Anion replacement effect on the structural, magnetoelectronic, and optical features of all inorganic halide double perovskites K 2 LiMoX 6 (X = Br, I) for spintronic and optical devices

Herein, the geometrical, magnetic, optoelectronic, thermoelectric features of K 2 LiMoX 6 (X = Br, I) have been simulated by DFT. The FP-LAPW approach is employed via Wien2k software. To confirm the thermodynamic and structural stability of the K 2 LiMoX 6 (X = Br, I) compounds, the tolerance factor ( tau) and formation enthalpy are calculated. The predicted spin -polarized band structure (BS) and density of states (DOS) display p -type semiconductor character via direct band gap at X -X symmetry points in both spin versions. The ferromagnetic (FM) character was confirmed from magnetic moments (M Tot ) which are 3.00090, and 3.00014 mu B for K 2 LiMoBr 6, and K 2 LiMoI 6, correspondingly. The materials light absorbance was observed in the range of visible to ultraviolet (UV) zone, thereby enhancing their significance for photocell and optoelectronic devices. In addition, both halides exhibit optimal figure of merit (ZT) which make these materials as promising candidates for efficient heat energy conversion technologies. The outcomes of the studied compounds provide a new path for researchers for the applications of spintronic and optical gadgets.