Two-Dimensional Materials and Their Electronic Properties

Summary

Two-dimensional (2D) materials are crystalline sheets a few atoms thick whose electrons are confined to motion within a plane, giving rise to properties distinct from their bulk counterparts. Graphene, a single layer of carbon atoms, pioneered the field through its exceptional carrier mobility and Dirac-cone band structure. Beyond graphene, transition-metal dichalcogenides (TMDCs) such as MoS₂ and WS₂ offer intrinsic bandgaps, enabling the design of transistors, photodetectors and light-emitting devices. Other emerging systems include phosphorene, with its anisotropic conductance and tunable bandgap; 2D oxides, prized for chemical stability and wide gaps; and layered magnetic crystals that exhibit long-range order at atomic thickness. The weak van der Waals forces that bind these layers facilitate assembly of heterostructures with tailored band alignments, permitting charge-transfer control, novel topological phases and enhanced optoelectronic response. Research has delivered record-breaking room-temperature mobilities, gate-tunable superconductivity, spin-orbit coupling effects and sizeable nonlinear optical coefficients. These advances herald applications in flexible electronics, energy conversion, quantum information and sensor technologies, underscoring the global significance of 2D materials in next-generation devices.

Research from Nature Portfolio

Recent studies have demonstrated that selective surface functionalisation of monolayer tin monoxide (SnO) by adsorption of light elements such as boron, carbon, nitrogen and fluorine can engineer both the electronic bandgap and local magnetic moments. This work reveals that adatom binding energies can be tuned to introduce mid-gap states, modulate carrier concentration and stabilise spin polarisation, thus opening routes to integrate semiconducting and magnetic functionalities within a single 2D sheet. The findings suggest that controlled defect chemistry may provide an effective strategy for spintronic device architectures and for achieving p–n junctions in air-stable oxide monolayers without compromising structural integrity.

Two-Dimensional Materials and Their Electronic Properties publication trend

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

Technical terms

Bandgap: Energy difference between valence and conduction bands that determines a material’s semiconducting behaviour.

Ferromagnetism: Magnetic ordering in which atomic spins align parallel, yielding a net magnetic moment.

Work function: Minimum energy required to remove an electron from a solid to the vacuum level, critical for charge-injection devices.

Van der Waals heterostructure: Stacked assembly of different 2D layers held together by weak van der Waals forces, enabling bespoke electronic interfaces.

Carrier mobility: Measure of how quickly charge carriers (electrons or holes) can traverse a material under an electric field.

References

  1. Tailoring the electronic and magnetic properties of monolayer SnO by B, C, N, O and F adatoms. Scientific Reports (2017).
  2. Hole-doping induced ferromagnetism in 2D materials. npj Computational Materials (2022).
  3. Two-Dimensional Crystals as a Buffer Layer for High Work Function Applications: The Case of Monolayer MoO3. ACS Applied Materials & Interfaces (2022).
  4. 2D Oxides for Electronics and Optoelectronics. Small Science (2022).
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