Patterned Chiral Perovskite Film for Self‐Driven Stokes Photodetectors

Abstract

Polarization detection plays an essential role in a wide range of fields, including target identification, 3D reconstruction, and robotic vision. Self‐driven on‐chip full‐Stokes photodetectors are urgently required to meet the trend of miniaturization and integration. Nevertheless, how to fulfill efficient circular and linear polarimetry simultaneously with sufficient recognition effectiveness in a compact device is a great challenge. Herein, a patterned chiral perovskite film is fabricated by imprinting strategy, and vertically‐structured self‐driven Stokes photodetector is demonstrated, which can recognize various polarization states at 0 V. Through patterned design of the chiral perovskite film by integrating circle and nanowire structure, flexible tuning of circular and linear polarization components within the detector is achieved, enabling the detector to strike a balance between circular and linear polarization detection ability when recognizing arbitrary polarization light. The maximum circular polarization sensitivity factor and linear polarization ratio can reach 0.125 and 1.5, respectively. By optimizing well‐defined patterned shape, the resultant detector can recognize polarized light with an average recognition error <7%. This work opens an avenue toward the fabrication of self‐driven filterless Stokes detectors based on patterned chiral perovskite film for accurate detection of arbitrary polarization states.

On-Wire Design of Axial Periodic Halide Perovskite Superlattices for High-Performance Photodetection

“…Nanowires with predictable and controllable optoelectrical properties − can be rationally constructed by complex compositional modulated processes, for example, multistep ion exchange, , ion doping, and restricted phase transformation process. ,, So far, a large number of semiconductor heterojunction nanowires have been reported, − not only for traditional group II–VI and III–V semiconductors but also for the freshly emerged promising perovskite materials. Some examples include CdSe–ZnSe heterostructure nanowires, CdS/CdS:SnS 2 superlattice nanowires, CdS–Ag 2 S superlattice nanorods, Si-SiGe superlattice nanowires, GaAs-GaP superlattice structures, GaAs/GaAsSb nanowires superlattice, InAs–InP heterostructures, etc.…”