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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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MoS2-Titanium Contact Interface Reactions.

Stephen McDonnell1,2, Christopher Smyth1, Christopher L Hinkle1

  • 1Department of Materials Science and Engineering, University of Texas at Dallas , Richardson, Texas 75080, United States.

ACS Applied Materials & Interfaces
|March 12, 2016
PubMed
Summary
This summary is machine-generated.

Titanium (Ti) deposition on molybdenum disulfide (MoS2) can form either TiO2 or Ti at the interface. Deposition conditions critically determine interface chemistry, impacting nanoelectronic device research.

Keywords:
MoS2Schottky barriersinterface chemistrytitanium contactsvacuum deposition

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • The titanium-molybdenum disulfide (Ti-MoS2) interface is crucial for nanoelectronic devices.
  • Understanding interface formation is key to controlling device performance.
  • Previous studies often assumed specific interface compositions.

Purpose of the Study:

  • To investigate the chemical states of Ti at the MoS2 interface under different vacuum conditions.
  • To determine the impact of deposition vacuum levels on interface reactions.
  • To clarify the actual interface composition in prior research.

Main Methods:

  • X-ray photoelectron spectroscopy (XPS) was used to analyze the Ti-MoS2 interface.
  • Depositions were performed under high vacuum (HV, ~1 × 10⁻⁶ mbar) and ultrahigh vacuum (UHV, ~1 × 10⁻⁹ mbar).
  • Analysis focused on the chemical species present at the interface.

Main Results:

  • High vacuum deposition resulted in titanium dioxide (TiO2) at the interface, with no detectable reaction with MoS2.
  • Ultrahigh vacuum deposition led to metallic titanium reacting with MoS2, forming titanium sulfides (Ti(x)Sy) and metallic molybdenum (Mo).
  • Interface chemistry is highly sensitive to deposition vacuum levels.

Conclusions:

  • The choice of vacuum conditions during Ti deposition significantly alters the Ti-MoS2 interface chemistry.
  • Many prior studies may have erroneously assumed Ti contacts when TiO2 was actually formed.
  • These findings necessitate a re-evaluation of existing research and have implications for future nanoelectronic device fabrication.