To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is_____________?
Correct answer: B. 3
- A. 2
- B. 3
- C. 4
- D. 5Education
Explanation
Silicon has four valence electrons, so doping it with a trivalent atom leaves one incomplete bond and produces a hole, making the crystal p-type. Option d, valency 5, would donate an extra electron and produce n-type silicon.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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