CBSE 2022 · Region 1 · Set 1 · Q1 · 2 marks
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.
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CBSE Class 12 Physics past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.