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Which 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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