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Which consequence results when a quantum dot's wavefunction penetration ('tunneling') increases due to size reduction?

A)Reduced electron-hole recombination efficiency
B)Increased quantum confinement energy levels
C)Enhanced radiative decay rates for excitons
D)Decreased sensitivity to external electric fields

💡 Explanation

When the QD size reduces, wavefunction penetration ('tunneling') increases because decreasing confinement length scales emphasizes quantum mechanical effects, reducing probability densities inside the dot. Therefore, recombination efficiency decreases, because fewer carriers confined and captured, compared to enhanced decay rates or altered external field sensitivity, due to modified but sustained spatial confinement.

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