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Which material alteration enables transistor switching via band gaps?

A)Controlled impurity doping profiles
B)Increased crystalline grain boundaries
C)Induced mechanical tension
D)Elevated operating temperature

💡 Explanation

Controlled doping alters the semiconductor's band structure using Fermi level adjustment in the depletion regions, which controls potential. Because free carriers change, therefore allows conductive and insulated operational states; rather than influencing parameters directly.

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