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Physics · 2024 · 3 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic Semiconductor3 marksUnderstandshort answer
CBSE 2024 · Region 5 · Set 1 · Q28
Explain the following, giving reasons: (a) A doped semiconductor is electrically neutral. (b) In a p - n junction under equilibrium, there is no net…
Explain the following, giving reasons :
(a)
A doped semiconductor is electrically neutral.
(b)
In a $\displaystyle \mathrm{p}-\mathrm{n}$ junction under equilibrium, there is no net current.
(c)
In a diode, the reverse current is practically not dependent on the applied voltage.
Marking-scheme solution
(a)
The charge of the additional charge carriers is just equal and opposite to that of the ionised cores in the lattice.
(b)
Under equilibrium, the diffusion current is equal to the drift current.
(c)
Reverse current is limited due to the concentration of minority charge carriers on either side of the junction.
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CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.