Superior Dielectric Screening in Two-Dimensional MoS2 Spirals

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

3 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)37941-37946
Journal / PublicationACS Applied Materials and Interfaces
Volume9
Issue number43
Online published2 Oct 2017
Publication statusPublished - 1 Nov 2017

Abstract

Metals have the best dielectric screening capability among all materials; however, it is usually difficult to fabricate continuous and uniform ultrathin (few-atomic-layer thickness) metal films. Conversely, high-quality atomic-thick semiconductor or semimetal materials (so called two-dimensional materials) such as graphene or MoS2 can be readily obtained and robust in ambient conditions; however, their dielectric screening capabilities are greatly reduced by their reduced dimensionality. Particularly, in the vertical direction, the dielectric screening of two-dimensional materials is insufficient; thus, the performances of devices by two-dimensional materials were easily affected by the coulomb-scattering or other kind of sources. Herein, we propose that with a screw dislocation connecting the van der Waals layers in two-dimensional MoS2 spiral structures, excellent dielectric screening in the vertical direction can be achieved. Our Kelvin force microscopy directly demonstrates that the external impurity charges can be perfectly screened by a theoretically minimum number of layers (two layers) in the MoS2 spirals. This spiral structure-assisted screening approach paves new way to the design of high-performance ultrathin electrical and optical devices.

Research Area(s)

  • Kelvin force microscopy, molybdenum disulfide, screening, spiral, thickness dependence

Citation Format(s)

Superior Dielectric Screening in Two-Dimensional MoS2 Spirals. / Ly, Thuc Hue; Kim, Hyun; Thi, Quoc Huy; Lau, Shu Ping; Zhao, Jiong.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 43, 01.11.2017, p. 37941-37946.

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