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Metal-Semiconductor Junctions01:24

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Atomically Thin Ohmic Edge Contacts Between Two-Dimensional Materials.

Marcos H D Guimarães1, Hui Gao1, Yimo Han1

  • 1Kavli Institute at Cornell for Nanoscale Science, ‡Laboratory of Atomic and Solid State Physics, §Department of Chemistry and Chemical Biology, and ∥School of Applied and Engineering Physics, Cornell University , Ithaca, New York 14853, United States.

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|June 15, 2016
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Summary
This summary is machine-generated.

Researchers developed a scalable method for creating ohmic graphene edge contacts for atomically thin electronics. This technique achieves low contact resistance in transition-metal dichalcogenides (TMDs) like MoS2 and WS2, crucial for next-generation devices.

Keywords:
edge contactsgrapheneheterostructureohmic contactstransition-metal dichalcogenides

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Electrical contacts are critical in miniaturized electronic devices, especially for atomically thin materials like transition-metal dichalcogenides (TMDs).
  • Achieving low contact resistance with thin electrode materials is a significant challenge for TMD-based electronics.
  • Monolayer TMDs hold promise for future electronics but require efficient electrical interfacing.

Purpose of the Study:

  • To develop a scalable fabrication method for high-performance electrical contacts to monolayer TMDs.
  • To investigate the electrical properties of graphene edge contacts on molybdenum disulfide (MoS2) and tungsten disulfide (WS2).
  • To demonstrate ohmic behavior and low contact resistance for atomically thin electronic applications.

Main Methods:

  • Fabrication of wafer-scale, laterally connected graphene edge contacts to monolayer MoS2 and WS2.
  • Characterization of contact homogeneity, overlap, and gap using advanced imaging techniques.
  • Measurement of current-voltage (I-V) characteristics at room temperature and down to liquid helium temperatures.

Main Results:

  • A scalable method for creating graphene edge contacts to monolayer MoS2 and WS2 was successfully demonstrated.
  • Wafer-scale homogeneity was achieved with no observable overlap or gap between graphene and TMD layers.
  • A low average contact resistance of 30 kΩ·μm was obtained.
  • Linear current-voltage characteristics confirmed ohmic behavior at room temperature, maintained at cryogenic temperatures.

Conclusions:

  • Graphene edge contacts provide an effective solution for low-resistance electrical interfacing with monolayer TMDs.
  • The developed method is scalable and suitable for fabricating atomically thin electronic devices.
  • Ohmic contact behavior over a wide temperature range is crucial for reliable performance of future electronic components.