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Physics · 2022 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic Semiconductor2 marksRemembervery short answer
CBSE 2022 · Region 3 · Set 3 · Q3
Name the extrinsic semiconductors formed when a pure germanium is doped with (i) a trivalent and (ii) pentavalent impurity. Draw the energy band…
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)
(i) p-type semiconductor
(ii) n-type semiconductor
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)
$\displaystyle \mathrm{T}>0 \mathrm{~K}$
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