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← ScienceWhich conduction behavior occurs when impurities alter crystal lattices?
A)Increased free carrier concentration happens✓
B)Intrinsic conductivity invariably decreases gradually
C)The band gap immediately closes entirely
D)Thermal gradients have no effect at all
💡 Explanation
Increased free carrier concentration prevails via doping, because substitutional or interstitial impurities introduce extra electrons or holes within the band structure. This promotes extrinsic semiconductivity, therefore increasing the number of available charge carriers, rather than changes to intrinsic properties or gap closure.
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