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Which outcome occurs when a silicon crystal contains excess phosphorus?

A)Increased electron conductivity
B)Decreased hole concentration
C)Limited current capacity
D)Induced piezoelectric effect

💡 Explanation

Excess phosphorus donates electrons, increasing conductivity because the doping mechanism overwhelms the silicon’s intrinsic carrier concentration; therefore, electron conductivity rises, rather than hole concentration decreasing or a piezoelectric effect being induced.

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