NOVELTY - The process for preparing an absorber thin film for photovoltaic cells, comprises electrochemically depositing mixed oxides and/or hydroxides and oxide from elements of group 11, 12, 13 and 14 to a thin layer at a temperature of 5-95 degrees C, annealing the thin layer in a reducing atmosphere at a temperature of 300-650 degrees C for 20 seconds to 15 minutes, and supplying an element from group 16 to the thin layer.    USE - The process is useful for preparing an absorber thin film for photovoltaic cells or solar cells (claimed).    ADVANTAGE - The process is capable of economically and easily preparing an absorber thin film with excellent photovoltaic properties and controlled composition thus improving the life and performance of the solar cells.    DETAILED DESCRIPTION - The process for preparing an absorber thin film for photovoltaic cells, comprises electrochemically depositing mixed oxides and/or hydroxides and oxide from elements of group 11, 12, 13 and 14 to a thin layer at a temperature of 5-95 degrees C, annealing the thin layer in a reducing atmosphere at a temperature of 300-650 degrees C for 20 seconds to 15 minutes, and supplying an element from group 16 to the thin layer. The absorber thin film is of A-B-C2 or A2-(Dx, E1-x)-C4-type, where 0 less than or equal to x less than or equal to 1, A is copper and/or silver, B is indium, gallium and/or aluminum, C is selenium and/or sulfur, D is an element or mixture of group 12 elements and E is an element or mixture of group 14 elements. An aqueous solution, comprising a mixture of salts A and B for the A-B-C2 layer and a mixture of salts A, D and/or E for A2-(Dx, E1-x)-C4 layer, is prepared in the presence of given oxygen species before electrochemical deposition. The oxygen species comprises nitrate ion, dioxygen, hydrogen peroxide or hypochlorites. The electrochemical deposition is produced by imposing a current density of 1-30 mAcm-2 and a voltage of -1.8 V to -0.5 V to an electrode comprising an insulating substrate (12) covered with a molybdenum layer (14) and to a reference electrode comprising saturated mercury/mercurous sulfate/potassium sulfate. The atomic ratio of the elements A and B in the electrolyte solution is 0.2-1.5. The ratio of concentrations of indium and gallium in the electrolyte solution is 0.2-1.5.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a photovoltaic cell.    Insulating substrate (12)    Molybdenum layer (14)    Absorbing layer (16)    Interfacial layer (18)    Zinc oxide layer. (20)