Abstract
We utilized Ab-initio calculations to study electronic, structural, magnetic, and thermoelectric characteristics for Cs2GeCl/Br6 halides that were either undoped or doped with Manganese (Mn). We evaluated the total energy variation among ferromagnetic (FM) and antiferromagnetic (AFM) phases to determine the ferromagnetic structural stability of Mn-doped Cs2GeCl/Br6 halides. In addition, structural stability also justified through the calculations of elastic properties. To make precise predictions about the electronic properties of both undoped and Mn-doped Cs2GeCl/Br6 halides, we used modified Becke-Johnson local density approximation functional. Mn-doped Cs2GeCl/Br6 halides demonstrated FM semiconducting behavior, as indicated by their band structures and density of states plots, which are reported by magnetic moments and crystal field splitting energies. We systematically explored the thermoelectric characteristics by calculating parameters such as electrical and thermal conductivities, Seebeck coefficient, and Figure of merits. The Mn-doped Cs2GeCl/Br6 halides demonstrated a large value for Figure of merit and inconsequential lattice thermal conductivity, making them particularly suitable for thermoelectric applications.
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