Near-perfect spectrally-selective metasurface solar absorber based on tungsten octagonal prism array

Xu, Mingpan; Guo, Lin; Zhang, Pengfei; Qiu, Yu; Li, Qing; Wang, Jikang

doi:10.1039/d2ra02802f

Cited by 5 publications

(1 citation statement)

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“…[31] However, achieving polarization independent broadband absorption in purely plasmonic absorbers requires intricate geometries that make design and fabrication challenging. Using lossy plasmonic metals such as chromium, titanium nitride, and tungsten has been shown to improve broadband absorption, [32][33][34][35][36][37][38][39] but the inability to generate photocurrents in a metal limits potential applications.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Broadband Metasurface Superabsorbers from a van der Waals Semimetal

Alfieri

Motala

Snure

et al. 2022

Advanced Optical Materials

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Metamaterials and metasurfaces operating in the visible and near‐infrared (NIR) offer a promising route towards next‐generation photodetectors and devices for solar energy harvesting. While numerous metamaterials and metasurfaces using metals and semiconductors have been demonstrated, semimetals‐based metasurfaces in the vis‐NIR range are notably missing. This work experimentally demonstrates a broadband metasurface superabsorber based on large area, semimetallic, van der Waals platinum diselenide (PtSe2) thin films in agreement with electromagnetic simulations. The results show that PtSe2 is an ultrathin and scalable semimetal that concurrently possesses high index and high extinction across the vis‐NIR range. Consequently, the thin‐film PtSe2 on a reflector separated by a dielectric spacer can absorb >85% for the unpatterned case and ≈97% for the optimized 2D metasurface in the 400–900 nm range making it one of the strongest and thinnest broadband perfect absorbers to date. The results present a scalable approach to photodetection and solar energy harvesting, demonstrating the practical utility of high index, high extinction semimetals for nanoscale optics.

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