MCQ
Q.
In which type of extrinsic semiconductor are electrons the major charge carriers?
Correct Answer: A
CONCEPT:
- Semiconductor: The material which is not a good conductor or a good insulator is called a semiconductor.
- For example: Silicon, Germanium, etc
- Intrinsic semiconductor: The pure form of semiconductor is called an intrinsic semiconductor.
- Extrinsic semiconductor: The impurity atoms added are called dopants and semiconductors doped with the impurity atoms are called extrinsic or doped semiconductors.
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P-type semiconductor: The semiconductor having holes as majority charge carriers and electrons as a minority charge carrier is called as P-type semiconductor.
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N-type semiconductor: The semiconductor having electrons as majority charge carriers and holes as a minority charge carrier is called as N-type semiconductor.
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EXPLANATION:
- From the above discussion, we can say that electrons are the major charge carriers in n-type semiconductors.
- Elements of Group 5 have five valence electrons, i.e. 1 extra from the Group 4 elements.
- 4 out of 5 electrons get bonded with the neighboring Silicon atoms and 1 electron per atom remains extra with the Group 5 elements.
