Chiral Quasi-2D Hybrid Perovskite p-n Junction Arrays for High-Performance Self-Powered Visible-Band Circularly Polarized Light Detection.

Highly sensitive circularly polarized light (CPL) detectors are essential for optical communication and sensing. Nevertheless, while certain CPL detectors employing single-component and polycrystalline perovskite active layers are capable of broad-spectrum detection range, the majority of such devices still suffer from substantial carrier recombination, leading to high energy consumption. The rational design of high-quality p-n junctions provide a promising strategy for achieving efficient carrier separation and self-powered operation. Here, we present a high-performance, self-powered CPL detector based on quasi-two-dimensional (quasi-2D) chiral hybrid perovskite (CHP) p-n junction microwire (MW) arrays constructed from [(R)/(S)-β-MPA]2(MA)n-1PbnBr3n+1 and [(R)/(S)-β-MPA]2(MA)n-1PbnBr3n+1-xIx (MPA = methylphenylethylamine, MA = methylammonium). The built-in electric field of the p-n junction, the chiral-induced spin selectivity (CISS) effect of the CHPs, and the high crystallinity with ordered crystallographic alignment of the arrays collectively enable high-performance self-powered CPL detection. The device exhibits excellent CPL sensitivity across a broad spectral range of 405-556 nm, with a maximum photoresponsivity (Rmax) of 37.7 A W-1 under 510 nm illumination, an anisotropy factor (gIph) of 0.37, and a high photocurrent on/off ratio (Ion/Ioff) of 1.29 × 104 under 0 V bias. These superior performances highlight the device's great potential for polarization-based optical communication and encryption applications.