3 years ago

Superior Dielectric Screening in Two-Dimensional MoS2 Spirals

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

Publisher URL: http://dx.doi.org/10.1021/acsami.7b11468

DOI: 10.1021/acsami.7b11468

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