Antiphase Boundaries as Faceted Metallic Wires in 2D Transition Metal Dichalcogenides

Jung Hwa Kim, Se Yang Kim, Sung O. Park, Gwan Yeong Jung, Seunguk Song, Ahrum Sohn, Sang Woo Kim, Sang Kyu Kwak, Soon Yong Kwon, Zonghoon Lee

Research output: Contribution to journalArticlepeer-review


Antiphase boundaries (APBs) in 2D transition metal dichalcogenides have attracted wide interest as 1D metallic wires embedded in a semiconducting matrix, which could be exploited in fully 2D-integrated circuits. Here, the anisotropic morphologies of APBs (i.e., linear and saw-toothed APBs) in the nanoscale are investigated. The experimental and computational results show that despite their anisotropic nanoscale morphologies, all APBs adopt a predominantly chalcogen-oriented dense structure to maintain the energetically most stable atomic configuration. Moreover, the effect of the nanoscale morphology of an APB on electron transport from two-probe field effect transistor measurements is investigated. A saw-toothed APB has a considerably lower electron mobility than a linear APB, indicating that kinks between facets are the main factors of scattering. The observations contribute to the systematical understanding of the faceted APBs and its impact on electrical transport behavior and it could potentially extend the applications of 2D materials through defect engineering to achieve the desired properties.

Original languageEnglish
Article number2000788
JournalAdvanced Science
Issue number15
Publication statusPublished - 2020 Aug 1

Bibliographical note

Funding Information:
J.H.K., S.‐Y.K., and S.OP. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2018R1A2A2A05019598, No. 2014R1A5A1009799, No. 2017R1E1A1A01075283) and IBS‐R019‐D1.

Publisher Copyright:
© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Engineering(all)
  • Physics and Astronomy(all)


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