Enhancement of van der Waals Interlayer Coupling through Polar Janus MoSSe

Kunyan Zhang, Yunfan Guo, Qingqing Ji, Ang Yu Lu, Cong Su, Hua Wang, Alexander A. Puretzky, David B. Geohegan, Xiaofeng Qian, Shiang Fang, Efthimios Kaxiras, Jing Kong, Shengxi Huang

Research output: Contribution to journalArticlepeer-review

Abstract

Interlayer coupling plays essential roles in the quantum transport, polaritonic, and electrochemical properties of stacked van der Waals (vdW) materials. In this work, we report the unconventional interlayer coupling in vdW heterostructures (HSs) by utilizing an emerging 2D material, Janus transition metal dichalcogenides (TMDs). In contrast to conventional TMDs, monolayer Janus TMDs have two different chalcogen layers sandwiching the transition metal and thus exhibit broken mirror symmetry and an intrinsic vertical dipole moment. Such a broken symmetry is found to strongly enhance the vdW interlayer coupling by as much as 13.2% when forming MoSSe/MoS2 HS as compared to the pristine MoS2 counterparts. Our noncontact ultralow-frequency Raman probe, linear chain model, and density functional theory calculations confirm the enhancement and reveal the origins as charge redistribution in Janus MoSSe and reduced interlayer distance. Our results uncover the potential of tuning interlayer coupling strength through Janus heterostacking.

Original languageEnglish (US)
Pages (from-to)17499-17507
Number of pages9
JournalJournal of the American Chemical Society
Volume142
Issue number41
DOIs
StatePublished - Oct 14 2020

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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