NOVELTY - Making a photovoltaic absorber layer on a substrate comprises (a) providing a substrate coated with an electrical contact layer; (b) depositing a layer of an ink on the contact layer of the substrate, where the ink contains one or more polymeric precursor compounds; and (c) heating the substrate, where the polymeric precursor compound is a copper-silver-selenium compound (I).    USE - The photovoltaic absorber material is useful for semiconductors and optoelectronic materials and devices including thin-film solar cells e.g. copper indium gallium diselenide thin-film solar cells, copper indium selenide thin-film solar cells. The solar cells are useful in modular panels and power systems, which is useful for lighting, electric vehicles, electric buses, electric airplanes, pumping water, desalinization of water, refrigeration and milling purpose.    ADVANTAGE - The process reproducibly produces photovoltaic absorber layer on a substrate in high yield and with high thickness per pass. The photovoltaic absorber materials: exhibit high uniformity and quality; are free of cracks; and provides solar cells with high efficiency.    DETAILED DESCRIPTION - Making a photovoltaic absorber layer on a substrate comprises (a) providing a substrate coated with an electrical contact layer; (b) depositing a layer of an ink on the contact layer of the substrate, where the ink contains one or more polymeric precursor compounds; and (c) heating the substrate, where the polymeric precursor compound is a copper-silver-selenium compound of formula ((Cu1-xAgx)uM(MB11-y-tMB2yMB3t)((S1-zSez)R)w) (I).    MB1 = In;    MB2 = Ga;    MB3 = Al;    x, y, t, z = 0-1, where the sum of y and t is 0-1;    u = 0.6-1;    w = 3+u; and    R = alkyl.    INDEPENDENT CLAIMS are included for:    (1) the photovoltaic absorber material obtained by the above process;    (2) the polymeric precursor compound of formula ((Cu1-xAgx)u(In1-y-tGayAlt)((S1-zSez)R)w) (I); and    (3) the ink for making a photovoltaic absorber material comprising one or more precursor compounds (I) and an additive dissolved in one or more solvents.