Patent ID: 7997514

Claim:
A method for fabricating copper/indium/gallium/selenium (CIGS) nanoparticles, comprising the steps of: an individual milling process, a plurality of materials-being-milled being milled by using a first milling mediator and a first milling solvent in a milling machine to produce a plurality of individual milled materials, wherein the materials-being-milled comprises particles including copper, indium, gallium, and/or selenium, and compounds including copper selenide, indium selenide and gallium selenide, and a particle size of the individual milled materials is 500 to 600 nanometer (nm); a homogeneously mixing process, the individual milled materials being mixed by using a homogenizing solvent comprising a binder and a surfactant in a homogenizing machine to produce a mixed homogenate; a primary milling process, the mixed homogenate being milled by using a second milling mediator, a second milling solvent and a dispersant in a milling machine to produce primary milled materials with particle size 100 nm to 200 nm; an advanced milling process, the primary milled materials being milled by using a third milling mediator, a third milling solvent and the dispersant in a milling machine to produce advanced milled materials with particle size less than 50 nm, the advanced milled materials being CIGS nanoparticles.