Dhaka University Journal of Applied Science & Engineering

• M Rahman
  Department of Physics, Dhaka University, Bangladesh
• M S Bashar
  IFRD, BCSIR, Dhaka, Bangladesh
• N Islam
  Department of Physics, Dhaka University, Bangladesh

Manufacture of eco-friendly CZTS (Cu₂ZnSnS₄) thin film absorption layer of pure keserite structure for solar cell is far-reaching. We have manufactured the CZTS thin films by sol-gel dip-coating means from the nitrate-based chemicals. After hardening at 550°C in vacuum condition, we characterize the films by UV–vis spectroscopy, X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and energy dispersive X-ray spectroscopy (EDS) methods. The CZTS films provided high optical absorption coefficient (2.92x10⁴cm^-1) and average band gap energy (1.58 eV). X-ray diffraction analysis proved the kesterite structure of films. The surface morphology analysis proved the deposition of crammed, condensed and granulated CZTS films. The thin films have intermittent disposal of agglomerated particles with clear-cut edges. The energy dispersive X-ray spectroscopy analysis conferred stoichiometric ratio as Cu: Zn: Sn: S= 2.1: 1.3: 1: 5.2

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