Chiral 2D/Quasi‐2D Perovskite Heterojunction Nanowire Arrays for High‐Performance Full‐Stokes Polarization Detection

Abstract

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.

Wafer-Scale Patterning Integration of Chiral 3D Perovskite Single Crystals toward High-Performance Full-Stokes Polarimeter

“…The performance of perovskite devices greatly relies on the crystallization quality and orientation of the perovskite crystals along with optoelectronic features such as carrier mobility and exciton binding energy. , To fabricate long-range ordered perovskite crystals, numerous methods such as hot casting, composition engineering, solvent engineering, and surface modification have been developed, which effectively reduce grain boundaries and defects in perovskite films. To further improve the performance of optoelectronic devices, perovskite single-crystal films with long-range orientation need to be stringently controlled. − In this sense, integrated perovskite micro/nano single-crystal microwire arrays with pure crystallographic orientation are necessary to meet the miniaturization and integration of optoelectronic devices . However, the current integration technology faces issues such as poor crystal quality, complicated processing, and small arrayed areas.…”