Realization of High‐Performance Self‐Powered Polarized Photodetection with Large Temperature Window in a 2D Polar Perovskite

Abstract

Polarization photodetection taking advantage of the anisotropy of 2D materials shines brilliantly in optoelectronic fields owing to differentiating optical information. However, the previously reported polarization detections are mostly dependent on external power sources, which is not conducive to device integration and energy conservation. Herein, a 2D polar perovskite (CBA)2CsPb2Br7 (CCPB, CBA = 4‐chlorobenzyllamine) has been successfully synthesized, which shows anticipated bulk photovoltaic effect (BPVE) with an open‐circuited photovoltage up to ≈0.2 V. Devices based on CCPB monomorph fulfill a fascinating self‐powered polarized photodetection with a large polarization ratio of 2.7 at room temperature. Moreover, CCPB features a high phase‐transition temperature (≈475 K) which prompts such self‐powered polarized photodetection in a large temperature window of device operation, since BPVE generated by spontaneous polarization can only exist in the polar structure prior to the phase transition. Further computational investigation reveals the introduction of CBA+ with a large dipole moment contributes to quite large polarization (17.5 µC cm−2) and further super high phase transition temperature of CCPB. This study will promote the application of 2D perovskite materials for self‐powered polarized photodetection in high‐temperature conditions.

Manganese-Based Halogen Regulation Enhances Photoluminescence Efficiency Engineering

“…During the past few years, organic–inorganic hybrids have attracted significant interest and become the topic of researchers’ concerns. − The thermodynamic and kinetic properties of these hybrids are contingent on their distinct chemical constituents and molecular arrangement. Consequently, the chemical design of organic–inorganic hybrids emerged as a focal point across diverse research fields. − Additionally, organic–inorganic hybrid halides are equally appealing due to their versatility, ease of synthesis, , structural tunability, , and optoelectronic properties. , They have demonstrated excellent performance in various properties including dielectricity, ferroelectricity, piezoelectricity, photoluminescence, thermochromism, and nonlinear optics. − Despite this, optimizing and enhancing the material performance poses challenges. It is also worth noting that the halogen modulation approach may also be used to explore more organic–inorganic hybrid compounds with remarkable aesthetics. − …”