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← ScienceWhich outcome occurs when donor impurities increase semiconductor conductivity?
A)Fermi level shifts nearer conduction band✓
B)Electron mobility sharply decreases overall
C)Band gap energy increases marginally
D)Hole concentration becomes nearly intrinsic
💡 Explanation
The Fermi level shifts because increasing donor impurities increases the number of free electrons close to the conduction band due to increased n-type doping shifting fermi energy. This, therefore, increases conductivity, rather than decreasing mobility or altering band gap significantly.
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