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Which outcome occurs when a doped semiconductor's crystal lattice reaches cryogenic temperatures?

A)Increased electron-phonon scattering reduces mobility
B)Impurity band merges with conduction band
C)Electron-hole recombination rate plateaus sharply
D)Ferromagnetic domains spontaneously align fully

💡 Explanation

As a semiconductor crystal lattice approaches absolute zero, the thermal energy decreases; dopant ionization energy drops sharply leading to the merging of the impurity band with the conduction band, therefore increasing conductivity rather than reducing mobility because lattice displacement decreases at those levels.

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