Question

(a) Three photo diodes D1, D2 and D3 are made of semiconductors having band gapsof 2.5 eV, 2 eV and 3 eV respectively. Which of them will not be able to detectlight of wavelength 600 nm ?
(b) Why photodiodes are required to operate in reverse bias ? Explain.

Answer 1

Explanation:

The photodiode is reverse biased for operating in the photoconductive mode. As the photodiode is in reverse bias the width of the depletion layer increases. This reduces the junction capacitance and thereby the response time. In effect, the reverse bias causes faster response times for the photodiode.

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Answer 2

Answer:

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Explanation:

As fractional change in minority charge carriers is more than the fractional change in majority charge carriers, the variation in reverse saturation current is more prominent.