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← ScienceWhich consequence occurs in silicon when lattice dislocations concentrate impurities?
A)Decreased local band gap energy✓
B)Increased phonon scattering rates
C)Enhanced electron-hole recombination
D)Suppressed thermal conductivity nearby
💡 Explanation
A concentration of impurities in silicon near dislocations causes decreased band gap energy because local strain alters the electronic structure via quantum confinement. This reduces energy needed for electron excitation; therefore band gap decreases, rather than phonon blocking at macroscopic scales.
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