Colloidal semiconductor nanostructures
AssigneeYissum Research Development Company of the Hebrew University of Jerusalem
InventorsUri BANIN, Jiabin CUI, Yossi PANFIL, Nir WAISKOPF, Meirav ODED
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Abstract
The technology subject of the present application concerns a novel class of fused nanocrystal molecules having unique electronic properties. The application further contemplates methods for their preparation and methods of their use.
Claims31
A fused nanocrystal molecule comprising two or more semiconductor core/shell structures, the fused nanocrystal molecule comprising two or more core structures and a continuous outermost shell extending the circumference of the two or more core structures, the outermost shell comprising a material identical to a shell material of any of said two or more semiconductor core/shell structures or an alloy material of the shell materials of the two or more semiconductor core/shell structures, wherein each two core/shell structures of the two or more fused semiconductor core/shell structures having a fusion region of a thickness between 0.1 and 5 nm.
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A process for preparing a fused nanocrystal molecule comprising two or more semiconductor core/shell structures, the fused nanocrystal molecule comprising two or more core structures and a continuous outermost shell extending the circumference of the two or more core structures, the outermost shell comprising a material identical to a shell material of any of said two or more semiconductor core/shell structures or an alloy material of the shell materials of the two or more semiconductor core/shell, the process comprising
- immobilizing a first core/shell population on a surface region of a substrate,
- chemically grafting ligand molecules onto a surface region of the immobilized core/shells of the first population,
- contacting the immobilized core/shells of the first population with core/shells of a second population to thereby associate the core/shells of the second population to the immobilized core/shell structures and obtain a dimer assembly on the surface region of the substrate,
- optionally repeating the contacting step one or more times with core/shells of a third or further population to obtain nanocrystal multimer assembly,
- releasing the dimer assembly or multimer assembly from the substrate, and
- fusing the core/shell structures in the dimer or multimer assembly.
A process for directing attachment of a first nanocrystal to a preselected region of a second nanocrystal, the process comprising
- blocking a reactive region on the surface of the second nanocrystal;
- directing fusion to the preselected region of the second nanocrystal;
- allowing fusion between the first and second nanocrystal;
- and
- optionally de-blocking the reactive region;
- to thereby obtain a fused nanocrystal molecule.
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Dependencies are inferred from the claim text.