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Physics · 2025 · 3 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic Semiconductor3 marksApplyshort answer
CBSE 2025 · Region 2 · Set 2 · Q27
(a) What are majority and minority charge carriers in an extrinsic semiconductor? (b) A p-n junction is forward biased. Describe the movement of the…
(a)
What are majority and minority charge carriers in an extrinsic semiconductor?
(b)
A $\displaystyle p-n$ junction is forward biased. Describe the movement of the charge carriers which produce current in it.
(c)
The graph shows the variation of current with voltage for a $\displaystyle p-n$ junction diode.
Estimate the dynamic resistance of diode at $\displaystyle \mathrm{V}=-0.6$ volt.
Marking-scheme solution
(a)
In an extrinsic semiconductor, the charge carriers whose number density is large are known as majority charge carriers.
In an extrinsic semiconductor, the charge carriers whose number density is small are known as minority charge carriers.
(b)
Due to the applied forward voltage, electrons from n-side cross the depletion region and reach p-side. Similarly, holes from p-side cross the junction and reach the n-side. Due to the movement of these charge carriers current is produced.
(c)
At $\displaystyle V=-0.6$ volt, $\displaystyle I=0$, so dynamic resistance is infinite.
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