Advancing optoelectronics: Exploring the superior performance of lead-free halide perovskites

In our study, we thoroughly examined the structural, electronic, and optical properties of halide double perovskites AgSb(Cl,Br) using density functional theory.The band structure analysis revealed that AgSbCl and AgSb possess semiconducting indirect band gaps of 1.64 eV and 2.44 eV, respectively.Furthermore, an investigation of the optical properties based on the complex dielectric function demonstrated that both compounds exhibit very high absorption coefficients in the order of 10 5 -1 in the visible and UV regions.These results highlight the adaptability of these materials, indicating their potential for optoelectronic devices.Advancing optoelectronics: Exploring the superior performance of lead-free halide perovskites  Optical Properties: III. Conclusion:In Fig. 4, we depict the absorption coefficients as a function of wavelength of Cs 2 AgSb(Cl,Br) 6 .Both compounds exhibit initial absorption peaks in the visible and ultraviolet spectra.Additionally, the highest absorption for both materials occurs within the ultraviolet range.Further-more, at 380 nm, AgSbBr absorbs at a rate of 2.38×10 5 -1 , while AgSbCl absorbs at a rate of 2.74×10 5 -1 , with absorption rates diminishing as the wavelength extends toward the infrared spectrum.When light interacts with the surface of a material, it undergoes simultaneous reflection, transmission, and absorption processes.