Natural Layered Phlogopite Dielectric for Ultrathin Two-Dimensional Optoelectronics.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40776720.
- Also identified by DOI 10.1021/acsnano.5c09046 and PMC identifier 12369019.
- 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
The integration of high-dielectric-constant (high-κ) materials with two-dimensional (2D) semiconductors is promising to overcome performance limitations and reach their full theoretical potential. Here, we show that naturally occurring phlogopite mica, exfoliated into ultrathin flakes, can serve as a robust high-κ dielectric layer for transition metal dichalcogenide-based 2D electronics and optoelectronics. The wide band gap (∼4.8 eV), high dielectric constant (∼11), and large breakdown field (>10 MV cm<sup>-1</sup>) of phlogopite enable transistors with subthreshold swings down to 100 mV dec<sup>-1</sup>, minimal hysteresis (∼30-60 mV), and interface trap densities comparable to those of state-of-the-art oxide dielectrics. Moreover, phototransistors built upon monolayer molybdenum disulfide (MoS<sub>2</sub>) and phlogopite exhibit responsivities up to 3.3 × 10<sup>4</sup> AW<sup>-1</sup> and detectivities close to 10<sup>10</sup> Jones, surpassing devices based on conventional gate insulators. We further demonstrate the versatility of this natural dielectric by integrating phlogopite/MoS<sub>2</sub> heterostructures into NMOS inverters, showcasing robust voltage gains and low-voltage operation. Our findings establish phlogopite as a promising, earth-abundant dielectric for next-generation 2D transistor technologies and high-performance photodetection.