As-synthesized colloidal semiconductor nanocrystals are capped by surface-coordinating ligands that act to passivate surface sites and suspend the colloidal particles in solution. Upon thermochemical doping with chemical reductants, we find that a portion of the native anionic ligands are liberated from the nanocrystal surfaces. UV-Vis absorption, <sup>1</sup>H NMR, and FTIR spectroscopies are leveraged to provide a complete picture of how added electrons reduce surface-based Cd and Se ions before filling the conduction band. These data reveal a new mechanism for charge balance in thermochemical doping reactions wherein anionic oleate ligands are liberated from the surface as free carriers are trapped in a subpopulation of cadmium-based localized surface states.<br/>

X-type ligand displacement at CdSe quantum dot surfaces promoted by addition of charge carriers

2019 Spring National Meeting

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