Ripples, strain, and misfit dislocations: Structure of graphene-boron nitride superlattice interfaces

Dinkar Nandwana, Elif Ertekin

Research output: Contribution to journalArticlepeer-review

Abstract

In recently synthesized two-dimensional superlattices of graphene and boron nitride, the atomic structure of the interface is complicated by a 2% lattice mismatch between the two materials. Using atomistic and continuum analysis, we show that the mismatch results in a competition between two strain-relieving mechanisms: misfit dislocations and rippling. For flat superlattices, beyond a critical pitch the interface is decorated by strain-relieving misfit dislocations. For superlattices that can deform out-of-plane, optimal ripple wavelengths emerge.

Original languageEnglish (US)
Pages (from-to)1468-1475
Number of pages8
JournalNano letters
Volume15
Issue number3
DOIs
StatePublished - Mar 11 2015

Keywords

  • Graphene
  • heteroepitaxy
  • hexagonal boron nitride
  • interface structure
  • lattice relaxation
  • misfit dislocations

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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