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Which outcome occurs when a crystal lattice defect increases?

A)Photovoltaic efficiency degrades near grain
B)Thermal conductivity increases sharply again
C)Superconductivity onset temperature increases
D)Carrier mobility shows weaker dependence

💡 Explanation

Increased crystal lattice defects enhance electron-phonon scattering, reducing carrier lifetime because phonons disrupt electron flow, therefore photovoltaic efficiency degrades, rather than increasing conductivity or boosting superconducting transition due to defect states.

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