Question:
If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?
If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?
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If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?
Updated On: Apr 15, 2026
- p-type
- n-type
- Both (a) and (b)
- None of the two
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Doping a semiconductor with impurities of different valency changes its conductivity type.
Step 2: Analysis
Germanium (Group 14) has 4 valence electrons. A pentavalent impurity (Group 15) has 5 valence electrons.
Step 3: Conclusion
When doped, four electrons form bonds, while the fifth electron remains free. This excess of electrons leads to the formation of an n-type semiconductor.
Final Answer: (B)
Doping a semiconductor with impurities of different valency changes its conductivity type.
Step 2: Analysis
Germanium (Group 14) has 4 valence electrons. A pentavalent impurity (Group 15) has 5 valence electrons.
Step 3: Conclusion
When doped, four electrons form bonds, while the fifth electron remains free. This excess of electrons leads to the formation of an n-type semiconductor.
Final Answer: (B)
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