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← ScienceWhich mechanism limits electron mobility in impure crystal semiconductors?
A)Phonon scattering reduces carrier velocity
B)Umklapp scattering in Brillouin zones
C)Impurity scattering changes electron trajectories✓
D)Intervalley scattering lowers effective mobility
💡 Explanation
Impurity scattering limits electrons because lattice defects impede motion changing carrier trajectories; therefore, mobility decreases rather than phonon scattering or Umklapp processes, which are intrinsic to perfect crystal lattice vibration.
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