CBSE 2022 · Region 3 · Set 3 · Q3 · 2 marks
Name the extrinsic semiconductors formed when a pure germanium is doped with (i) a trivalent and (ii) pentavalent impurity. Draw the energy band diagrams of extrinsic semiconductors so formed.
Marking-scheme solution
(a)
Naming of semiconductor &
(b)
a)
b) 
(a) $\displaystyle T>0 \mathrm{~K}$ one thermally generated electron-hole pair + $\displaystyle 9$ electrons from donor atoms
(a) $\displaystyle T>0 \mathrm{~K}$ one thermally generated electron-hole pair + $\displaystyle 9$ electrons from donor atoms(b)
$\displaystyle \mathrm{T}>0 \mathrm{~K}$
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic SemiconductorRemembervery_short_answermedium
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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.