Abstract
AbstractCs2AgBiBr6 high purity polycrystalline powders are synthesized by solution method. The millimeter‐sized Cs2AgBiBr6 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 Cs2AgBiBr6 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 Cs2AgBiBr6 crystal at 20–800 °C are measured. The thermal decomposition mechanism of Cs2AgBiBr6 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.
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