Large-grain crystallized metal chalcogenide film, colloidal solution of amorphous particles, and preparation methods
AssigneeImra Europe SAS
InventorsStephane Bourdais, Christophe Chone, Yan Cuccaro
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Abstract
The present invention relates to a method for preparing an aqueous or hydro-alcoholic colloidal solution of metal chalcogenide amorphous nanoparticles notably of the Cu2ZnSnS4 (CZTS) type and to the obtained colloidal solution. The present invention also relates to a method for manufacturing a film of large-grain crystallized semi-conducting metal chalcogenide film notably of CZTS obtained from an aqueous or hydro-alcoholic colloidal solution according to the invention, said film being useful as an absorption layer deposited on a substrate applied in a solid photovoltaic device.
Claims8
A hydro-alcoholic colloidal solution consisting of:
- primary amorphous nanoparticles of metal chalcogenides of formula M-C dispersed in a hydro-alcoholic solvent, wherein:
- M represents one or several first metals, either identical or different, selected from Cu, Zn, and Sn, and
- C represents one or several chalcogenide elements, either identical or different, selected from S and Se,
- wherein said primary amorphous nanoparticles have a size of less than 30 nm,
- wherein the alcohol is a non-toxic alcohol having a boiling temperature below the boiling temperature of water, and
- wherein the hydro-alcoholic solution does not contain organic ligands.
Dependencies are inferred from the claim text.