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← ScienceWhich mechanism enables electron tunneling when semiconductor gaps shrink?
A)Quantum mechanical barrier penetration✓
B)Increased electron-hole recombination
C)Phonon-assisted direct bandgap transition
D)Auger electron generation cascade
💡 Explanation
A reduced gap enables *quantum mechanical barrier penetration* because electrons can tunnel through shorter distances; therefore, tunneling becomes probable rather than being stopped, due to decreased potential barrier width influencing tunneling probability.
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