Patent ID: 7267810

Claim:
A method of making nanocrystals comprising: preparing a chalcogen source consisting essentially of a first complex of a chalcogen and a ligand solvent, said first complex being dissolved in said ligand solvent; preparing at least one cation source consisting essentially of a second complex of a metal-containing non-organometallic precursor compound and said ligand solvent, said second complex being dissolved in said ligand solvent; subsequently adding said at least one chalcogen source to said at least one cation source at a first temperature in the range of 200-300° C. to form a nanocrystal precursor solution consisting essentially of said chalcogen source and said cation source in the absence of a further ligand solvent; and growing said nanocrystals in said nanocrystal precursor solution at a second temperature lower than said first temperature.