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Which limit arises as electron density increases in semiconductors?

A)Thermionic emission current reduces sharply
B)Quantum Tunneling probability increases rapidly
C)Avalanche breakdown voltage dramatically decreases
D)Recombination rate nears radiative limits

💡 Explanation

As electron density increases, the width of the potential barrier decreases; therefore, quantum tunneling probability dramatically increases because the de Broglie wavelength allows electrons to pass through, rather than being contained by the barrier as classical physics predicts.

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