Charge dynamics and electronic structures of monolayer MoS2 films grown by chemical vapor deposition

Chih Chiang Shen, Yu Te Hsu, Lain Jong Li, Hsiang Lin Liu

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

THz absorption and spectroscopic ellipsometry were used to investigate the charge dynamics and electronic structures of chemical-vapordeposited monolayer MoS2 films. THz conductivity displays a coherent response of itinerant charge carriers at zero frequency. Drude plasma frequency (∼7 THz) decreases with decreasing temperature while carrier relaxation time (∼26 fs) is almost temperature independent. The absorption spectrum of monolayer MoS2 shows a direct 1.95 eV band gap and charge transfer excitations that are ∼0:2 eV higher than those of the bulk counterpart. The ground-state exciton binding energy is found to be about 0.48 eV.

Original languageEnglish (US)
Article number125801
JournalAPPLIED PHYSICS EXPRESS
Volume6
Issue number12
DOIs
StatePublished - Dec 2013
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy

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