Publication date: 8th July 2026
We investigated the unusually weak electric-field effect on the trajectories of hot electrons photogenerated in Mn-doped quantum dots via Mn-mediated Auger upconversion process. This effect is equivalent to increasing the “spur radius” of the resulting solvated electrons after thermalization and solvation in liquid mediua. The short-lived (<1 ps) quasi-free electrons in the conduction band of liquid water, formed immediately after the ejection of energetic hot electrons from the QDs, undergo electric field-assisted drift, resulting in a larger travel distance before localization as solvated electrons. Because quasi-free electrons have very high mobility and experience much weaker high-frequency dielectric screening (e.g., a dielectric constant of ~2 at ~1013 Hz), even a modest external field with an amplitude of 1 kV/mm can alter the quasi-free-electron trajectory sufficiently to suppress geminate recombination. This process is highly beneficial for electron transfer mediated by solvated electrons by shutting off the geminate recombination channel.
THis work was supported by NSF.
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