A chiral two-dimensional perovskite-like lead-free bismuth(III) iodide hybrid with high phase transition temperature.

Bismuth(III) iodide perovskites have attracted great attention as lead-free hybrid semiconductors, but they mainly show zero- and one-dimensional structures. Herein, we report the first two-dimensional chiral perovskite-like bismuth(III) iodide hybrid [( S )-3-aminopyrrolidinium I] 2 Bi 2/3 I 4 ( 1 ) with a high phase transition temperature of 408.8 K, higher than most of the reported chiral lead-free hybrid semiconductors.