Search

In this study, solar cells based on pure Cs 2 AgBiBr 6 and Al-doped metal were fabricated using the sol-gel spin-coating technique. X-ray diffraction (XRD) analysis confirmed the formation of cubic-structured films for both pure and Al-doped. Notably, the grain size of Al-doped Cs 2 AgBiBr 6 was observed to be larger than that of its pure counterpart. The optical properties of these films were investigated using UV-vis spectroscopy, revealing essential parameters such as the bandgap energy ( E g ), refractive index ( n ), extinction coefficients ( k ), and dielectric constant. While the pure film exhibited an E g of 1.91 eV, the Al-doped film demonstrated a slightly lower E g of 1.82 eV. Utilization of these films in solar cell fabrication yielded intriguing results. The J - V curve shows that the pure solar cell displayed a short-circuit current density ( J sc ) of 5.01 mA/cm 2 , a fill factor (FF) of 0.67, an open-circuit voltage ( V oc ) of 0.89 V, and an efficiency of 3.02%. Al doping led to improvements, with an increase in V oc to 0.91 V, FF to 0.71, and J sc to 5.29 mA/cm 2 . Consequently, the overall efficiency surged to 3.40%, marking a substantial 12.5% enhancement compared with the pure solar cell. These findings underscore the efficacy of Al doping in enhancing the performance of Cs 2 AgBiBr 6 -based solar cells., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)

Manganese-doped bismuth ferrites were synthesized using the coprecipitation method with the green extract Azadirachta indica . Our incorporation of the transition element, manganese, into bismuth ferrites tackles the challenge of increased leakage current often observed in intrinsic bismuth ferrites. We gained key insights through a comprehensive examination of the structural, dielectric, and optical properties of these materials, utilizing Fourier transform infrared spectroscopy (FTIR), impedance spectroscopy, and UV-visible spectroscopy, respectively. The formation of an octahedral geometry was confirmed using the FTIR technique. UV-visible spectroscopy indicated that 2% Mn doping is optimal, while we obtained a low band gap energy (2.21 eV) and high refractive index (3.010) at this amount of doping. The manufactured materials exhibited the typical ferrite-like dielectric response, that is, the dielectric parameter gradually decreased as the frequency increased and then stayed constant in the high-frequency range. Using the diphenylpicrylhydrazyl (DPPH) free radical assay, we also examined the antioxidant activity of bismuth ferrites. We concluded that among different Mn-doped BiFeMnO 3 -based nanomaterials, the 2 wt % Mn-doped BiFeMnO 3 shows the highest antioxidant activity. This finding substantiates the efficacy of the optimized material with regard to its potent antioxidant activity, positioning it as a promising candidate for potential biomedical applications., Competing Interests: The authors declare no competing financial interest., (© 2023 The Authors. Published by American Chemical Society.)