Fe-substituted lead-free double perovskites Cs2AgBi1-xFexBr6 (0 ? x ? 0.75) were synthesized via an acid-assisted solution route to investigate the impact of B-site electronic structure engineering. Structural analysis by synchrotron X-ray diffraction confirms the preservation of the cubic Fm-3m phase with systematic lattice contraction upon Fe incorporation. Optical measurements reveal an extension of light absorption up to ~1100 nm, associated with the formation of intermediate electronic states within the bandgap. Magnetic characterization indicates paramagnetic behavior with the emergence of low-temperature antiferromagnetic correlations (TN = 14.4–8.4 K), along with a modest magnetocaloric response (|?Smax| ? 0.42 J kg?¹ K?¹ at 7 T). Photoelectrochemical (PEC) measurements under chopped illumination demonstrate a significant enhancement in photocurrent density with increasing Fe content, reaching ?13 ?A cm?² at 0 V vs Ag/AgCl for x = 0.50, accompanied by a shift in the switching potential. These results indicate that Fe incorporation modifies the electronic structure, enabling both magnetic correlations and improved interfacial charge-transfer processes. Overall, B-site engineering provides a strategy to tune multifunctional properties in lead-free double perovskites.
Comissão Organizadora
Pedro Alves da Silva Autreto
Comissão Científica
Ferramenta completa de submissão, avaliação e publicação de anais para eventos científicos.
