Heterostructure Fabrication and Characterization in Two-Dimensional Materials

Two-dimensional (2D) materials such as graphene and transition metal dichalcogenides (TMDs) have ushered in a new era of ultrathin electronics and optoelectronics. By stacking dissimilar monolayers or forging in-plane junctions between them, researchers create heterostructures that combine distinct electronic, optical and mechanical properties. Vertical assemblies rely on weak van der Waals forces to bind individual sheets without lattice matching, enabling atomically sharp interfaces free of dangling bonds. In-plane or lateral heterostructures, by contrast, require precise control over local composition and phase during growth, often achieved by selective precursor delivery or patterned conversion. Fabrication strategies range from mechanical transfer of exfoliated flakes, chemical vapour deposition (CVD) of sequential layers, pulsed laser deposition, to lithography-assisted conversion. Characterization of these ultrathin heterointerfaces employs spectroscopic and microscopic tools: Raman and photoluminescence mapping reveal chemical identity and band alignment, while transmission electron microscopy and scanning probe methods assess atomic registry, interface sharpness and local electronic potential. Together, these advances underpin prototypes of ultrafast transistors, light-emitting diodes, photodetectors and catalytic surfaces for energy conversion, highlighting the global significance of 2D heterostructures for next-generation technologies.

Research from Nature Portfolio

Recent studies have demonstrated strain-driven synthesis of micrometre-long nano-channels within monolayer crystals. By exploiting intrinsic grain boundary strain fields, one material can substitute atoms of its neighbour, yielding coherent MoS₂ channels embedded in a MoSe₂ host with widths of just a few nanometres. These ultralong channels not only exemplify precise spatial control but also exhibit enhanced catalytic activity for hydrogen evolution at their strained interfaces. Another approach employs selective chemical doping to form large-area lateral junctions in TMD thin films. A single deposition of benzyl viologen molecules n-dopes regions of MoS₂ and MoSe₂, reducing resistance by orders of magnitude. Patterned doping produces centimetre-scale heterojunction arrays whose rectifying behaviour confirms reliable band offsets, pointing to scalable routes for electronics integration without complex transfer steps.

Heterostructure Fabrication and Characterization in Two-Dimensional Materials publication trend

The graph below shows the total number of articles in heterostructure fabrication and characterization in two-dimensional materials across all publications each year (not limited to Nature Index journals).

Technical terms

Van der Waals heterostructure: Stacked layers of 2D materials bound by weak interlayer forces, preserving individual lattice structures.

Lateral heterojunction: In-plane interface between two distinct 2D semiconductors formed during growth or conversion.

Chemical vapour deposition (CVD): A process in which volatile precursors react on a substrate to form thin crystalline films.

Raman spectroscopy: A vibrational analysis technique that identifies material composition and strain via inelastic light scattering.

Photoluminescence spectroscopy: An optical method probing electronic band structure and interface quality through emitted light upon excitation.

Scanning transmission electron microscopy (STEM): A high-resolution imaging technique that maps atomic arrangements and interface sharpness.

References

1. Review Article: Progress in fabrication of transition metal dichalcogenides heterostructure systems. Journal of Vacuum Science & Technology B Nanotechnology and Microelectronics Materials Processing Measurement and Phenomena (2017).
2. Direct In Situ Growth of Centimeter‐Scale Multi‐Heterojunction MoS2/WS2/WSe2 Thin‐Film Catalyst for Photo‐Electrochemical Hydrogen Evolution. Advanced Science (2019).
3. Large area, patterned growth of 2D MoS2 and lateral MoS2WS2 heterostructures for nano- and opto-electronic applications. Nanotechnology (2020).
4. The Photodetectors Based on Lateral Monolayer MoS2/WS2 Heterojunctions. Discover Nano (2021).
5. Strain-driven growth of ultra-long two-dimensional nano-channels. Nature Communications (2020).
6. Scalable lateral heterojunction by chemical doping of 2D TMD thin films. Scientific Reports (2020).