Enhancing the Optoelectronic Properties of Copper Sulphide Nanoparticles for Photovoltaic Applications

In this work, the co-precipitation method is used for the synthesis of copper sulfide (CuS) nanoparticles for use in solar cells. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), UV-Visible spectroscopy (UV-Vis), photoluminescence spectroscopy (PL), and Fourier transform infrared spectroscopy (FTIR) are used to analyse the synthesized CuS nanoparticles. CuS nanoparticles with hexagonal phases and crystallite sizes ranging from 19 nm to 24 nm are identified by X-ray. The morphology of the SEM images changes from being asymmetrical to spherical. UV-Vis spectroscopy was carried out for the optical analysis of the synthesized powder. The band gap of the samples is determined using a tauc plot, and it is found to be decreasing with an increase in sulfur concentration, going from 2.01 eV to 1.88 eV. Surface imperfections and green emission bands related to electro-hole recombination are visible in PL spectra. Cu-S stretching vibrations are present at 618 cm -1 , according to FTIR spectra.