Optoelectronic and Electronic Properties of Two-Dimensional Materials

Two-dimensional materials encompass a broad class of atomically thin crystals, from graphene to transition-metal dichalcogenides and group-VA allotropes, whose layers exhibit unique optoelectronic and electronic phenomena. Quantum confinement in the vertical direction endows these materials with tunable bandgaps, enabling strong light–matter interactions and efficient exciton formation. High in-plane carrier mobilities and flexibility combine with optical transparency to support applications in flexible electronics, photodetectors, light-emitting devices and transparent electrodes. The van der Waals nature of interlayer bonding allows the creation of bespoke heterostructures and modulation of charge-carrier type via chemical or electrostatic doping. Layer-dependent changes in dielectric response, crystal symmetry and defect states further permit tailored charge transport, anisotropic conduction and variable photoresponse across ultraviolet, visible and infrared wavelengths. Together, these attributes position two-dimensional materials at the frontier of nanoscale optoelectronics and future generations of ultrathin, energy-efficient devices.

Research from Nature Portfolio

Recent studies have demonstrated the epitaxial growth of high-quality antimonene single crystals, revealing remarkable ambient stability, electrical conductivity up to 10^4 S m^–1 and optical transparency in the visible range, thus opening prospects for transparent conductive electrodes. Investigations of atomically thin PtSe₂ have shown a variable mid-infrared bandgap through layer-number and defect engineering, yielding broadband photoconductive detectors operating across 2–5 µm wavelengths. Further work on thickness-modulated PtSe₂ has uncovered a complete metal-to-semiconductor transition below a few nanometres, with ambipolar transport and on/off ratios of ~10^5, highlighting its utility for ultrathin logic and optoelectronic components.

Optoelectronic and Electronic Properties of Two-Dimensional Materials publication trend

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

Technical terms

Two-dimensional material: An atomically thin crystal with strong in-plane bonds and weak interlayer van der Waals interactions.

Bandgap: Energy difference between valence and conduction bands that determines semiconducting behaviour.

Exciton: A bound state of an electron and a hole formed by optical excitation across the bandgap.

Van der Waals epitaxy: Growth of crystalline films held together by van der Waals forces, allowing high-quality 2D layers on diverse substrates.

Heterojunction: Interface of two dissimilar materials engineered to control charge-carrier flow and optical absorption.

Quantum dot: Nanoscale semiconductor particle confining carriers in all three dimensions, yielding discrete energy states.

Photoconductivity: Increase in electrical conductivity of a material under illumination due to generation of charge carriers.

References

1. Two-dimensional antimonene single crystals grown by van der Waals epitaxy. Nature Communications (2016).
2. Atomically thin noble metal dichalcogenide: a broadband mid-infrared semiconductor. Nature Communications (2018).
3. Thickness-modulated metal-to-semiconductor transformation in a transition metal dichalcogenide. Nature Communications (2018).
4. Lead halide perovskite sensitized WSe2 photodiodes with ultrahigh open circuit voltages. eLight (2023).
5. Highly enhanced UV absorption and light emission of monolayer WS2 through hybridization with Ti2N MXene quantum dots and g-C3N4 quantum dots. Opto-Electronic Advances (2024).