Abstract

• The Copper Zinc Sulphide (CuZnS2) films were fabricated with and without complexing agents (EDTA and TEA) by chemical bath deposition method. Incorporation of complexing agents provided the higher optical absorption, lower band gap energy, and smoother surface of CuZnS2 thin films. In addition, varying the concentration of precursor solution (0.5 – 1.5 M) and dipping time (24 – 72 hrs) the optical property and surface topography of thin films were investigated. The concentration ( 0.5 M ) and dipping time (48 hrs) provided the lower band gap energy of 2.0 eV and RMS surface roughness of 0.93 µm which are key requirements for light absorber layer in solar cells.