Jump to main content
Jump to site search

Issue 22, 2019
Previous Article Next Article

Atomic structural catalogue of defects and vertical stacking in 2H/3R mixed polytype multilayer WS2 pyramids

Author affiliations

Abstract

We examine the atomic structure of chemical vapour deposition grown multilayer WS2 pyramids using aberration corrected annular dark field scanning transmission electron microscopy coupled with an in situ heating holder. The stacking orders and specific types of defects after partial degradation by S and W atomic loss at high temperature are resolved layer-by-layer. Our study of an individual WS2 pyramid with at least six layers, reveals a mixed 2H and 3R polytype stacking. Etching occurred both top and bottom of the WS2 pyramid, which aids in determining the exact vertical layer stacking configurations in the thicker regions. We provide an extensive catalogue of the contrast profiles associated with defects in WS2 as a function of layer number and stacking type, as imaged using ADF-STEM. These results provide extensive details about the identification of a wide range of defects in S2 layers, and the unique ADF-STEM contrast patterns that arise from complex multilayer stacking.

Graphical abstract: Atomic structural catalogue of defects and vertical stacking in 2H/3R mixed polytype multilayer WS2 pyramids

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Feb 2019, accepted on 17 May 2019 and first published on 28 May 2019


Article type: Paper
DOI: 10.1039/C9NR01783F
Nanoscale, 2019,11, 10859-10871

  •   Request permissions

    Atomic structural catalogue of defects and vertical stacking in 2H/3R mixed polytype multilayer WS2 pyramids

    G. H. Ryu, J. Chen, Y. Wen, S. Zhou, R. Chang and J. H. Warner, Nanoscale, 2019, 11, 10859
    DOI: 10.1039/C9NR01783F

Search articles by author

Spotlight

Advertisements