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

Abstract

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)‐β‐MPA]4AgBiI8 ((R)‐β‐MPA=(R)‐(+)‐β‐methylphenethylammonium, 1‐R), and [(S)‐β‐MPA]4AgBiI8 ((S)‐β‐MPA=(S)‐(−)‐β‐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.

Bismuth/Silver-Based Two-Dimensional Iodide Double and One-Dimensional Bi Perovskites: Interplay between Structural and Electronic Dimensions

“…After the first report of iodide 2D double perovskite using aromatic diammonium cations, 23 they were also synthesized with aliphatic diammonium cations [24][25][26] and monoammonium cations 25,27 . They have demonstrated interesting features such as ferroelectricity, X-ray detection 28 and even circularly polarized light detection 29 .…”

Circularly Polarized Photodetectors Based on Chiral Materials: A Review

“…detection is achieved without an external power source (unprecedentedly). Furthermore, an anisotropy factor up to 0.3 is obtained for the self-powered CPL detection, reaching the highest value among reported chiral perovskites (Li et al, 2021). To further achieve the detection of Stokes parameters, Zhao et al developed Stokes-parameter photodetectors based on singlecrystalline chiral-perovskite nanowire arrays.…”

Chirality Transfer from Chiral Mesoporous Silica to Perovskite CsPbBr 3 Nanocrystals: The Role of Chiral Confinement

“…Chiral perovskites have attracted considerable attention due to their particular optical and optoelectronic properties as well as tremendous potentials in circularly polarized light detection, [1][2][3] CPL, [4][5][6][7] nonlinear optics, [8][9][10] ferroelectrics, [11][12][13][14] and spintronics etc. [15][16][17] Generally, there have been four strategies to be employed for obtaining chiral perovskites.…”