Ultrasensitive Circularly Polarized Photon Detectors Based on Chiral Two-Dimensional MoS<sub>2</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41128752.
- Also identified by DOI 10.1021/acsnano.5c12182 and PMC identifier 12593354.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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<sub>2</sub> with sub-nanometer thickness via chirality transfer from l-/d-penicillamine (l-/d-PEN). We report a giant molar ellipticity of 10<sup>8</sup> deg·cm<sup>2</sup>/dmol in monolayer solid-state films, up to 3 orders of magnitude higher than 3D chiral materials. Phototransistors with chiral 2D MoS<sub>2</sub> channels exhibit gate-tunable circularly polarized light detection with responsivity of >10<sup>2</sup> A/W and anisotropy <i>g</i>-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.