Copper zinc tin chalcogenide nanoparticles
AssigneeE.I. du Pont de Nemours and Company
InventorsDaniela Rodica Radu, Jonathan V. Caspar, Lynda Kaye Johnson, H. David Rosenfeld, Irina Malajovich, Meijun Lu
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Abstract
This invention relates to nanoparticles of kesterite (copper zinc tin sulfide) and copper zinc tin selenide nanoparticles, inks and devices thereof, and processes to prepare same. The nano-particles are useful to for the absorber layer as a p-type semiconductor in a thin film solar cell application.
Claims20
A quaternary nanoparticle comprising copper, zinc, tin, a chalcogen, and a capping agent, wherein the chalcogen is selected from the group consisting of sulfur, selenium and mixtures thereof.
A process for preparing a copper-zinc-tin-chalcogenide quaternary nanoparticle, comprising (a) forming in a solvent a reaction mixture of (i) metal salts and/or complexes of copper, zinc and tin, (ii) one or more chalcogen precursor(s), and (iii) a first capping agent, and (b) heating the reaction mixture to form a nanoparticle.
Dependencies are inferred from the claim text.