Optical and Structural Study of the CZTS (Cu2ZnSnS4) Thin Film for Solar Cell Derived from the Chloride-Based sol-gel Precursor Solution
Keywords:Thin film, Sol-gel, Absorption layer, Solar cell, Cu2ZnSnS4, XRD, SEM, EDS.
Fabrication of environmentally safe C2ZnSnS4 (CZTS) photovoltaic thin films of pure kesterite state is crucial. We have prepared
CZTS thin films by sol-gel dip-coating process from chloride-based chemicals. After vacuum-annealed at 550°C, the optical and
structural characters of the films were further examined by UV–vis spectroscopy, X-ray diffraction (XRD), scanning electron
microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS) methods. The CZTS films offered high optical absorption
(0.4x104cm-1) and nearly optimum bandgap energy (1.65e V). X-ray diffraction examination confirmed the kesterite structure of
films. Scanning electron micrograph affirmed the creation of jam-packed, condensed and granulated CZTS films. The thin film
displayed intermittent disposal of agglomerated particles with clear-cut edges. The energy dispersive X-ray spectroscopy study gave
the stoichiometric ratio as Cu: Zn: Sn: S= 2.2: 1.4: 1: 5.1.
Dhaka Univ. J. Sci. 70(1): 1-7, 2022 (January)