Probing the interlayer coupling of twisted bilayer MoS2 using photoluminescence spectroscopy

Shengxi Huang, Xi Ling, Liangbo Liang, Jing Kong, Humberto Terrones, Vincent Meunier, Mildred S. Dresselhaus

Research output: Contribution to journalArticlepeer-review

157 Scopus citations

Abstract

Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic devices due to its strong photoluminescence emission. In this work, the photoluminescence of twisted bilayer MoS2 is investigated, revealing a tunability of the interlayer coupling of bilayer MoS2. It is found that the photoluminescence intensity ratio of the trion and exciton reaches its maximum value for the twisted angle 0° or 60°, while for the twisted angle 30° or 90° the situation is the opposite. This is mainly attributed to the change of the trion binding energy. The first-principles density functional theory analysis further confirms the change of the interlayer coupling with the twisted angle, which interprets our experimental results.

Original languageEnglish (US)
Pages (from-to)5500-5508
Number of pages9
JournalNano letters
Volume14
Issue number10
DOIs
StatePublished - Oct 8 2014

All Science Journal Classification (ASJC) codes

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

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