Solution Growth and Performance Study of Cs2AgBiBr6 Single Crystal

Abstract Cs 2 AgBiBr 6 high purity polycrystalline powders are synthesized by solution method. The millimeter‐sized Cs 2 AgBiBr 6 crystals are obtained by cooling method with hydrobromic acid as solvent. Powder X‐Ray diffraction (XRD) analysis shows that the crystal is of cubic structure and its lattice constant is a = b = c =11.2562 Å. Optical absorption property is tested by ultraviolet‐visible (UV‐Vis) spectrophotometer. The results show that the absorption edge of the Cs 2 AgBiBr 6 crystal is at about 593 nm and the band gap value is 2.12 eV. In addition, the thermogravimetric analysis/differential thermal analysis (TG/DTA) curves of Cs 2 AgBiBr 6 crystal at 20–800 °C are measured. The thermal decomposition mechanism of Cs 2 AgBiBr 6 crystal is analyzed. The results show that Cs2AgBiBr6 crystal with high quality can be prepared by solution method, and it has potential application advantages in the field of photoelectric devices.