Cubic halide perovskites in the Cs(Pb1−xSnx)(Br3−yCly) solid solutions for crack-free Bridgman grown single crystals.

Bridgman grown CsPbBr₃ single crystals have demonstrated γ-ray spectra with a high resolution, making them a highly promising competitor for the current benchmark room-temperature radiation detector Cd_1−xZn_xTe. However, CsPbBr₃ crystal growth is a very slow process that oftentimes results in cracked ingots due to phase transitions from cubic to orthorhombic crystal systems. In this report, we demonstrate the stabilization of a room-temperature cubic phase in Cs(Pb_1−xSn_x)(Br_3−yCl_y) solid solutions to overcome this issue. Cs(Pb_0.75Sn_0.25)(Br_1.00Cl_2.00) was identified as the most promising composition and grown as a crack-free ingot using Bridgman growth in around one week. [ABSTRACT FROM AUTHOR]