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Related Experiment Video

Updated: Dec 26, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Controlling Exciton and Valley Dynamics in Two-Dimensional Heterostructures with Atomically Precise Interlayer

Hongzhi Zhou1, Yida Zhao1, Weijian Tao1

  • 1Centre for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027, China.

ACS Nano
|March 18, 2020
PubMed
Summary

Researchers precisely tuned exciton and valley dynamics in 2D heterostructures using hexagonal boron nitride (BN) interlayers. This BN intercalation significantly extends exciton and valley polarization lifetimes for advanced optoelectronic applications.

Keywords:
2D vdW heterostructuresBN insertioncharge transferinterlayer excitontransient absorption spectroscopyvalley polarization

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials and heterostructures offer potential for optoelectronics and spin/valleytronics due to strong excitonic and spin/valley properties.
  • Precise control over exciton and valley dynamics via structural tuning is critical but largely unexplored.

Purpose of the Study:

  • To demonstrate atomic-level fine-tuning of exciton and valley dynamics in 2D heterostructures.
  • To investigate the role of hexagonal boron nitride (BN) as an intermediate layer in controlling these dynamics.

Main Methods:

  • Fabrication of 2D heterostructures with varying thicknesses of hexagonal boron nitride (BN) interlayers.
  • Utilizing a quantum tunneling model to describe interfacial electron and hole transfer rates.
  • Experimental characterization of exciton and valley polarization lifetimes.

Main Results:

  • Interfacial charge transfer rates decrease exponentially with increasing BN thickness.
  • BN intercalation increases spatial separation, weakening Coulomb interaction and prolonging interlayer exciton and valley polarization lifetimes.
  • WSe2/WS2 heterostructures with monolayer BN showed a ~60 ps hole valley polarization lifetime at room temperature, significantly longer than controls.

Conclusions:

  • Hexagonal boron nitride (BN) interlayers provide a general and atomically precise method for tuning exciton and valley properties in van der Waals (vdW) heterostructures.
  • This approach offers a pathway to optimize materials for future optoelectronic and spin/valleytronic devices.