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← ScienceWhich outcome occurs when dopants segregate at grain boundaries of a polycrystalline silicon lattice?
A)Decreased overall carrier mobility✓
B)Enhanced electron-phonon coupling
C)Increased grain boundary transparency
D)Suppressed thermal boundary resistance
💡 Explanation
A decrease in carrier mobility occurs because dopant segregation modifies the electronic potential via the process of electrostatic screening near grain boundaries, presenting scattering sites. Therefore carrier mobility reduces, rather than increased transparency, as other changes also do not occur.
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