A n-type semiconductor is formed in an extrinsic semiconductor when
Correct answer: B. Only a pentavalent impurity is added to it.
- A. Only a trivalent impurity is added to it.
- B. Only a pentavalent impurity is added to it.
- C. Both trivalent and pentavalent impurities are added to it.
- D. Both trivalent and pentavalent impurities are removed from it.
Explanation
An n-type semiconductor is formed when a pentavalent impurity, such as phosphorus, is added to the semiconductor material. This impurity donates extra electrons, increasing the number of free electrons, which are the majority carriers in n-type semiconductors. In contrast, trivalent impurities create p-type semiconductors by introducing holes, which are positive charge carriers. Adding both types of impurities or removing them would not result in a clear n-type semiconductor.
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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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