Holes can exist in____________________?
Correct answer: C. Semi conductors
- A. Conductors
- B. Insulators
- C. Semi conductors
- D. All of the above
Explanation
A hole is an unoccupied position in the valence band and behaves as a positive charge carrier in a semiconductor. Students may choose d because they think any missing electron is a hole, but the term hole is used for charge transport in semiconductor valence bands, not for ordinary conductors or insulators.
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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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