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Related Experiment Video

Updated: Jan 28, 2026

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Published on: July 18, 2025

Interface-Driven Partial Dislocation Formation in 2D Heterostructures.

Jung Hwa Kim¹, Se-Yang Kim¹, Yeonchoo Cho²

¹School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)

|February 21, 2019

Summary

Wrinkled graphene substrates create stacking boundaries in tungsten disulfide (WS₂) layers during van der Waals epitaxy. This defect engineering modifies WS₂ electronic properties by controlling strain and interlayer interactions.

Keywords:

WS2/graphene heterostructure buckling graphene wrinkle strain relaxation topological defect

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Van der Waals (vdW) epitaxy enables heterostructure fabrication by minimizing lattice-matching constraints.
Substrate morphology can significantly influence thin-film growth and properties in vdW epitaxy.

Purpose of the Study:

To investigate interface-driven stacking boundaries in tungsten disulfide (WS₂) grown on wrinkled graphene.
To understand how substrate topography affects WS₂ epilayer growth, strain, and electronic properties.

Main Methods:

Epitaxial growth of WS₂ on wrinkled graphene substrates.
Analysis of WS₂ epilayers to identify nucleation sites, growth impediments, and strain relaxation mechanisms.

Main Results:

Graphene wrinkles act as nucleation sites but hinder lateral growth and induce anisotropic friction.
Partial dislocations drive in-plane strain relaxation via out-of-plane buckling.
Strain relaxation at dislocations restores the monolayer WS₂ bandgap by reducing interlayer interactions.

Conclusions:

Substrate morphology profoundly impacts vdW epitaxy, even with relaxed lattice constraints.
Interface-driven defects and strain engineering offer pathways to tailor WS₂ optical and electronic properties.