Monolayer Semiconductor Superlattices with High Optical Absorption.

ABSTRACT: Optical absorption plays a central role in optoelectronic and photonic technologies. Strongly absorbing materials are thus needed for efficient and miniaturized devices. A uniform film much thinner than the wavelength can only absorb up to 50% of the incident light when embedded in a symmetric and homogeneous environment. Although deviating from these conditions allows higher absorption, finding the thinnest possible material with the highest intrinsic absorption is still desirable. Here, we demonstrate strong absorption by artificially stacking WS₂ monolayers into superlattices. We compare three simple approaches based on different spacer materials to surpass the peak absorptance of a single WS₂ monolayer, which stands at 16% on ideal substrates. Through direct monol

SUBMITTER: Elrafei SA 

PROVIDER: S-EPMC11258785 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature