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

Bridgman grown CsPbBr 3 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− x Zn x Te. However, CsPbBr 3 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− x Sn x )(Br 3− y Cl y ) solid solutions to overcome this issue. Cs(Pb 0.75 Sn 0.25 )(Br 1.00 Cl 2.00 ) was identified as the most promising composition and grown as a crack-free ingot using Bridgman growth in around one week. Graphical abstract