Circularly polarized light (CPL) detection has emerged as a key technology for various optoelectronics. Chiral hybrid perovskites (CHPs) that combine CPL-sensitive absorption induced by chiral organic ligands and superior photoelectric properties of perovskites are promising candidates for direct CPL detection. To date, most of the CHP detectors are made up of polycrystalline thin-film, which results in a rather limited discrimination of CPL due to the existence of redundant impurities and intrinsic defect states originating from rapid crystallization process. Here, it is developed a direct CPL detector with high photocurrent and polarization selectivity based on low-defect CHP single-crystal nanowire arrays. Large-scale CHP nanowires are obtained through a micropillar template-assisted capillary-bridge rise approach. Thanks to the high crystallinity and ordered crystallographic alignment of these arrays, a CPL photodetector with high light on/off ratio of 1.8 × 10 4 , excellent responsivity of 1.4 A W −1 , and an outstanding anisotropy factor of 0.24 for photocurrent has been achieved. These results would provide useful enlightenment for direct CPL detection in high-performance chiral optoelectronics.

Highly sensitive photodetectors play significant roles in modern optoelectronic integrated circuits. Constructing p–n junctions has been proven to be a particularly powerful approach to realizing sensitive photodetection due to their efficient carrier separation. Recently, p–n‐junction photodetectors based on organic–inorganic hybrid perovskites, which combine favorable optoelectronic performance with facile processability, hold great potential in practical applications. So far, these devices have generally been made of polycrystalline films, which exhibit poor carrier‐transport efficiency, impeding the further improvement of their photoresponsivities. Here, a type of ultrasensitive photodetector based on single‐crystalline perovskite p–n‐junction nanowire arrays is demonstrated. The single‐crystalline perovskite p–n‐junction nanowire arrays not only possess high crystallinity that enables efficient carrier transport but also form a built‐in electric field facilitating effective carrier separation. As a result, the devices show excellent photosensitivity over a wide spectral range from 405 to 635 nm with an outstanding responsivity of 2.65 × 102 A W−1 at 532 nm. These results will provide new insights into the design and construction of high‐performance photodetectors for practical optoelectronic applications.

We demonstrate high-performance photodetectors based on Eu-doped 2D perovskite nanowire arrays. The pure crystallographic orientation enables efficient carrier transport and the doped Eu ions effectively suppress the trap density in...

The realization of Stokes photodetectors accelerates the development of various modern optoelectronic applications. Chiral 2D perovskites with intrinsic chiral optical activity and superior carrier mobility are promising for next‐generation full‐Stokes polarization detection. So far, most of the chiral 2D metal‐halide perovskite‐based photodetectors suffer from limited discrimination of circularly polarized light due to the high exciton recombination rate in single‐phase perovskite, impeding the accurate measurement for Stokes parameters. Here, an on‐chip Stokes photodetector based on chiral 2D/quasi‐2D perovskite lateral heterojunction nanowire (NW) arrays with high polarization selectivity and photoresponsiveness is reported. The highly‐aligned heterojunction NW arrays not only build up a built‐in electric field for enhanced chiral discrimination, but also possess intrinsic anisotropy that enables outstanding linear polarization response. On this basis, the device exhibits reliable ability for polarization detection with a high anisotropy factor of 0.38, an outstanding polarized ratio of 1.5, and an excellent responsivity of 22.14 A W−1. These results will provide useful enlightenment for direct full‐Stokes polarization detection in optoelectronic integrated circuits.