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Single crystals of Cs2BiAgBr6 lead-free perovskite were grown bycrystallization from supersaturated solution. According to characterization byXRD and EBSD methods the double perovskite single crystal are of the cubicFm-3m symmetry with the lattice constant a = 11.20 {\AA}. DFT predictions basedon the single crystal X-ray diffraction analysis reveal that the material is anindirect band gap semiconductor. Low temperature (1.4 K) photoluminescencespectra demonstrate three broadened bands that correspond to two lowestcomputed indirect and one direct band-to-band transitions.

Microstructural analysis and optical properties of Cs2BiAgBr6 halide double perovskite single crystals