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Realizing Optoelectronic Devices from Crumpled Two-Dimensional Material Heterostructures.

M Abir Hossain1, Jaehyung Yu1, Arend M van der Zande1,2

  • 1Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

ACS Applied Materials & Interfaces
|September 25, 2020
PubMed
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Engineered 2D heterostructures, like graphene and WSe2, can be crumpled into 3D nanostructures. These crumpled phototransistors maintain high performance, paving the way for flexible electronics.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Two-dimensional (2D) materials possess unique mechanical properties making them suitable for 3D nanostructure fabrication via crumpling.
  • Integrating 2D materials into heterostructures enables complex device geometries.

Purpose of the Study:

  • To demonstrate phototransistors based on crumpled 2D heterostructures.
  • To analyze the morphology and optoelectronic performance of these crumpled devices.
  • To establish a foundation for future 3D all-2D heterostructure devices.

Main Methods:

  • Uniaxial compression to study fold morphology in graphene and transition-metal dichalcogenide (TMD) monolayers.
  • Fabrication and characterization of crumpled graphene-TMD heterostructure phototransistors.
Keywords:
2D materialscrumpledheterostructuresphotodetectorstretchable

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  • Photoluminescence (PL) spectroscopy and photocurrent microscopy to assess optoelectronic properties.

    • Main Results:

    • 2D membranes relieve stress by forming folds, with spacing dependent on material type.
    • Crumpled graphene-WSe2 phototransistors exhibit minimal band gap shift (<2 meV) and strain (<0.05%) up to 15% biaxial crumpling.
    • Photoresponsivity reached 20 A/W, comparable to flat devices, with only a 20% increase after crumpling.

    Conclusions:

    • Crumpling and delamination effectively prevent compressive strain buildup in 2D heterostructures.
    • Crumpled 2D heterostructure devices maintain optoelectronic performance similar to their flat counterparts.
    • This work enables the development of flexible and stretchable electronic applications using 3D crumpled all-2D heterostructures.