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Atomically precise graphene nanoribbon heterojunctions from a single molecular precursor.

Giang D Nguyen1, Hsin-Zon Tsai1, Arash A Omrani1

  • 1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.

Nature Nanotechnology
|September 26, 2017
PubMed
Summary

Atomically precise graphene nanoribbon (GNR) heterojunctions were fabricated using a novel late-stage functionalization method. This approach enables the creation of well-defined GNR heterojunctions from a single precursor for advanced electronic devices.

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Area of Science:

  • Materials Science
  • Nanoscience
  • Condensed Matter Physics

Background:

  • Atomically defined graphene nanoribbon (GNR) heterojunctions are crucial for nanoscale electronics.
  • Current synthesis methods rely on random copolymerization of distinct precursors.
  • A need exists for precise, controlled synthesis of GNR heterojunctions.

Purpose of the Study:

  • To report the fabrication and electronic characterization of atomically precise GNR heterojunctions.
  • To demonstrate a new synthesis strategy using late-stage functionalization.
  • To investigate the electronic properties of GNR heterojunctions within a single GNR.

Main Methods:

  • Fabrication of chevron GNRs from a single molecular precursor.
  • Late-stage functionalization via post-growth excitation and carbonyl group cleavage.
  • Characterization using bond-resolved scanning tunnelling microscopy (STM) at 4.5 K.
  • Electronic property analysis via scanning tunnelling spectroscopy (STS).
  • Validation through first-principles calculations.

Main Results:

  • Atomically well-defined GNR heterojunctions were successfully created within a single GNR.
  • STM imaging confirmed the precise GNR heterojunction structure at the atomic level.
  • STS revealed a type II band alignment across the heterojunction interface.
  • Band realignment occurred over a short distance (<1 nm), generating large effective fields.

Conclusions:

  • Late-stage functionalization offers a rational bottom-up approach for GNR heterojunction synthesis.
  • The developed method yields atomically precise GNR heterojunctions with tunable electronic properties.
  • These findings pave the way for designing next-generation nanoscale electronic devices based on GNRs.