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← ScienceWhich mechanism causes decreased avalanche breakdown voltage in LEDs?
A)Defect-induced Shockley-Read-Hall recombination
B)Increased phonon scattering at interfaces
C)Quantum tunneling through the barrier
D)Band gap narrowing near defects✓
💡 Explanation
Band gap narrowing near defects lowers the energy needed for impact ionization, increasing reverse current at lower voltages, because the electric field enhances the effect of defects and therefore, the breakdown happens at a lower-than-expected voltage, rather than at the ideal intrinsic breakdown voltage.
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