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Related Experiment Videos

Quantifying Plasmon-Enhanced Light Absorption in Monolayer WS2 Films.

Serkan Butun1, Edgar Palacios1, Jeffrey D Cain1

  • 1Department of Electrical Engineering and Computer Science, ‡Department of Materials Science and Engineering, and §International Institute for Nanotechnology (IIN) Northwestern University , Evanston, Illinois 60208, United States.

ACS Applied Materials & Interfaces
|April 11, 2017
PubMed
Summary

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Silver nanodisks boost light absorption in tungsten disulfide (WS₂) monolayers by fourfold. This enhancement in WS₂ films improves optoelectronic device performance, like solar cells and photodetectors.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Transition metal dichalcogenide semiconductors, like tungsten disulfide (WS₂), are promising for optoelectronics due to their unique properties.
  • Improving light absorption in monolayer WS₂ is critical for efficient device applications.

Purpose of the Study:

  • To systematically investigate and quantify the absorption enhancement in WS₂ monolayer films.
  • To explore the use of silver plasmonic nanodisk arrays for enhancing light absorption.

Main Methods:

  • Conducted numerical simulations (full-field electromagnetic) and experimental optical absorption spectroscopy.
  • Fabricated hybrid silver (Ag)/WS₂ heterostructures.

Main Results:

Keywords:
2D materialsTransition-metal dichalcogenidesWS2absorption enhancementplasmonics

Related Experiment Videos

  • Achieved a fourfold enhancement in WS₂ monolayer absorption near its band edge.
  • Observed enhancement correlated with the plasmonic resonance of Ag nanodisk arrays.
  • Calculated a 2.5-fold increase in short-circuit current for the Ag/WS₂ heterostructure.

Conclusions:

  • Hybrid plasmonic/2D material structures significantly enhance light absorption in WS₂ monolayers.
  • This approach facilitates the development of advanced 2D optoelectronic devices, including solar cells and photodetectors.