GATE EC 2019 Set 1 — Question 45
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Electronic Devices → Optoelectronic Devices → Photodiode Modes
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Question
The quantum efficiency () and responsivity () at a wavelength (in m) in a p-i-n photodetector are related by
Correct answer
(A) R = (× λ)/(1.24)
Solution
Responsivity is defined as the ratio of photocurrent to incident optical power:Substituting the constants J s, m/s, and C, and expressing in m:Thus, option (A) is correct.
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