International Business Machines Corporation

King Abdulaziz City for Science and Technology

Xin Ai

Robert Dennis Miller

John Campbell Scott

John David Bass

Qing Song

Ho-Cheol Kim

Abdulaziz Bagabas

Mohammed Abdullah Bahattab

A method of forming CuFeSchalcopyrite nanoparticles. The method includes, in the presence of one or more ligands, reacting an iron-containing compound, a copper-containing compound and a sulfur-containing compound to form CuFeSchalcopyrite nanoparticles; and wherein at least one of the ligands forms a coordination complex with copper, and at least one of the ligands forms a coordination complex with iron. Also a method of forming metal-doped CuFeSchalcopyrite nanoparticles such as Zn-doped CuFeSchalcopyrite nanoparticles. Also, a CuFeSchalcopyrite nanoparticle layer on a substrate. Also, a composition of matter including Zn-doped CuFeSchalcopyrite nanoparticles. Also, a Zn-doped CuFeSchalcopyrite nanoparticle layer on a substrate.

Methods for making doped and undoped copper chalcopyrite nanoparticles and thin films thereof

Nanoparticles in a colloid are purified, with the colloid including a fluid, unwanted matter, and the nanoparticles to be purified. An electric field is applied that is substantially spatially uniform over a distance that is at least equal to a characteristic dimension of the nanoparticles, so that at least some of the nanoparticles move towards at least one collection surface as a result of the force arising between their electrical charge and the electric field, whereupon nanoparticles are collected on said at least one collection surface. The collection surface(s) may be one or more electrodes to which a voltage potential is applied. The collected nanoparticles are then removed from the collection surface, e.g., by dispersing them into another fluid.

Method of purifying nanoparticles in a colloid

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Xin Ai