TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The aqueous solution-I further comprises a dynamic equilibrium state of the first concentration and the second concentration subjected to an electrical bias applied between an anode immersed in it and a cathode made from a metalized substrate moving with a speed, where the dynamic equilibrium state comprises a decrease of the first concentration down to 0.1 mole and the second concentration down to 0.05 mole for electroplating a gallium-selenium film over the metalized substrate at a temperature of 15-28 degrees C and an increase of the first concentration up to 3 mole and the second concentration up to 0.2 mole by adding a certain amount of the aqueous solution. The aqueous electroplating solution-II further comprises a dynamic equilibrium state of the concentration subjected to an electrical bias applied between an anode immersed in it and a cathode made from a metalized substrate moving with a speed, where the dynamic equilibrium state comprises a decrease of the concentration down to 0.1 mole for electroplating a selenium-metal alloy film over the metalized substrate at a temperature of 10-50 degrees C and an increase of the concentration up to 7 mole by adding a certain amount of the aqueous electroplating solution. The gallium ions are obtained from a gallium salt added into the water, where the gallium salt is gallium chloride, gallium nitride, gallium sulfate, gallium acetate or gallium nitrate. The selenium ions are obtained from a compound added into the water, where the compound is selenium acid, selenous acid, selenium dioxide or selenium trioxide. The dynamic equilibrium is monitored by a controller using a feedback signal based on an average thickness of the gallium-selenium film measured by one or more X-ray fluorescence spectrometry moved at the same speed as the metalized substrate. The dynamic equilibrium is maintained, at least by adjusting the electrical bias, temperature of 15-28 degrees C or 10-50 degrees C, the speed of the moving metalized substrate, and the added certain amount of the aqueous solution or aqueous electroplating solution based on the feedback signal from the controller.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The complexing agent comprises glucoheptonic acid sodium salt, polyethylene glycol, sodium lauryl sulfate, sodium ascorbate, sodium salicylic, glycine, sodium tartrate or sodium citrate. EXAMPLE - No suitable example given.