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Which outcome occurs when dopants introduce defects into a semiconductor crystal lattice?

A)Increased free carrier concentrations
B)Reduced thermal expansion coefficient
C)Increased resistance to dislocation
D)Reduced material refractive index

💡 Explanation

Introducing dopants causes increased free carrier concentrations due to the altered electronic band structure in the crystal lattice via band bending. Therefore, conductivity increases, rather than decreases or changes thermal and optical properties because doping directly impacts charge carrier density.

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