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Physics · 2022 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple Circuitsp-n Junction2 marksUnderstandvery short answer
CBSE 2022 · Region 1 · Set 2 · Q1
Explain the formation of depletion layer and barrier potential in a p-n junction diode.
Explain the formation of depletion layer and barrier potential in a p-n junction diode.
Marking-scheme solution
Formation of depletion region: During formation of p-n junction a hole diffuses from p to n region and electron diffuses from n to p region due to concentration gradient. It leaves behind immobile ions at the junction on both sides. This space charge region at the junction is together called depletion region.
Potential Barrier : The immobile ions on p side are negative and on n side are positive. They create a potential difference preventing the further flow of majority charge carriers. This potential is called as barrier potential.
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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.