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US 2013/0095602 A1Published application
Atypical kesterite compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsLYNDA KAYE JOHNSON, H. DAVID ROSENFELD, DANIELA RODICA RADU
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Abstract
This invention relates to processes for making kesterite compositions with atypical Cu:Zn:Sn:S ratios and/or kesterite compositions with unusually small coherent domain sizes. This invention also relates to these kesterite compositions and their use in preparing CZTS films.
Claims13
1-4. (canceled)
A composition comprising a compound having a kesterite structure,
- wherein the coherent domain size of the kesterite is 2-30 nm.
A process comprising:
- a) preparing an ink comprising:
- i) a copper source selected from the group consisting of copper complexes of nitrogen-, oxygen-, sulfur-, and selenium-based organic ligands, and mixtures thereof;
- ii) a tin source selected from the group consisting of tin complexes of nitrogen-, oxygen-, carbon-, sulfur-, and selenium-based organic ligands, tin hydrides, tin sulfides, tin selenides, and mixtures thereof;
- iii) a zinc source selected from the group consisting of zinc complexes of nitrogen-, oxygen-, sulfur-, and selenium-based organic ligands, and mixtures thereof;
- iv) an elemental chalcogen selected from the group consisting of:
- elemental S, elemental selenium, and mixtures thereof;
- v) a solvent;
- iv) optionally, a chalcogen compound selected from the group consisting of:
- R1S—Z, R1Se—Z and mixtures thereof, with each Z independently selected from the group consisting of:
- H and SiR53;
- wherein each R1 and R5 is independently selected from the group consisting of:
- hydrocarbyl and O-, N-, S-, halogen- and tri(hydrocarbyl)silyl-substituted hydrocarbyl;
- b) heating the ink to a temperature of 150-300° C.;
- b) disposing the ink onto a substrate;
- and
- c) heating the substrate and ink disposed thereon to a temperature of 80-350° C. to form a coated substrate comprising CZTS—Se kesterite.
13 more elements
Dependencies are inferred from the claim text.