Question
Download Solution PDFConductivity of an extrinsic semiconductor is considerably influenced by :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe conductivity of an extrinsic semiconductor is considerably influenced by 1) Majority charge carriers originating from doping.
Explanation:
Extrinsic Semiconductors:
- These are semiconductors that have been doped with impurities to increase their conductivity.
- Doping introduces either an excess of electrons (n-type) or an excess of holes (p-type).
- Majority Carriers:
- In n-type semiconductors, electrons are the majority carriers.
- In p-type semiconductors, holes are the majority carriers.
- The concentration of these majority carriers is significantly higher than the concentration of minority carriers.
- Conductivity:
- Conductivity is directly proportional to the concentration of charge carriers.
- Since doping greatly increases the concentration of majority carriers, they have a much greater influence on conductivity than minority carriers.
- Minority Carriers:
- Minority carriers are generated by thermal agitation.
- Although minority carriers contribute to the current, their number is very small compared to majority carriers.
- Therefore, they have very little effect on the conductivity of an extrinsic semiconductor.
Therefore, the correct answer is:
-
- Majority charge carriers originated from doping
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