Effects of contact material on complex excitonic behaviour of monolayer MoS2

Youngsin Park, Soo Ho Choi, Geunsik Lee, Woochul Yang, Hyunsik Im

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We investigated the optical behaviour of excitons in monolayer MoS2 prepared on a 60 nm-thick metal (Au) ring structure patterned on SiO2. CVD-grown monolayer MoS2 was transferred to the metal structure and placed in contact with three different environments simultaneously: SiO2, Au metal and air. The optical properties of the transferred MoS2 on the substrates were characterized through micro-photoluminescence (μ-PL) measurements. PL peaks were observed near ∼1.82 eV for defect-related emission, ∼1.92 eV for an A exciton, which includes a neutral exciton and a trion, and ∼2.1 eV for a B exciton. The optical band gap and exciton-phonon interaction of the samples on the three substrates were investigated by measuring the temperature-dependent photoluminescence.

Original languageEnglish
Pages (from-to)870-873
Number of pages4
JournalOptical Materials
Volume84
DOIs
StatePublished - Oct 2018

Keywords

  • Exciton
  • MoS
  • Photoluminescence
  • Trion

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