Semi-conductor germanium and silicon are_________________?
Correct answer: D. tetravalent
- A. pentavalent
- B. trivalent
- C. divalent
- D. tetravalent
Explanation
Silicon and germanium each have four valence electrons, so they are tetravalent elements and form covalent crystals. Their conductivity can be changed by doping, but doping does not change the valency of the basic semiconductor atoms. The likely mistake is choosing pentavalent because donor impurities are pentavalent, whereas silicon and germanium themselves are tetravalent.
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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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