Discussion
Assertion (A) : PIN diodes have wider depletion region, in order to allow light to penetrate more deeply in the semiconductor material.
Reason (R) : III-V semiconductor materials are used to fabricate in order to allow shorter wavelength in the region of 400-700 nm.
Answer: C
The Assertion is true and the Reason is false, option (C). A PIN diode has an intrinsic layer, which gives a wider depletion region and allows light to penetrate more deeply into the semiconductor.
The Reason is wrong, because III-V materials are used to make devices for longer wavelengths in the infrared, which silicon does not cover, and not for shorter wavelengths of 400 to 700 nm. Options A and B need a true Reason and option D a false Assertion.
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