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Title: How the Complementarity at Vicinal Steps Enables Growth of 2D Monocrystals

Abstract

Large 2D monocrystals are highly sought after yet hard to achieve; unlike graphene, most dichalcogenides and h-BN possess low symmetry, which allows for nucleation of mutually inverted pieces, merging into polycrystals replete with grain boundaries. On vicinal substrate surfaces such growing pieces were observed to orient alike, and very recently this effect apparently enabled the growth of large single crystal h-BN. Addressing the compelling questions of how such a growth process can operate and what the key mechanisms are is crucial in guiding the substrate selection for optimal synthesis of perhaps many materials. To this end, the basic crystallography and atomistic-modeling theory presented here reveal (i) how the undulations of the ever-wandering steps do not, surprisingly, disturb the orientations of the attached 2D-nuclei, whose direction remains robust owing to complementarity between the meandering step and h-BN counterpart if their kinks have similar size of negligible misfit, δk < 0.1 Å. (ii) Stronger chemical affinity of metal to the N atoms at the zigzag edge of h-BN singles out its particular orientation, without evidence of any epitaxy, at the edge or to the surface. (iii) The monocrystal integrity requires unhindered growth spillover across the steps and the seamless healing of themore » residual fissures, caused by the very same steps necessary for co-orientation. Molecular dynamics simulations show this happening for the steps not taller than the BN bond, s < 1.44 Å. These criteria point to [−1 1 2] steps on the Cu (110) surface, in accord with experimental results (Wang et al. Towards the growth of single-crystal boron nitride monolayer on Cu. arXiv:1811.06688 Cond. Mat. Mtrl. Sci., 2018), while other possibilities can also be predicted.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Department of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1530801
DOE Contract Number:  
SC0012547; AC02- 05CH11231
Resource Type:
Journal Article
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 19; Journal Issue: 3; Journal ID: ISSN 1530-6984
Country of Publication:
United States
Language:
English

Citation Formats

Bets, Ksenia V., Gupta, Nitant, and Yakobson, Boris I. How the Complementarity at Vicinal Steps Enables Growth of 2D Monocrystals. United States: N. p., 2019. Web. doi:10.1021/acs.nanolett.9b00136.
Bets, Ksenia V., Gupta, Nitant, & Yakobson, Boris I. How the Complementarity at Vicinal Steps Enables Growth of 2D Monocrystals. United States. doi:10.1021/acs.nanolett.9b00136.
Bets, Ksenia V., Gupta, Nitant, and Yakobson, Boris I. Mon . "How the Complementarity at Vicinal Steps Enables Growth of 2D Monocrystals". United States. doi:10.1021/acs.nanolett.9b00136.
@article{osti_1530801,
title = {How the Complementarity at Vicinal Steps Enables Growth of 2D Monocrystals},
author = {Bets, Ksenia V. and Gupta, Nitant and Yakobson, Boris I.},
abstractNote = {Large 2D monocrystals are highly sought after yet hard to achieve; unlike graphene, most dichalcogenides and h-BN possess low symmetry, which allows for nucleation of mutually inverted pieces, merging into polycrystals replete with grain boundaries. On vicinal substrate surfaces such growing pieces were observed to orient alike, and very recently this effect apparently enabled the growth of large single crystal h-BN. Addressing the compelling questions of how such a growth process can operate and what the key mechanisms are is crucial in guiding the substrate selection for optimal synthesis of perhaps many materials. To this end, the basic crystallography and atomistic-modeling theory presented here reveal (i) how the undulations of the ever-wandering steps do not, surprisingly, disturb the orientations of the attached 2D-nuclei, whose direction remains robust owing to complementarity between the meandering step and h-BN counterpart if their kinks have similar size of negligible misfit, δk < 0.1 Å. (ii) Stronger chemical affinity of metal to the N atoms at the zigzag edge of h-BN singles out its particular orientation, without evidence of any epitaxy, at the edge or to the surface. (iii) The monocrystal integrity requires unhindered growth spillover across the steps and the seamless healing of the residual fissures, caused by the very same steps necessary for co-orientation. Molecular dynamics simulations show this happening for the steps not taller than the BN bond, s < 1.44 Å. These criteria point to [−1 1 2] steps on the Cu (110) surface, in accord with experimental results (Wang et al. Towards the growth of single-crystal boron nitride monolayer on Cu. arXiv:1811.06688 Cond. Mat. Mtrl. Sci., 2018), while other possibilities can also be predicted.},
doi = {10.1021/acs.nanolett.9b00136},
journal = {Nano Letters},
issn = {1530-6984},
number = 3,
volume = 19,
place = {United States},
year = {2019},
month = {2}
}