Question:
Identify the INCORRECT statement
Identify the INCORRECT statement
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Dark current flows even without light and is caused by thermally generated minority carriers.
Updated On: Nov 12, 2026
- Dark current in photo diode flows only when the photodiode is reverse biased.
- Dark current in photo diode is caused by minority carriers flowing across the junction.
- Dark current in a photo diode is a small current, typically in the range of picoampere or nanoampere.
- Dark current in photo diode is only caused by external background radiation.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Dark current is the small reverse leakage current of a photodiode when no light falls on it.
Step 2: Check the statements
It flows only under reverse bias. True.
It is due to minority carriers crossing the junction. True.
It is very small, in the pA to nA range. True.
Step 3: The incorrect statement
Dark current exists in complete darkness and is thermal in origin. It is not caused by external background radiation, so option D is incorrect.
Final Answer:
The incorrect statement is that dark current is only caused by external background radiation. \[ \boxed{\text{(D) }\text{Dark current in photo diode is only caused by external background radiation.}} \]
Dark current is the small reverse leakage current of a photodiode when no light falls on it.
Step 2: Check the statements
It flows only under reverse bias. True.
It is due to minority carriers crossing the junction. True.
It is very small, in the pA to nA range. True.
Step 3: The incorrect statement
Dark current exists in complete darkness and is thermal in origin. It is not caused by external background radiation, so option D is incorrect.
Final Answer:
The incorrect statement is that dark current is only caused by external background radiation. \[ \boxed{\text{(D) }\text{Dark current in photo diode is only caused by external background radiation.}} \]
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