 4: Final Answer:
The maximum intensity is \( I_4 \).