Work

Ultrasensitive Circularly Polarized Photon Detectors Based on Chiral Two-Dimensional MoS 2

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Engineering chiral optical and electronic properties of materials is interesting for applications in sensing and quantum information. State-of-the-art chiral optoelectronic devices are mostly based on three-dimensional (3D) and quasi-two-dimensional (2D) materials. Here we demonstrate chiral 2D MoS 2 with sub-nanometer thickness via chirality transfer from l -/ d -penicillamine ( l -/ d -PEN). We report a giant molar ellipticity of 10 8 deg·cm 2 /dmol in monolayer solid-state films, up to 3 orders of magnitude higher than 3D chiral materials. Phototransistors with chiral 2D MoS 2 channels exhibit gate-tunable circularly polarized light detection with responsivity of >10 2 A/W and anisotropy g -factor of 1.98, close to the theoretical maximum of 2.0. The reduced dimensionality magnifies the chirality transfer efficiency, allowing realization of ultrasensitive detectors for circularly polarized photons.

Source: ACS Nano

DOI: 10.1021/acsnano.5c12182