Optoelectronic Properties of Van der Waals Heterostructures

Van der Waals heterostructures comprise atomically thin layers of distinct two-dimensional materials held together by weak interlayer forces. By selecting constituents with complementary electronic band structures and stacking them in precise sequences, researchers engineer bespoke optoelectronic responses. Key phenomena include ultrafast charge separation at type-II interfaces, interlayer exciton formation, and tunable band alignment via external fields or strain. Such control yields devices with high photoresponsivity, exceptional detectivity and rapid switching, spanning ultraviolet to infrared wavelengths. Techniques range from mechanical exfoliation and transfer to large-area chemical vapour deposition, each influencing interface quality and device performance. Advances in interface engineering, dielectric encapsulation and contact design have minimised recombination losses and Fermi-level pinning, driving quantum efficiencies above 60 per cent and response times below microseconds. These developments underpin applications in self-powered photodetectors, neuromorphic optoelectronic synapses, flexible imaging arrays and integrated photonic circuits. The ability to stack disparate materials without lattice matching expands the design space for next-generation low-power sensors, solar energy harvesters and optical communication components, highlighting global significance in sustainable technology and information processing.

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Optoelectronic Properties of Van der Waals Heterostructures publication trend

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Technical terms

Van der Waals heterostructure: A stack of two-dimensional materials held together by weak interlayer forces, enabling bespoke electronic and optical interfaces without lattice matching.

Type-II band alignment: A staggered configuration in which the conduction band minimum and valence band maximum reside in different layers, promoting efficient charge separation.

Photoresponsivity: The ratio of generated photocurrent to incident light power, expressed in amperes per watt (A W⁻¹), indicating detector sensitivity.

Detectivity: A figure of merit quantifying the smallest measurable optical signal, often given in Jones, and accounting for noise and device area.

External quantum efficiency (EQE): The percentage of incident photons converted into charge carriers collected at the electrodes, reflecting overall device efficiency.

References

1. Switchable Photoresponse Mechanisms Implemented in Single van der Waals Semiconductor/Metal Heterostructure. ACS Nano (2022).
2. A Single‐Step‐Grown Semiconducting vdW Heterostructure of Tungsten Oxide–Sulfide for High‐Performance Photodetection. Advanced Functional Materials (2022).
3. First-principles investigations of the controllable electronic properties and contact types of type II MoTe 2 /MoS 2 van der Waals heterostructures. Nanoscale Advances (2024).