Abstract
In the current study, we successfully prepared Cu2ZnSnS4 (CZTS) microparticles using the hydrothermal method at 180 °C, where thiourea was used as a sulphur precursor. To investigate the growth mechanism of CZTS, time-dependent X-ray diffraction (XRD)pattern was studied. The morphology and shape of the synthesized microparticles were examined by field emission scanning electron microscopy (FE-SEM). UV-DRS(UV- Diffusion Reflectance Spectrometer) studies were used to study the optical properties. The morphology played a vital role in the formation of CZTS. This is clearly observed in SEM images where there is a transformation from agglomeration to a hierarchical flower-like structure. The synthesized powder using hydrothermal processes demonstrated the Cu2ZnSnS4 is formed in kesterite phase. The band gap of as-produced CZTS microparticles determined by UV-DRS spectra measurements was 1.57 eV, which is close to the ideal value for photo absorption applications. We analyze the changes in surface properties of particles using X-ray photoelectron spectroscopy (XPS). Understanding the mechanism in preparation of such hierarchical flower like CZTS enables the application of such structure in a wide sector, including photocatalysis and photovoltaics.
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