Theoretical Investigation of the Physical Features of Ternary (Emplectite) CuBiS2 and (Chalcostibite) CuSbS2: Photovoltaic Applications

Abstract First-principles evaluations were done to scrutinize the structural, electronic, and optical features of CuBiS2 and CuSbS2 ternary alloys. These calculations utilized the FP-LAPW (full potential-linearized augmented plane wave) technique within the framework of the DFT (density functional theory). To accurately model the exchange-correlation potential in total energy computations, the WC-GGA (Wu-Cohen generalized gradient approximation) was employed. For the band structure computations, the improved Becke–Johnson potential approximation has been utilized, which effectively addresses the band-gap underestimation typically seen in standard DFT approaches. The results showed that the calculated lattice constants and band-gap values of these ternary compounds closely match existing theoretical and experimental data. Furthermore, to explore the optical features of emplectite and chalcostibite, calculations were performed for refractive index, the reflectivity, dielectric function and absorption coefficient. The findings from the electronic and optical properties suggest that these ternary compounds could be highly beneficial for applications in photonics and photovoltaics, owing to their favourable characteristics.

• CuSbS2
• ternary chalcogenide alloys
• chalcostibite
• photovoltaic materials
• electronic band structure
• band gap
• optical properties
• refractive index
• dielectric function
• absorption coefficient
• lattice parameters

• Chalcogenide Semiconductor Thin Films
• Crystal Structures and Properties
• 2D Materials and Applications
• CuSbS2
• ternary chalcogenide alloys
• chalcostibite
• photovoltaic materials
• electronic band structure
• band gap
• optical properties
• refractive index
• Electrical and Electronic Engineering
• Electronic, Optical and Magnetic Materials
• Materials Chemistry
• Engineering
• Materials Science