TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The composition further comprises an M3 chalcogenide or its salt in the liquid medium. Preferred Components: M1 is tin. M2 is zinc. The copper chalcogenide is copper(I) sulfide, copper monosulfide, copper(II) selenide, copper selenide, Copper tin sulfide, copper tin selenide, copper tin sulfide/selenide (Cu2Sn(S,Se)3), copper zinc tin sulfide, copper zinc tin selenide and/or copper zinc tin sulfide/selenide (Cu2ZnSn(S,Se)4). The M1 chalcogenide is tin(II) selenide, tin(II) sulfide, tin IV selenide, tin(IV) sulfide, copper tin sulfide, copper tin selenide, Cu2Sn(S,Se)3, copper zinc tin sulfide, copper zinc tin selenide and/or Cu2ZnSn(S,Se)4. The M2 chalcogenide is Zinc sulfide, Zinc selenide, copper zinc tin sulfide, copper zinc tin selenide and/or Cu2ZnSn(S,Se)4. M3 comprises an element comprising sodium, potassium, lithium, antimony, bismuth, calcium, strontium, barium, or boron. The M3 chalcogenide or its salt is antimony(III) sulfide, antimony(III) selenide, antimony sulfide/selenide (Sb2(S,Se)3), antimony sulfide, sodium sulfide, sodium selenide, sodium sulfide/selenide (Na2(S,Se)), potassium sulfide, potassium selenide, potassium sulfide/selenide (K2(S,Se)), lithium sulfide, lithium selenide, lithium sulfide/selenide (Li2(S,Se)), bismuth(III) sulfide, bismuth selenide, bismuth sulfide/selenide (Bi2(S,Se)3), antimony (III) chloride, antimony (III) bromide, antimony (III) iodide, antimony(III) acetate, antimony(III) tartrate, antimony pentachloride, antimony pentabromide, antimony trifluoride, antimony pentafluoride, sodium chloride, sodium bromide, sodium iodide, sodium fluoride, sodium hydroxide, sodium acetate, sodium sulfate, sodium nitrite, sodium thiosulfate, sodium nitrate, sodium sulfite, sodium selenite, potassium fluoride, potassium chloride, potassium bromide, potassium iodide, potassium hydroxide, potassium acetate, potassium sulfate, potassium thiosulfate, potassium nitrite, potassium nitrate, potassium sulfite, potassium selenite, lithium fluoride, lithium chloride, lithium bromide, lithium iodide, lithium hydroxide, lithium acetate, lithium sulfate, lithium nitrate, lithium nitrite, lithium sulfite, lithium thiosulfate, lithium selenite, bismuth trifluoride, bismuth chloride, bismuth tribromide, bismuth(III) iodide, bismuth(III) nitrate pentahydrate, bismuth(III) acetate or bismuth(III) citrate. The chalcogenide film has a structure of formula (Cu2-xM11+yM21+p(S1-zSez)4+q). The substrate comprises one or more of a metal foil substrate, aluminum foil coated with a layer of molybdenum, a glass substrate with conductive coating, a ceramic substrate with conductive coating and a polymer substrate with a conductive coating.x, z = 0-1, preferably x is 0-0.5, and z is 0-1; andy, p, q = -1 to 1, preferably -0.5 to 0.5.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic additive is urea. The liquid medium comprises a solvent comprising water, ammonium hydroxide, ammonium hydroxide-water mixtures, ammonium sulfide-ammonium hydroxide-water mixtures, alcohols, ethers, glycols, aldehydes, ketones, alkanes, amines, dimethyl sulfoxide, cyclic compounds and/or halogenated organic compounds. EXAMPLE - 1.015 g of Copper(II) chloride, 0.600 g of zinc chloride and 0.519 ml of tin (IV) chloride were dissolved into 15 ml of de-ionized water. The reaction solution was then slowly added into a mixture of 5 ml of ammonium sulfide and 5 ml of deionized water under vigorous stirring. After the mixing was finished, another 5 ml of ammonium sulfide and 5 ml of deionized water were added into the mixture under stirring. The mixture was then stirred for 10 minutes and subjected to ultrasound for 60 minutes. Then, the mixture was stirred for another 2 hours. A brownish well-mixed slurry was formed. The solid part of the slurry was isolated by centrifugation at 3500 revolutions per minute for 15 minutes. The solid part was then redispered into deionized water and again separated from the mixture using centrifugation and worked up to obtain the composition.