Charge Transfer Dynamics in Two-Dimensional Heterostructures

Two-dimensional heterostructures assembled from atomically thin layers of distinct materials offer unparalleled opportunities to study and exploit charge transfer dynamics, the processes by which electrons and holes move across interfaces. By relying on van der Waals forces rather than covalent bonding, these heterostructures overcome lattice-mismatch constraints, permitting seamless integration of semiconductors, insulators and organic networks. Charge transfer dynamics govern key functions such as exciton dissociation, interlayer tunnelling and ultrafast carrier separation, all of which underpin the performance of optoelectronic devices, photovoltaics and quantum platforms. Precise control over interlayer coupling, band alignment and dielectric screening has been demonstrated through strategies ranging from covalent organic frameworks interfaced with transition metal dichalcogenides to hydrogen-bonded superlattices on monolayer semiconductors. Spectroscopic studies reveal that interfacial charge transfer can occur on femtosecond timescales, while substrate-mediated effects may enable selective doping and catalytic enhancement. Such progress not only deepens understanding of fundamental charge transport phenomena but also drives innovation in energy harvesting, high-speed electronics and light-modulated quantum devices.

Research from Nature Portfolio

Recent studies have demonstrated a bottom-up approach for producing large-scale, highly crystalline heterostructures by self-assembling a hydrogen-bonded organic framework onto graphene, yielding a floating bilayer with clean interfaces and coexisting Dirac and narrow molecular bands. This work illustrates how strong interlayer coupling can lift the graphene surface and preserve intrinsic electronic features of both constituents. Another investigation has employed hydrogen-bonded two-dimensional networks of cyanuric acid and melamine on monolayer MoS₂ and WSe₂ to achieve cooperatively amplified n-type doping densities exceeding 10¹³ cm⁻². When used as a buffer layer, this supramolecular lattice also dramatically enhances hydrogen evolution activity, outperforming platinum catalysts under gate modulation.

Charge Transfer Dynamics in Two-Dimensional Heterostructures publication trend

The graph below shows the total number of articles in charge transfer dynamics in two-dimensional heterostructures across all publications each year (not limited to Nature Index journals).

Technical terms

van der Waals heterostructure: A stacked assembly of two-dimensional layers held together by weak van der Waals forces rather than covalent bonds.

Charge transfer dynamics: The processes and timescales governing the movement and separation of electrons and holes across material interfaces.

Interlayer coupling: The electronic and structural interactions between adjacent layers in a heterostructure that influence charge transfer and band structure.

Doping: The introduction of impurities or molecular species to modulate the charge carrier concentration in a semiconductor.

Exciton: A bound state of an electron and a hole, held together by Coulomb attraction within a semiconductor.

Photoelectric gating: The modulation of electronic properties by long-lived charges trapped at an interface upon illumination.

References

1. Large-scale 2D heterostructures from hydrogen-bonded organic frameworks and graphene with distinct Dirac and flat bands. Nature Communications (2024).
2. Boosting the electronic and catalytic properties of 2D semiconductors with supramolecular 2D hydrogen-bonded superlattices. Nature Communications (2022).
3. Enhancing the Carrier Transport in Monolayer MoS2 through Interlayer Coupling with 2D Covalent Organic Frameworks. Advanced Materials (2023).
4. Heterostructures based on inorganic and organic van der Waals systems. APL Materials (2014).
5. Large photoelectric-gating effect of two-dimensional van-der-Waals organic/tungsten diselenide heterointerface. npj 2D Materials and Applications (2018).