Question:
In a semiconductor, conductivity can be increased by
In a semiconductor, conductivity can be increased by
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Unlike metals, semiconductors get *more* conductive as they get hotter or when "dirt" (impurities) is added.
Updated On: May 5, 2026
- Cooling it to a very low temperature
- Applying a strong magnetic field
- Doping with impurities
- Removing free electrons
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The Correct Option is C
Solution and Explanation
Step 1: Concept The electrical conductivity of a semiconductor is determined by the concentration of its charge carriers (electrons and holes).
Step 2: Meaning Pure (intrinsic) semiconductors have low conductivity at room temperature because they have few free carriers.
Step 3: Analysis Doping is the intentional addition of specific impurity atoms (like Phosphorus or Boron) to the semiconductor crystal. This process significantly increases the number of free electrons (n-type) or holes (p-type), thereby boosting conductivity.
Step 4: Conclusion Therefore, doping is the primary method used to control and increase semiconductor conductivity.
Final Answer: (C)
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