CBSE 2022 · Region 5 · Set 2 · Q1 · 2 marks
Two crystals $\displaystyle \mathrm{C}_{1}$ and $\displaystyle \mathrm{C}_{2}$, made of pure silicon, are doped with arsenic and aluminium respectively.(i)Identify the extrinsic semiconductors so formed.(ii)Why is doping of intrinsic semiconductors necessary ?
Two crystals $\displaystyle \mathrm{C}_{1}$ and $\displaystyle \mathrm{C}_{2}$, made of pure silicon, are doped with arsenic and aluminium respectively.
(i)
Identify the extrinsic semiconductors so formed.
(ii)
Why is doping of intrinsic semiconductors necessary ?
Marking-scheme solution
i) $\displaystyle \mathrm{C}_{1}$ n-type $\displaystyle \mathrm{C}_{2}$ p-type
ii) To have higher and regulated conductivity
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic SemiconductorUnderstandvery_short_answereasy
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