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The diversity of halide materials related to important solar energy systemssuch as CsPbX3 (X = Cl, Br, I) is explored by introducing the transition metalelement Fe. In particular a new compound, Cs3Fe2Br9 (space group P6_3/mmc witha = 7.5427(8) and c = 18.5849(13) {\AA}), has been synthesized and found tocontain 0D face-sharing Fe2Br9 octahedral dimers. Unlike its isomorph,Cs3Bi2I9, it is black in color, has a low optical bandgap of 1.65 eV andexhibits antiferromagnetic behavior below TN = 13 K. Density functional theorycalculations shed further light on these properties and also predict that thematerial should have anisotropic transport characteristics.

Synthesis, Crystal Structure, Magnetic and Electronic Properties of the Caesium-based Transition Metal Halide Cs3Fe2Br9