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Quantum efficiency of a photodiode (ratio between the number of liberated electrons and the number of incident photons) is 0.75 at 830 nm. Given Planck’s constant h = 6.624 × 10-34 J-sec, the charge of an electron e = 1.6 × 10-19 C and the velocity of light in the photodiode Cm = 2 × 108 m/s. For an incident optical power of 100 μW at 830 nm, the photocurrent in μA is __________.
Correct answer is between '74.5,75.5'. Can you explain this answer?
Most Upvoted Answer
Quantum efficiency of a photodiode (ratio between the number of libera...
Given:
η = 0.75
λ = 830 nm
h = 6.626 x 10-34 J-sec
e = 1.6 x 10-19 C
cm = 2 x 108 m/s
Pin = 100 μW
Concept:
The ratio of output current to input power is given by Responsivity

Calculation:

I = 75.18 μA
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Quantum efficiency of a photodiode (ratio between the number of liberated electrons and the number of incident photons) is 0.75 at 830 nm. Given Planck’s constant h = 6.624 × 10-34 J-sec, the charge of an electron e = 1.6 × 10-19 C and the velocity of light in the photodiode Cm = 2 × 108 m/s. For an incident optical power of 100 μW at 830 nm, the photocurrent in μA is __________.Correct answer is between '74.5,75.5'. Can you explain this answer?
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