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Passivating 1T'-MoTe2 multilayers at elevated temperatures by encapsulation.

Dennis Wang1, Kori Smyser, Daniel Rhodes

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA.

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|September 19, 2017
PubMed
Summary
This summary is machine-generated.

Multilayer 1T-molybdenum ditelluride (MoTe2) remains stable up to 550 °C when encapsulated by hexagonal boron nitride (hBN). Uncovered MoTe2 decomposes significantly at lower temperatures, with tellurium formation observed above 250 °C.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Chemical Engineering

Background:

  • 1T'-Molybdenum ditelluride (MoTe2) is a promising material for electronic and optoelectronic applications.
  • Understanding the thermal stability of 2D materials like MoTe2 is crucial for device fabrication and operation.
  • Hexagonal boron nitride (hBN) is often used as a protective layer for 2D materials.

Purpose of the Study:

  • To investigate the thermal decomposition of multilayer 1T'-MoTe2.
  • To evaluate the protective effect of hexagonal boron nitride (hBN) encapsulation on MoTe2 stability.
  • To determine the temperature thresholds for MoTe2 decomposition and byproduct formation.

Main Methods:

  • Heating experiments were conducted under flowing argon atmosphere.
  • Raman scattering spectroscopy was employed to monitor changes in MoTe2.
  • Optical microscopy was used to observe the physical state of the material.

Main Results:

  • Multilayer 1T'-MoTe2 showed minimal decomposition up to approximately 550 °C when encapsulated by multilayer hBN.
  • Significant decomposition of MoTe2 occurred at much lower temperatures in regions without hBN coverage.
  • Small amounts of tellurium byproduct were detected in the covered regions above 250 °C.

Conclusions:

  • Multilayer hBN encapsulation effectively protects 1T'-MoTe2 from thermal decomposition up to 550 °C.
  • The thermal stability of MoTe2 is highly dependent on the presence and quality of protective layers.
  • Decomposition pathways and byproduct formation are influenced by encapsulation and temperature.