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← ScienceWhich change occurs when radiative recombination dominates in direct band semiconductors?
A)Reduced electron-hole pair lifetime✓
B)Increased defect-mediated recombination
C)Enhanced impurity scattering rate
D)Increased phonon emission probability
💡 Explanation
Radiative recombination emits photons, therefore it occurs via direct band transitions. Minority carrier lifetime decreases because electrons directly recombine rather than via traps or defects, causing non-radiative processes.
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