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Cu2ZnSnS4 (CZTS) absorber layers, treated with post sulfurization, were successfully grown on Mo/soda lime glass substrates by electro-deposition at room temperature. Electro-deposition is such a method that has the advantages of high quality, low-cost, high-efficiency, high production, vacuum-less and good void fill ability. In this work, a two-electrode arrangement system was used and worked at galvanostat setting. The CZTS was electro-deposited through single-step processes using sodium citrate (Na3C6H5O7) and tartaric acid (C4H6O6) as the complexing agents. The as electro-deposited CZTS films were treated with post sulfurization using sulfur vapor. The crystallinity of the as electro-deposited CZTS was improved through the post-sulfurization. The as-formed CZTS was analyzed using FE-SEM, XRD and Raman Spectrometer. The CZTS films exhibit polycrystalline kesterite structures with preferred XRD orientation on (112), (220), (312) planes. The optical band gap energy was ~1.25 eV which was a suitable value for solar cell application. [ABSTRACT FROM AUTHOR]