University of Oulu

Pathirage, V., Lasek, K., Krasheninnikov, A. V., Komsa, H. P., & Batzill, M. (2023). Mirror twin boundaries in WSe2 induced by vanadium doping. Materials Today Nano, 22, 100314.

Mirror twin boundaries in WSe₂ induced by vanadium doping

Saved in:
Author: Pathirage, V.1; Lasek, K.1; Krasheninnikov, A.V.2,3;
Organizations: 1Department of Physics, University of South Florida, Tampa, FL, 33620, USA
2Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany
3Department of Applied Physics, Aalto University, P.O. Box 11100, 00076, Aalto, Finland
4Microelectronics Research Unit, University of Oulu, P.O. Box 8000, Oulu, 90014, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2023
Publish Date: 2025-01-24


Mirror twin boundaries (MTBs) observed in MoSe₂ are formed due to incorporation of excess Mo into the lattice. In contrast, MTBs in WSe₂ have a high formation energy and consequently are not present in this system. Here we show that V-doping of WSe₂, achieved by co-deposition of V and W during molecular beam epitaxy (MBE) growth of WSe₂, can also induce MTB formation in WSe₂, as revealed by scanning tunneling microscopy. Our experimental results are supported by density functional theory calculations that show that V-doped WSe₂ is susceptible to the incorporation of more V-atoms at interstitial sites. This increases the transition metal atom concentration in the lattice, and these excess atoms rearrange into MTBs, which is associated with energy lowering. While formation of MTBs gives rise to the pinning of the Fermi-level and thus prevents V-induced electronic doping, MTBs do not appear to affect the magnetic properties, and a diluted ferromagnetic material is observed for low V-doping levels, as reported previously for V-doped WSe₂.

see all

Series: Materials today nano
ISSN: 2588-8420
ISSN-E: 2588-8420
ISSN-L: 2588-8420
Volume: 22
Article number: 100314
DOI: 10.1016/j.mtnano.2023.100314
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
221 Nanotechnology
Funding: Financial support from the National Science Foundation under award DMR 2118414 is acknowledged. We further acknowledge funding from the German Research Foundation (DFG), project KR 4866/6–1, and through the collaborative research centre “Chemistry of Synthetic 2D Materials” SFB-1415- 417590517.
Copyright information: © 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license