Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Exchange of the surface passivation in semiconductor nanocrystals often profoundly influences the nanocrystal photoluminescence efficiencies, but generally does not induce significant energetic shifts in their absorption and emission features. We now report that surface exchange between amine passivated (L type) and metal carboxylate passivated (M = Cd, Zn; Z type) surfaces of cadmium selenide and cadmium sulfide quantum platelets and quantum belts (nanoribbons) induces exciton energy shifts as large as 150 meV in their absorption and emission spectra. Moreover, these energy shifts and the nature of the surface passivation are entirely reversible. The reversible electronic perturbations are attributed to changes in the strain states and confinement dimensions of the 2D nanocrystals upon surface exchange. Experimental determination of surface passivations, lattice strain, and confinement dimension will be presented. We propose the surface passivation effects on lattice strain and confinement to be magnified in quantum platelets and quantum belts relative to other nanocrystals because of their very large surface fractions and thin confinement dimension.
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