Density Functional Theory Unveils the Secrets of SiAuF₃ and SiCuF₃: Exploring Their Striking Structural, Electronic, Elastic, and Optical Properties

In the quest for advanced materials with diverse applications in optoelectronics and energy storage, we delve into the fascinating world of halide perovskites, focusing on SiAuF₃ and SiCuF₃. Employing density functional theory (DFT) as our guiding light, we conduct a comprehensive comparative study of these two compounds, unearthing their unique structural, electronic, elastic, and optical attributes. Structurally, SiAuF₃ and SiCuF₃ reveal their cubic nature, with SiCuF₃ demonstrating superior stability and a higher bulk modulus. Electronic investigations shed light on their metallic behavior, with Fermi energy levels marking the boundary between valence and conduction bands. The band structures and density of states provide deeper insights into the contributions of electronic states in both compounds. Elastic properties unveil the mechanical stability of these materials, with SiCuF₃ exhibiting increased anisotropy compared to SiAuF₃. Our analysis of optical properties unravels distinct characteristics. SiCuF₃ boasts a higher refractive index at lower energies, indicating enhanced transparency in specific ranges, while SiAuF₃ exhibits heightened reflectivity in select energy intervals. Further, both compounds exhibit remarkable absorption coefficients, showcasing their ability to absorb light at defined energy thresholds. The energy loss function (ELF) analysis uncovers differential absorption behavior, with SiAuF₃ absorbing maximum energy at 6.9 eV and SiCuF₃ at 7.2 eV. Our study not only enriches the fundamental understanding of SiAuF₃ and SiCuF₃ but also illuminates their potential in optoelectronic applications. These findings open doors to innovative technologies harnessing the distinctive qualities of these halide perovskite materials. As researchers seek materials that push the boundaries of optoelectronics and energy storage, SiAuF₃ and SiCuF₃ stand out as promising candidates, ready to shape the future of these fields.