NOVELTY - A active layer forming solution comprises a solvent, an additive mixed with solvent to provide a solvent-additive blend, and a solute comprising at least one of a transition metal, an alkali metal, an alkaline earth metal, aluminum, gallium, indium, germanium, tin or antimony dissolved in elemental form in solvent-additive blend. The additive is chosen from amine-containing compounds.    USE - Solution is used for manufacturing Kesterite film on substructure of electronic or electro-optic device (all claimed), and photovoltaic device e.g. solar cell.    ADVANTAGE - The electronic or electro-optic device is economically manufactured with high productivity using the solution.    DETAILED DESCRIPTION - A active layer forming solution comprises a solvent, an additive mixed with solvent to provide a solvent-additive blend, and a solute comprising at least one of a transition metal, an alkali metal, an alkaline earth metal, aluminum, gallium, indium, germanium, tin or antimony dissolved in elemental form in solvent-additive blend. The additive is chosen from amine-containing compounds of formula: NR1R2NHCOOH, NH2NHCONHNH2, NH2COOHNH3, NH2NHC(=NH)NH2-H2CO3, NH2NHCSNHNH2, NH2NHCSSH and their mixture.    R1,R2=H, aryl, methyl, ethyl or linear, branched or cyclic 3-6C alkyl.    INDEPENDENT CLAIMS are included for the following:    (1) manufacture of solution, which involves providing a solvent, mixing additive with solvent to provide a solvent-additive blend and dissolving at least one of transition metal, alkali metal, alkaline earth metal, aluminum, gallium, indium, germanium, tin or antimony in elemental form in solvent-additive blend;    (2) manufacture of Kesterite film on substructure, which involves obtaining solution comprising copper, zinc, tin and one of sulfur and selenium dissolved in a solvent, depositing a layer of solution on a substructure and heating layer of solution such that layer forms Kesterite film; and    (3) electronic or electro-optic device comprising a Kesterite film on a substructure.