Patent ID: 7452478
Filing Date: 2008-11-18
Classification: B82Y,C01P,C09C,C09K,H01L,Y02E

Abstract:
1. A method for purifying semiconductor nanoparticles, comprising the steps of: modifying semiconductor nanoparticles with oil-soluble materials for surface modification; converting the oil-soluble materials for surface modification into water-soluble materials for surface modification at the interface between an organic solvent and water; shifting the semiconductor nanoparticles from an organic phase to an aqueous phase by the conversion; removing impurities other than semiconductor nanoparticles; setting a wavelength of monochromatic light for size-selective etching to be shorter than a wavelength of absorption edge of the semiconductor nanoparticles having at least one desired particle size so as to dissolve and peel the surface of the semiconductor nanoparticles by size-selective photoetching, regulate desired particle sizes of the semiconductor nanoparticles and monodisperse the semiconductor nanoparticles; and then applying size-selective photoetching to the semiconductor nanoparticles so as to regulate particle sizes of the semiconductor nanoparticles and monodisperse the semiconductor nanoparticles, the surfaces of which have been modified with the water-soluble materials for surface modification, by irradiating the semiconductor nanoparticles with monochromatic light of the set wavelength.