JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Modern Physics

With increasing biasing voltage of a photodiode, the photocurrent magnitude:

(A)remains constant
(B)increases initially and after attaining
(C)increases linearly
(D)increases initially and saturates finally✓ Correct

Answer: (D)

Solution

A photodiode is run in reverse bias, where light frees electron-hole pairs that make up the photocurrent. As the reverse voltage is raised, the current climbs at first because more of the photogenerated carriers are swept across the junction, but once essentially all of them are being collected, raising the voltage further liberates no extra carriers and the current levels off. The photocurrent therefore increases initially and then saturates.

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Single correct option

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