Enantiomeric lead-free double perovskites rationally designed by achiral-chiral cation intercalation

Chiral optical materials have attracted great attention in multiple disciplines due to their wide application value in fields such as remote sensing, three-dimensional display, information communication, and optical information storage. With the strong demand for stable and environmentally-friendly materials, two-dimensional, chiral, lead-free halide double perovskites are expected to generate rich chiroptical and optoelectronic properties.