Patent ID: 8057850

Claim:
A method of forming a thin film layer of copper-indium-selenide, comprising: dispersing a liquid-based Inâ€”Se precursor comprising In and Se in a liquid matrix on a substrate; heating the liquid-based precursor comprising the In and Se in the liquid matrix to vaporize and drive away the liquid matrix, to decompose the precursor comprising the In and Se, to vaporize ligands from the decomposed Inâ€”Se precursor, to vaporize volatile products from the Inâ€”Se precursor including Se and/or H 2 Se, and to form and anneal crystalline Inâ€”Se on the substrate; cooling the annealed crystalline Inâ€”Se film on the substrate; dispersing a liquid-based Cuâ€”Se precursor comprising Cu and Se in a liquid matrix on the crystalline Inâ€”Se film; and heating the liquid-based Cuâ€”Se precursor comprising the Cu and Se in the liquid matrix to vaporize and drive away the liquid matrix, to decompose the Cuâ€”Se precursor comprising the Cu and Se, to vaporize ligands from the decomposed Cuâ€”Se precursor, to vaporize volatile products from the Cuâ€”Se precursor including Se and/or H 2 Se, and to form and anneal crystalline Cuâ€”Se together with the crystalline Inâ€”Se film to form a crystalline Cuâ€”Inâ€”Se film.