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Which mechanism causes increased conductivity in a doped semiconductor crystal?

A)Increased mobile carrier concentration
B)Reduced phonon scattering amplitude
C)Enhanced electron-hole recombination rate
D)Increased crystal lattice symmetry

💡 Explanation

Increased doping introduces more free electrons or holes, therefore increasing the mobile carrier concentration and consequently, the conductivity. This enhanced concentration increases current flow, because it provides more charge carriers, rather than altering phonon effects, recombination rates or crystal symmetry.

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