Excitonic quantum confinement modified optical conductivity of monolayer and few-layered MoS2

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

25 Scopus Citations
View graph of relations

Author(s)

  • Guang Yi Jia
  • Yue Liu
  • Jing Yu Gong
  • Dan Li Wang
  • Zhen Xian Huang

Detail(s)

Original languageEnglish
Pages (from-to)8822-8828
Journal / PublicationJournal of Materials Chemistry C
Volume4
Issue number37
Online published26 Aug 2016
Publication statusPublished - 7 Oct 2016
Externally publishedYes

Abstract

Optical conductivity plays an important role in characterizing the optoelectronic properties of two-dimensional materials. Here we derive the complex optical conductivities for monolayer and few-layered MoS2 films from their reflectance and transmittance responses. We show that the excitonic quantum confinement effect significantly modifies both the peak energy and magnitude of their optical conductivity, manifested by a gradual blueshift in energy (consistent with two well-known models for quantum well systems) and exponential attenuation in magnitude with decreasing layer number. More importantly, the C excition induced optical conductivity peak exhibits the strongest dependence on the MoS2 layer number because of its largest Bohr radius among the A, B and C excitons. This unambiguously confirms the strong influence of quantum confinement effect in the optical conductivity of MoS2, shedding important insights into understanding its rich exciton-related optical properties and therefore facilitating potential applications in optoelectronic devices.

Citation Format(s)

Excitonic quantum confinement modified optical conductivity of monolayer and few-layered MoS2. / Jia, Guang Yi; Liu, Yue; Gong, Jing Yu; Lei, Dang Yuan; Wang, Dan Li; Huang, Zhen Xian.

In: Journal of Materials Chemistry C, Vol. 4, No. 37, 07.10.2016, p. 8822-8828.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal