Chiral Lead-Free Hybrid Perovskites for Self-Powered Circularly Polarized Light Detection

Metal-halide perovskites are recently emerging as the promising alternative for CPL detection owing to their CPL-sensitive property induced by chiral organics and efficient charge transport of inorganic frameworks. However, most of these reported chiral perovskites involve high concentrations of toxic Pb which will become the potential bottleneck for their further application. Herein, we successfully developed two lead-free halide double perovskites, [(R)-beta-MPA](4)AgBiI8 ((R)-beta-MPA=(R)-(+)-beta-methylphenethylammonium, 1-R), and [(S)-beta-MPA](4)AgBiI8 ((S)-beta-MPA=(S)-(-)-beta-methylphenethylammonium, 1-S). Circular dichroism measurements reveal that these perovskites exhibit notable chirality induced by organic cations to distinguish different polarization states of CPL photons. Significantly, they present unique chiral polar photovoltaic, and resulting self-powered CPL detection without an external power source is unprecedentedly achieved. Furthermore, an anisotropy factor up to 0.3 is acquired for the self-powered CPL detection, reaching the highest value among reported chiral perovskites. This work suggests hybrid double perovskites are promising photoelectronic candidates, and provides a new approach for exploring new green circularly polarized light-sensitive materials with high performance.

Automated summary

Metal-halide perovskites have emerged as promising alternatives for CPL detection due to their CPL-sensitive property induced by chiral organics and efficient charge transport of inorganic frameworks. This study successfully developed lead-free halide double perovskites, demonstrating significant chirality and self-powered CPL detection capabilities. The research suggests that hybrid double perovskites can be promising photoelectronic candidates for exploring new green circularly polarized light-sensitive materials with high performance.