Preparation of bismuth-based perovskite Cs3Bi2I6Br3 single crystal for X-ray detector application

Cs3Bi2I6Br3 perovskite is one of the bismuth iodide family compounds. Because it contains no toxic lead, and has high stability in air and humidity, endowing a potential application prospects in photoelectric and radiation detectors. Herein, the Cs3Bi2I6Br3 single crystal (phi 13 x 65 mm(3)) with a (001) preferred direction was grown by using the melt method with solvent-synthesized polycrystalline particles, and the thin single wafer with a thickness up to 0.95 mm was obtained. The as-grown single crystal possesses high infrared transmittance of up to 70% in the range from 400 to 4000 cm(-1) and an optical band gap of about 2.03 eV estimated from the visible absorption curve. A highly intrinsic resistivity 2.3 x 10(10) ohm center dot cm and a dielectric constant about 10 were obtained from the electrical performance parameter measurements. The X-ray sensitivity of the X-ray detector is 55.62 mu C/Gy(air)/cm(2) (incident dose rate 0.24 mGy/s), as well as the signal-to-noise ratio, is up to 301. These results indicate Cs3Bi2I6Br3 single crystals are a potential material for X-ray detection.

Automated summary

Cs3Bi2I6Br3 perovskite is a potential material for photoelectric and radiation detectors due to its lack of toxic lead, high stability in air and humidity. Single crystals of Cs3Bi2I6Br3 were grown with a preferred direction of (001) and exhibited high infrared transmittance and an optical band gap of about 2.03 eV. The electrical performance parameters showed a highly intrinsic resistivity and a dielectric constant, while the X-ray detector demonstrated a high X-ray sensitivity and signal-to-noise ratio, making Cs3Bi2I6Br3 a promising material for X-ray detection.