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Physics · 2023 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic Semiconductor2 marksUnderstandvery short answer
CBSE 2023 · Region 2 · Set 1 · Q25
Answer the following giving reasons: (i) A p-n junction diode is damaged by a strong current. (ii) Impurities are added in intrinsic semiconductors.
Answer the following giving reasons :
(i)
A p-n junction diode is damaged by a strong current.
(ii)
Impurities are added in intrinsic semiconductors.
Marking-scheme solution
Reasons for
i) Damage of a p-n junction diode by a strong current - $\displaystyle 1$
ii) Adding impurities in intrinsic semiconductor - $\displaystyle 1$
i) Due to strong current, a junction diode gets heated, consequently large number of covalent bonds are broken and the junction is damaged.
ii) Deliberate addition of impurity atoms in intrinsic semiconductor increases its conductivity and is suitable for making electronic devices.
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