Lead-free halide perovskite Cs3Bi2Br9 single crystals for high-performance X-ray detection

All-inorganic lead-free halide perovskites have attracted interest owing to their high ambient and thermal stabilities, excellent optoelectronic properties, and environmental friendliness. Herein, the bismuth-based halide perovskite Cs3Bi2Br9 single crystals were successfully grown to a diameter of 12 mm and length of 40 mm using a modified Bridgman method for the first time. The resistivity and transmittance of transparent and crack-free Cs3Bi2Br9 single crystal are similar to 6.8x10(11) Omega cm and similar to 80%, respectively. The carrier mobility of the (-120) plane is 0.17 cm(2) V-1 s(-1) along the [010] orientation (b axis), and the trap density is 9.7x10(10) cm(-3). Moreover, Cs3Bi2Br9 single crystals exhibit excellent potential for X-ray detection, including a high absorption coefficient, a superior X-ray sensitivity of similar to 230.4 mu C Gy(air)(-1) cm(-2), and an ultra-low and no-drift dark current density of similar to 17.8 pA mm(-2), which enables lower noise and is also beneficial to the ultra-low detection limit for X-ray detectors. Our study shows that Cs3Bi2Br9 is a promising candidate for X-ray detection applications.

Automated summary

This study successfully grew bismuth-based halide perovskite Cs3Bi2Br9 single crystals to a diameter of 12 mm and length of 40 mm using a modified Bridgman method for the first time. The crystals exhibit excellent potential for X-ray detection applications, with high sensitivity, low noise, and promising performance.