Broadband and Tunable Light Harvesting in Nanorippled MoS₂ Ultrathin Films

Abstract

Nanofabrication of flat optic silica gratings conformally layered with two-dimensional (2D) MoS 2 is demonstrated over large area (cm 2 ), achieving a strong amplification of the photon absorption in the active 2D layer. The anisotropic subwavelength silica gratings induce a highly ordered periodic modulation of the MoS 2 layer, promoting the excitation of Guided Mode Anomalies (GMA) at the interfaces of the 2D layer. We show the capability to achieve a broadband tuning of these lattice modes from the visible (VIS) to the near-infrared (NIR) by simply tailoring the illumination conditions and/or the period of the lattice. Remarkably, we demonstrate the possibility to strongly confine resonant and nonresonant light into the 2D MoS 2 layers via GMA excitation, leading to a strong absorption enhancement as high as 240% relative to a flat continuous MoS 2 film. Due to their broadband and tunable photon harvesting capabilities, these large area 2D MoS 2 metastructures represent an ideal scalable platform for new generation devices in nanophotonics, photo- detection and -conversion, and quantum technologies.

Temperature induced modulation of resonant Raman scattering in bilayer 2H-MoS2

“…Two-dimensional (2D) semiconducting transition metal dichalcogenides (S-TMDs) have attracted significant attention in the last decade due to the thickness dependent electronic band structure that allows for at-will manipulation of optical and opto-electronic properties. 1 – 5 Novel configurations employing monolayers and van der Waals (vdW) heterostructures 6 – 8 have emerged as promising platforms for the development of cutting-edge technology spanning across a broad spectrum that include but is not limited to quantum information processing 9 , 10 spintronics 11 , 12 , nanophotonics 13 – 15 and twistronics. 16 , 17 From the perspective to study lattice dynamics, non-invasive Raman scattering (RS) spectroscopy has emerged as a pivotal tool to uncover the physics of vibrational and electronic properties of 2D S-TMDs.…”

Smart Textiles Based on MoS2 Hollow Nanospheres for Personal Thermal Management

“…Notably, the UV–vis–NIR absorption spectrum (Figure a) suggests that the MoS 2 –HNSPs show a strong optical absorbance in the range of 650–900 nm with a high absorbance of 0.89 at 808 nm, which is due to its multilayer structure and special electronic band structure . The as-prepared MoS 2 –HNSPs demonstrated a desired dispersibility in water, ethanol, and polyethylene glycol (PEG) (inset of Figure a).…”

Engineering van der Waals Materials for Advanced Metaphotonics

“…TMDCs are generally regarded as excellent candidates for light harvesting, due to highly efficient light absorption with a direct band gap and strong light−matter interactions. 1189,1190 Although the excellent capability of solar harvesting has been extensively investigated and TMDC based solar cells have shown excellent conversion efficiency by theoretically modeling, practical solar cells based on a TMDC active layer have rarely been reported. 1191−1195 1196 Significantly improved conversion efficiency was obtained from 9.24% to 17.51% with J sc of 22.19 mA/cm 2 and V oc of 0.8 V. 1196 One of the most promising applications for graphene is use for electrodes ing solar cells and batteries.…”