Engineering light outcoupling in 2D materials

Der-Hsien Lien, Jeongseuk Kang, Matin Amani, Kevin Chen, Mahmut Tosun, Hsinping Wang, Tania Roy, Michael S. Eggleston, Ming C. Wu, Madan Dubey, Sichen Lee, Jr-Hau He, Ali Javey

Research output: Contribution to journalArticlepeer-review

119 Scopus citations


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 ∼11 times increase in Raman signal and a ∼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 (US)
Pages (from-to)1356-1361
Number of pages6
JournalNano Letters
Issue number2
StatePublished - Jan 26 2015

ASJC Scopus subject areas

  • Bioengineering
  • Materials Science(all)
  • Chemistry(all)
  • Mechanical Engineering
  • Condensed Matter Physics


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