Lensless Polarimetric Imaging and Encryption Enabled by Te/ReSe van der Waals Heterostructure Polarization-Sensitive Photodetector.

Polarimetric imaging and encryption improve target recognition precision and information security, enhancing image sensors' perceptual acuity and interference resilience. However, the miniaturization of sensing systems faces challenges due to the complex integration of dispersive optical components such as polarizers. To address this, we propose a polarization-sensitive photodetector using a Te/ReSe van der Waals heterostructure.

An Ultrasensitive BiOSe/InS Photodetector with Low Detection Limit and Fast Response toward High-Precision Unmanned Driving.

The machine vision utilized in unmanned driving systems must possess the ability to accurately perceive scenes under low-light illumination conditions. To achieve this, photodetectors with low detection limits and a fast response are essential. Current systems rely on avalanche diodes or lidars, which come with the drawbacks of increased energy consumption and complexity.

Sandwiched WS/MoTe/WS Heterostructure with a Completely Depleted Interlayer for a Photodetector with Outstanding Detectivity.

Photodetectors based on two-dimensional van der Waals (2D vdW) heterostructures with high detectivity and rapid response have emerged as promising candidates for next-generation imaging applications. However, the practical application of currently studied 2D vdW heterostructures faces challenges related to insufficient light absorption and inadequate separation of photocarriers. To address these challenges, we present a sandwiched WS/MoTe/WS heterostructure with a completely depleted interlayer, integrated on a mirror electrode, for a highly efficient photodetector.

Prediction of the hardest BiFeO from first-principles calculations.

BiFeO is the only material with ferroelectric Curie temperature and Néel temperature higher than room temperature, making it one of the most well-studied multiferroic materials. Based on an evolutionary algorithm, we predicted a new cubic C-type antiferromagnetic structure (3̄-BiFeO) at ambient pressure. It was found that 3̄-BiFeO is the hardest BiFeO (Vickers hardness ∼ 9.

Synthesis of Active Hexafluoroisopropyl Benzoates via a Multicomponent Reaction.

Herein, we describe an efficient, practical free-metal rapid access to active hexafluoroisopropyl benzoates from anthranils, hexafluoroisopropanol, and -alkoxy α-halogenoacetamides. Notably, this process includes anthranils that underwent a distinct pattern reaction. The protocol has good functional group tolerance and a broad substrate scope.