SATHEE: semiconductor-electronics--materials-devices-and-simple-circuits Question 20

Semiconductor Electronics Materials Devices And Simple Circuits

semiconductor-electronics--materials-devices-and-simple-circuits Question 1
semiconductor-electronics--materials-devices-and-simple-circuits Question 2
semiconductor-electronics--materials-devices-and-simple-circuits Question 3
semiconductor-electronics--materials-devices-and-simple-circuits Question 4
semiconductor-electronics--materials-devices-and-simple-circuits Question 5
semiconductor-electronics--materials-devices-and-simple-circuits Question 6
semiconductor-electronics--materials-devices-and-simple-circuits Question 7
semiconductor-electronics--materials-devices-and-simple-circuits Question 8
semiconductor-electronics--materials-devices-and-simple-circuits Question 9
semiconductor-electronics--materials-devices-and-simple-circuits Question 10
semiconductor-electronics--materials-devices-and-simple-circuits Question 11
semiconductor-electronics--materials-devices-and-simple-circuits Question 12
semiconductor-electronics--materials-devices-and-simple-circuits Question 13
semiconductor-electronics--materials-devices-and-simple-circuits Question 14
semiconductor-electronics--materials-devices-and-simple-circuits Question 15
semiconductor-electronics--materials-devices-and-simple-circuits Question 16
semiconductor-electronics--materials-devices-and-simple-circuits Question 17
semiconductor-electronics--materials-devices-and-simple-circuits Question 18
semiconductor-electronics--materials-devices-and-simple-circuits Question 19
semiconductor-electronics--materials-devices-and-simple-circuits Question 20
semiconductor-electronics--materials-devices-and-simple-circuits Question 21
semiconductor-electronics--materials-devices-and-simple-circuits Question 22
semiconductor-electronics--materials-devices-and-simple-circuits Question 23
semiconductor-electronics--materials-devices-and-simple-circuits Question 24
semiconductor-electronics--materials-devices-and-simple-circuits Question 25
semiconductor-electronics--materials-devices-and-simple-circuits Question 26
semiconductor-electronics--materials-devices-and-simple-circuits Question 27
semiconductor-electronics--materials-devices-and-simple-circuits Question 28
semiconductor-electronics--materials-devices-and-simple-circuits Question 29
semiconductor-electronics--materials-devices-and-simple-circuits Question 30
semiconductor-electronics--materials-devices-and-simple-circuits Question 31
semiconductor-electronics--materials-devices-and-simple-circuits Question 32
semiconductor-electronics--materials-devices-and-simple-circuits Question 33
semiconductor-electronics--materials-devices-and-simple-circuits Question 34
semiconductor-electronics--materials-devices-and-simple-circuits Question 35
semiconductor-electronics--materials-devices-and-simple-circuits Question 36
semiconductor-electronics--materials-devices-and-simple-circuits Question 37
semiconductor-electronics--materials-devices-and-simple-circuits Question 38
semiconductor-electronics--materials-devices-and-simple-circuits Question 39

semiconductor-electronics--materials-devices-and-simple-circuits Question 20

Question: Q. 2. Mention the important considerations required while fabricating a $p-n$ junction diode to be used as a Light Emitting Diode (LED). What should be the order of band gap of an LED if it is required to emit light in the visible range?

R [Delhi I, II, III 2013]

Show Answer

Solution:

Ans. (i) It is a heavily doped $p-n$ junction diode.

(ii) The reverse breakdown voltages of LEDs are very low.

(iii) The semiconductor used for fabrication of visible LEDs must at least have a band gap of $1.8 \mathrm{eV}$.

(Any two) $1 / 2+1 / 2$

The order of band gap is about $3 \mathrm{eV}$ to $1.8 \mathrm{eV} . \quad \mathbf{1}$

[CBSE Marking Scheme 2013]

Semiconductor Electronics Materials Devices And Simple Circuits

semiconductor-electronics--materials-devices-and-simple-circuits Question 20

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

Semiconductor Electronics Materials Devices And Simple Circuits

semiconductor-electronics--materials-devices-and-simple-circuits Question 20

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

Menu