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Related Experiment Video

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The Effect of Anodization Parameters on the Aluminum Oxide Dielectric Layer of Thin-Film Transistors
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Contact Engineering High-Performance n-Type MoTe2 Transistors.

Michal J Mleczko1, Andrew C Yu1, Christopher M Smyth2

  • 1Department of Electrical Engineering , Stanford University , Stanford , California 94305 , United States.

Nano Letters
|July 18, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed high-performance n-type Molybdenum Ditelluride (MoTe2) transistors, overcoming instability and contact issues. This advance is crucial for developing next-generation low-power electronics using two-dimensional (2D) materials.

Keywords:
MoTeTwo-dimensional materialsX-ray photoelectron spectroscopyhexagonal boron nitridemetal-insulator-semiconductor contactsscandiumsilverunipolar transport

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials like Molybdenum Ditelluride (MoTe2) offer potential for advanced electronics due to their unique properties.
  • Challenges such as ambient instability and Fermi level pinning at contacts have limited the exploration of MoTe2 for n-type transistors.
  • Achieving stable and efficient n-type behavior is critical for complementary logic circuits and low-power electronic applications.

Purpose of the Study:

  • To demonstrate high-performance unipolar n-type MoTe2 transistors.
  • To investigate and understand the factors limiting n-type contacts in MoTe2.
  • To explore strategies for mitigating contact resistance and improving electron injection.

Main Methods:

  • Fabrication of MoTe2 transistors with various contact metals (Ag, Sc, Ti, Cr, Au, Ni, Pt) and AlOx encapsulation.
  • Electrical characterization of transistor performance, including saturation current and contact resistance, across a temperature range.
  • Schottky barrier height extraction using an analytic subthreshold model.
  • Surface analysis using high-resolution X-ray photoelectron spectroscopy (XPS) to investigate interfacial chemistry.

Main Results:

  • Demonstrated unipolar n-type MoTe2 transistors with record high saturation currents (>400 μA/μm at 80 K, >200 μA/μm at 300 K).
  • Achieved relatively low contact resistance (1.2–2 kΩ·μm) using Ag contacts and AlOx encapsulation.
  • Identified interfacial metal-Te compounds as the primary cause of contact resistance.
  • Showcased improved electron injection using Sc contacts with an inserted hexagonal boron nitride (h-BN) layer, forming metal-insulator-semiconductor (MIS) contacts.

Conclusions:

  • The study successfully demonstrates high-performance n-type MoTe2 transistors, addressing key limitations for 2D electronics.
  • Understanding interfacial reactions is crucial for optimizing contacts to 2D materials.
  • The development of MIS contacts offers a promising route to further enhance electron injection and reduce Schottky barriers for n-type 2D devices.
  • This work significantly advances the potential of MoTe2 for future low-power electronic applications.