Transition metal doping in colloidal semiconductor nanocrystals (NCs) has led to the expansion of their functionality from the interaction of the exciton with the dopants through either energy or charge transfer. Mn dopants in CdS/ZnS NCs act as a long lived intermediate state capable of facilitating back energy transfer to excited state electrons generating high energy hot electrons. The hot electrons generated can perform photocatalysis as well as being ejected from the NCs under vacuum but suffer from low generation efficiencies. To circumvent this issue copper dopants were introduced into the structure of Mn-doped CdS/ZnS NCs The copper dopants in II-V host act as a charge accepting hole trap that extends the lifetime of the conduction band electrons, increasing the probability for back energy transfer from Mn. The hot electron generation efficiency was probed through the comparison of photoemission intensity between Mn-doped and Cu/Mn-codoped NCs. These results will determine the optimal structure for generating hot electrons capable of becoming solvated electrons in liquid ammonia.<br/>

Designing mn-doped semiconductor nanocrystals generating hot electrons under visible light excitation

2019 Spring National Meeting

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