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US 7,390,568 B2Granted
Semiconductor nanocrystal heterostructures having specific charge carrier confinement
AssigneeMassachusetts Institute of Technology
InventorsSungjee Kim, Moungi G. Bawendi
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Abstract
A semiconductor nanocrystal heterostructure has a core of a first semiconductor material surrounded by an overcoating of a second semiconductor material. Upon excitation, one carrier can be substantially confined to the core and the other carrier can be substantially confined to the overcoating.
Claims38
A method of preparing a coated nanocrystal comprising:
- introducing a core nanocrystal including a first semiconductor material into an overcoating reaction mixture;
- and
- overcoating a second semiconductor material on the core nanocrystal, wherein the first semiconductor material and the second semiconductor material are selected so that, upon excitation of the nanocrystal to form an exciton, one charge carrier of the exciton is substantially confined to the core and the other charge carrier of the exciton is substantially confined to the overcoating.
A coated nanocrystal comprising:
- a core nanocrystal including a first semiconductor material;
- a chemically formed overcoating including a second semiconductor material on the core nanocrystal;
- and
- an organic layer on a surface of the coated nanocrystal,
- wherein the first semiconductor material and the second semiconductor material are selected so that, upon excitation of the nanocrystal to form an exciton, one charge carrier of the exciton is substantially confined to the core and the other charge carrier of the exciton is substantially confined to the overcoating.
2 more elements
A population of coated nanocrystals comprising:
- a plurality of coated nanocrystals, each coated nanocrystal including a core nanocrystal and a chemically formed overcoating on each core nanocrystal, wherein each core includes a first semiconductor material and each overcoating includes a second semiconductor material, the plurality of core nanocrystals forming a population of nanocrystals,
- wherein the first semiconductor material and the second semiconductor material are selected so that, upon excitation of the nanocrystal to form an exciton, one charge carrier of the exciton is substantially confined to the core and the other charge carrier of the exciton is substantially confined to the overcoating;
- and
- the plurality of nanocrystals is monodisperse.
1 more element
Dependencies are inferred from the claim text.