Near-Edge Ligand Stripping and Robust Radiative Exciton Recombination in CdSe/CdS Core/Crown Nanoplatelets.

ABSTRACT: We address the relation between surface chemistry and optoelectronic properties in semiconductor nanocrystals using core/crown CdSe/CdS nanoplatelets passivated by cadmium oleate (Cd(Ol)₂) as model systems. We show that addition of butylamine to a nanoplatelet (NPL) dispersion maximally displaces ∼40% of the original Cd(Ol)₂ capping. On the basis of density functional theory simulations, we argue that this behavior reflects the preferential displacement of Cd(Ol)₂ from (near)-edge surface sites. Opposite from CdSe core NPLs, core/crown NPL dispersions can retain 45% of their initial photoluminescence efficiency after ligand displacement, while radiative exciton recombination keeps dominating the luminescent decay. Using electron microscopy observations, we

SUBMITTER: Leemans J 

PROVIDER: S-EPMC7213063 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature