Exam-style question
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Explain how the intensity of light affects the photocurrent in a photodiode.
Model answer
What a good answer should say
- The photocurrent in a photodiode increases with the intensity of light because a higher light intensity results in more photons being absorbed, which generates more electron-hole pairs.
- This leads to a greater flow of current through the diode.
Explanation
Why this works
This answer is strong as it clearly links light intensity to photocurrent generation, demonstrating an understanding of the relationship between light and electrical output in photodiodes. The question assesses the student's ability to connect concepts in semiconductor physics.
Common mistake
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