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

Semiconductor Electronics Materials Devices And Simple Circuits

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

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]

Show Answer

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 $\left(E_{g}\right)$, 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

Semiconductor Electronics Materials Devices And Simple Circuits

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

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Engineering Preparation

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Semiconductor Electronics Materials Devices And Simple Circuits

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

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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