SATHEE: semiconductor-electronics--materials-devices-and-simple-circuits Question 34

सेमीकंडक्टर इलेक्ट्रॉनिक्स सामग्री उपकरण और सरल सर्किट

Question: Q. 13. (i) How is a photodiode fabricated?

(ii) Briefly explain its working. Draw its $I - V$ characteristics for two different intensities of illumination. U [Foreign 2014; Delhi I, II, III 2013]

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Solution:

Ans. (i) Photodiode is fabricated with a transparent window to allow light to fall on the diode.

(ii) (a) Working : When a reverse biased photodiode is illuminated with the light of energy greater than the forbidden energy gap $(E_{g})$ , the electronhole pairs are generated in, or near, the depletion region. Due to junction field, electrons collected on the $n$ -side and holes on $p$ -side, giving rise to a potential difference.

(b)

[CBSE Marking Scheme 2013] 1

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