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  3. New Pathway For Hot Electron Relaxation In Two-dimensional Heterostructures.
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  3. New Pathway For Hot Electron Relaxation In Two-dimensional Heterostructures.

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New Pathway for Hot Electron Relaxation in Two-Dimensional Heterostructures.

Jin Zhang1,2,3, Hao Hong4, Jia Zhang1,3

  • 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , P. R. China.

Nano Letters
|August 15, 2018

View abstract on PubMed

Summary
This summary is machine-generated.

Two-dimensional heterostructures exhibit ultrafast charge dynamics. A newly discovered interfacial pathway enables rapid hot electron relaxation via interlayer hopping in MoS2/WSe2, crucial for optoelectronic devices.

Keywords:
2D heterostructureshot-electron relaxationtime-domain density functional theoryultrafast charge dynamicsvan der Waals coupling

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) heterostructures from transition-metal dichalcogenides are promising for optoelectronics.
  • Key properties like ultrafast charge dynamics and interlayer energy transfer are not fully understood.
  • Understanding these dynamics is vital for advancing photovoltaic and optoelectronic device applications.

Purpose of the Study:

  • To investigate photoexcited electron/hole dynamics in 2D heterostructures.
  • To explore the MoS2/WSe2 interface, known for its type II band alignment.
  • To elucidate ultrafast charge and energy transfer mechanisms at the atomic layer interface.

Main Methods:

  • Employed time-dependent density functional theory (TD-DFT) in the time domain.
  • Simulated photoexcited electron and hole dynamics.
  • Analyzed charge carrier lifetimes and relaxation pathways.

    • Main Results:

    • Observed ultrafast charge dynamics with carrier lifetimes ranging from tens to hundreds of femtoseconds.
    • Discovered a novel interfacial pathway for hot electron relaxation through interlayer hopping.
    • Demonstrated that this interfacial pathway is significantly faster than intralayer relaxation.

    Conclusions:

    • The MoS2/WSe2 heterostructure exhibits rapid charge carrier dynamics.
    • Interlayer hopping provides an efficient pathway for hot electron relaxation in 2D heterostructures.
    • This finding is critical for understanding ultrafast (<1 ps) photoinduced charge and energy transfer processes in these advanced materials.