Healing of Planar Defects in 2D Materials via Grain Boundary Sliding

Advanced Materials
Xiaoxu ZhaoKian Ping Loh

Abstract

Understanding the mechanisms and kinetics of defect annihilations, particularly at the atomic scale, is important for the preparation of high-quality crystals for realizing the full potential of 2D transition metal dichalcogenides (TMDCs) in electronics and quantum photonics. Herein, by performing in situ annealing experiments in an atomic resolution scanning transmission electron microscope, it is found that stacking faults and rotational disorders in multilayered 2D crystals can be healed by grain boundary (GB) sliding, which works like a "wiper blade" to correct all metastable phases into thermodynamically stable phases along its trace. The driving force for GB sliding is the gain in interlayer binding energy as the more stable phase grows at the expanse of the metastable ones. Density functional theory calculations show that the correction of 2D stacking faults is triggered by the ejection of Mo atoms in mirror twin boundaries, followed by the collective migrations of 1D GB. The study highlights the role of the often-neglected interlayer interactions for defect repair in 2D materials and shows that exploiting these interactions has significant potential for obtaining large-scale defect-free 2D films.

References

Dec 15, 1994·Physical Review. B, Condensed Matter·P E Blöchl
Jan 1, 1993·Physical Review. B, Condensed Matter·G Kresse, J Hafner
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Jul 13, 2004·Physical Review Letters·M DionB I Lundqvist
May 5, 2012·Nano Letters·Simon KuraschUte Kaiser
Jul 17, 2012·Science·Jamie H WarnerAngus I Kirkland
May 7, 2013·Nature Materials·Arend M van der ZandeJames C Hone
May 11, 2013·Nano Letters·Wu ZhouJuan-Carlos Idrobo
Jun 19, 2013·Nano Letters·Junhao LinSokrates T Pantelides
Sep 19, 2014·Nature Communications·Kaihui LiuFeng Wang
Feb 20, 2015·Nature Communications·Jinhua HongZe Zhang
Jan 24, 2017·Advanced Materials·Sock Mui PohKian Ping Loh
May 13, 2017·Nature Communications·Bethany M HudakBeth S Guiton
Jun 22, 2017·Journal of the American Chemical Society·Deyi FuKian Ping Loh
Dec 19, 2017·Nano Letters·Xiaoxu ZhaoKian Ping Loh
Aug 31, 2018·Advanced Materials·Xiaoxu ZhaoKian Ping Loh

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