Direct detection of circularly polarized light (CPL) is a challenging task due to limited materials and ambiguous structure–property relationships that lead to low distinguishability of the light helicities. Perovskite ferroelectric semiconductors incorporating chirality provide new opportunities in dealing with this issue. Herein, a pair of 2D chiral perovskite ferroelectrics is reported, which have enhanced CPL detection performance due to interplays among lattice, photon, charge, spin, and orbit. The chirality‐transfer‐induced chiral&polar ferroelectric phase enhances the asymmetric nature of the photoactive sublattice and achieves a switchable self‐powered detection via the bulk photovoltaic effect. The single‐crystal‐based device exhibits a CPL‐sensitive detection performance under 430 nm with an asymmetric factor of 0.20 for left‐ and right‐CPL differentiation, about two times that of the pure chiral counterparts. The enhanced CPL detection performance is ascribed to the Rashba–Dresselhaus effect that originates from the bulk inversion asymmetry and strong spin–orbit coupling, shown with a large Rashba coefficient, which is demonstrated by density functional theory calculation and circularly polarized light excited photoluminescence measurement. These results provide new perspectives on chiral Rashba ferroelectric semiconductors for direct CPL detection and ferroelectrics‐based chiroptics and spintronics.

Scheme 1. Two main strategies for WCPL generation: a) Multi-component systems via physical mixing or chemical mixing; b) Single-component systems via emission mechanisms of either two-emission mechanism (LE+CT or Fl+Ph) or STE.

Green, self-powered, flexible, and tunable features have been greatly desired to satisfy the increasing demands for next-generation photodetectors and sensors. Here, we report a 1D lead-free perovskite ferroelectric HDA-BiI 5 (HDA = hexane-1,6diammonium) based photodetector showing a spectrally selective linear polarized light response due to a unique linear dichroic conversion behavior. The HDA-BiI 5 single crystal device shows an orthogonal reverse of polarization-sensitive photocurrent and can distinguish linearly polarized light in different wavelength ranges with the photocurrent anisotropy ratio ω of about 1.37 at 405 nm, 1.00 at 490 nm, and 1.17 at 530 nm. Importantly, the device achieves a ferroelectricity-driven self-powered detection with an excellent ω (∼1.28 at 405 nm) and a high detectivity D* of 5.3 × 10 8 Jones. This research provides a pathway for the design of future integratable polarization-sensitive photodetectors.

Reported here are two new metal-chalcogenide-cluster-based frameworks, in which P1-ZnSnS clusters are linked each other by both corner-shared S2- ion and single metal ion of Zn2+ (or Sb3+) to form...

Materials emitting circularly polarized luminescence (CPL) have been intensively studied for their promising applications in various fields. However, developing tunable and responsive CPL materials in a wide wavelength range remains a great challenge. Here, a pair of chiral (R,R/S,S-DCDA) 3 Sb 2 Cl 12 (DCDA = dimethyl-1,2-cyclohexanediamine divalent cation) shows efficient broadband yellow emission with a photoluminescence (PL) quantum yield of 27.6% with a CPL asymmetry factor of 3 × 10 −3 . The associated chiroptical activity is attributed to the efficient chiral transfer as well as the self-trapped exciton emission originating from the large distortion of the inorganic blocks. Notably, (R,R/S,S-DCDA) 3 Sb 2 Cl 12 exhibits a large red-shift emission exceeding 100 nm upon lowering temperature. An excellent linear correlation of the PL wavelength on temperature indicates that the compounds can be used as PL thermometers, which originates from a temperaturedependent linear structural distortion of the [SbCl 6 ] emitter. This work inspires the potential utilization of CPL-emitting materials as responsive light sources.