✓ Board-verified
Physics · 2022 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic Semiconductor2 marksApplyvery short answer
CBSE 2022 · Region 1 · Set 1 · Q1
Draw energy band diagrams of n-type and p-type semiconductors at temperature T > 0K, depicting the donor and acceptor energy levels. Mention the…
Draw energy band diagrams of n-type and p-type semiconductors at temperature T > 0K, depicting the donor and acceptor energy levels. Mention the significance of these levels.
Marking-scheme solution
(a)
$\displaystyle T>0 \mathrm{~K}$
one thermally generated electron-hole
pair +$\displaystyle 9$ electrons from donor atoms
n-type
p-type
Significance
n-type semiconductors - small energy gap between donor level and conduction band which can be easily covered by thermally excited electrons.
p- type semiconductors - small energy gap between acceptor level and valence band which can be easily covered by thermally excited electrons.
Alternatively
The conductivity of semiconductor is improved with the creation of donor and acceptor levels.
All Semiconductor Electronics: Materials, Devices and Simple Circuits questions2022 question paperNCERT solutions: Semiconductor Electronics: Materials, Devices and Simple CircuitsPractice Semiconductor Electronics: Materials, Devices and Simple Circuits →
More from Semiconductor Electronics: Materials, Devices and Simple Circuits
- With the help of a circuit diagram, explain the working of a p-n junction diode as a full-wave rectifier. Also draw its input and output waveforms.2022 · asked 2×
- State the working principle of an LED. Write any two important advantages and two disadvantages of LED.2022
- What are majority and minority charge carriers in an extrinsic semiconductor? A p-n junction is forward biased. Describe the movement of the charge…2025
- Draw the circuit diagrams for obtaining the V-I characteristics of a p-n junction diode. Explain briefly the salient features of the V - I…2024
- A pure Si crystal having 5 × 10^28 atoms m^-3 is dopped with 1 ppm concentration of antimony. If the concentration of holes in the doped crystal is…2024
- With the help of circuit diagrams, briefly explain the forward biasing and the reverse biasing of a p-n junction diode.2026
- In an intrinsic semiconductor, carrier's concentration is 5 × 10^8 m^-3. On doping with impurity atoms, the hole concentration becomes 8 × 10^12…2025
- Assertion: A hole is an apparent free particle with effective positive electronic charge. Reason ( R ): A hole is not necessarily a vacancy left…2025
CBSE Class 12 Physics past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.