NOVELTY - The bath deposition solution (5) for the wet-chemical deposition of a metal sulfide layer, comprises a metal salt, an organosulfide, a chelate complexing agent, which forms a chelate complex with metal ions of the metal salt, and ammonium hydroxide. The metal salt is zinc salt and/or indium salt. The organosulfide is thioacetamide and/or the chelate complexing agent is nitrilotriacetic acid and iminodiacetic acid or a metal salt of the nitrilotriacetic acid and iminodiacetic acid. The metal salt is contained in a concentration of 1-50 mM.    USE - Bath deposition solution for the wet-chemical deposition of a metal sulfide layer useful during the manufacturing of thin film photovoltaic devices and deposition for solar cells applications.    ADVANTAGE - The bath deposition solution ensures simple and efficient wet-chemical deposition of the metal sulfide layer with high quality.    DETAILED DESCRIPTION - The bath deposition solution (5) for the wet-chemical deposition of a metal sulfide layer, comprises a metal salt, an organosulfide, a chelate complexing agent, which forms a chelate complex with metal ions of the metal salt, and ammonium hydroxide. The metal salt is zinc salt and/or indium salt. The organosulfide is thioacetamide and/or the chelate complexing agent is nitrilotriacetic acid and iminodiacetic acid or a metal salt of the nitrilotriacetic acid and iminodiacetic acid. The metal salt is contained in a concentration of 1-50 mM, the organosulfie is contained in a concentration of 1-150 mM, the chelate complexing agent is contained in a concentration of 0.01-1.0 M and/or the ammonium hydroxide is contained in a concentration of 0.01-3.0 M. The bath deposition solution has a pH-value in the basic area up to in the neutral area. INDEPENDENT CLAIMS are included for:    (1) a method for producing a bath deposition solution; and    (2) a method for producing a metal sulfide layer on a substrate using a bath deposition solution.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a unit for the wet-chemical deposition of a metal sulfide layer (Drawing includes non-English language text).    Reaction container (1)    Substrate (2)    Chemical bath (3)    Mixing container (4)    Bath solution. (5)