To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is_____________?
Correct answer: D. 5
- A. 2
- B. 3
- C. 4
- D. 5
Explanation
Germanium has four valence electrons, and doping it with a pentavalent impurity supplies one extra free electron, producing an n-type semiconductor. A trivalent impurity, option b, would create holes and give p-type germanium instead.
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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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