Engineering Light Outcoupling in 2D Materials

Der-Hsien Lien, Jeong Seuk Kang, Matin Amani, Kevin Chen, Mahmut Tosun, Hsin-Ping Wang, Tania Roy, Michael S. Eggleston, Ming C. Wu, Madan Dubey, Si-Chen Lee, Jr-Hau He*, Ali Javey

*Corresponding author for this work

Research output: Contribution to journalArticle

89 Scopus citations

Abstract

When light is incident on 2D transition metal dichalcogenides (TMDCs), it engages in multiple reflections within underlying substrates, producing interferences that lead to enhancement or attenuation of the incoming and outgoing strength of light. Here, we report a simple method to engineer the light outcoupling in semiconducting TMDCs by modulating their dielectric surroundings. We show that by modulating the thicknesses of underlying substrates and capping layers, the interference caused by substrate can significantly enhance the light absorption and emission of WSe2, resulting in a similar to 11 times increase in Raman signal and a similar to 30 times increase in the photoluminescence (PL) intensity of WSe2. On the basis of the interference model, we also propose a strategy to control the photonic and optoelectronic properties of thin-layer WSe2. This work demonstrates the utilization of outcoupling engineering in 2D materials and offers a new route toward the realization of novel optoelectronic devices, such as 2D LEDs and solar cells.

Original languageEnglish
Pages (from-to)1356-1361
Number of pages6
JournalNano letters
Volume15
Issue number2
DOIs
StatePublished - Feb 2015

Keywords

  • 2D materials
  • light outcoupling
  • substrate interference
  • photoluminescence
  • Raman
  • RAMAN-SPECTROSCOPY
  • GRAPHENE
  • MOS2
  • PHOTOLUMINESCENCE
  • EMISSION
  • ENERGY
  • DIODES
  • LAYERS
  • FILMS

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