Which one of the following is not a donor impurity ?
Correct answer: C. aluminium
- A. antimony
- B. phosphorus
- C. aluminium
- D. arsenic
Explanation
Antimony, phosphorus and arsenic are pentavalent impurities, so they donate an extra electron to silicon or germanium and form n-type material. Aluminium is trivalent and accepts an electron, making it an acceptor impurity. The likely mistake is choosing arsenic by confusing its name with a different impurity category.
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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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