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Physics · 2022 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsIntrinsic Semiconductor2 marksAnalysevery short answer
CBSE 2022 · Region 1 · Set 3 · Q2
Distinguish between intrinsic and extrinsic semiconductors. Although in an extrinsic semiconductor n_e ≠ n_h, yet it is electrically neutral. Why?
Distinguish between intrinsic and extrinsic semiconductors. Although in an extrinsic semiconductor $\displaystyle \mathrm{n}_{\mathrm{e}} \neq \mathrm{n}_{\mathrm{h}}$, yet it is electrically neutral. Why ?
Marking-scheme solution
Intrinsic semiconductors are pure semiconductors while extrinsic semiconductors are doped with either trivalent or pentavalent impurities.Extrinsic semiconductor maintains an overall charge neutrality as the charge of additional charge carriers is just equal and opposite to that of the ionised cores in the lattice.
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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.