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Environmental Changes in MoTe2 Excitonic Dynamics by Defects-Activated Molecular Interaction.

Bin Chen, Hasan Sahin1, Aslihan Suslu

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|April 15, 2015
PubMed
Summary

Molybdenum ditelluride (MoTe2) monolayer stability depends on initial luminescence. Oxygen exposure causes optical signal loss in weakly luminescent samples but blue-shifts and saturates luminescence in strongly luminescent ones, revealing defect-mediated aging.

Keywords:
2D materialsMoTe2environmental stabilityexcitonsphotoluminescence

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Group VI transition metal dichalcogenides (TMDs) are crucial 2D materials.
  • Molybdenum ditelluride (MoTe2) has an infrared band gap but is sensitive to oxygen.
  • Understanding MoTe2 monolayer stability is vital for its applications.

Purpose of the Study:

  • To investigate the environmental stability of MoTe2 monolayers under oxygen exposure.
  • To elucidate the mechanisms behind MoTe2 monolayer degradation and transformation.
  • To correlate material properties with aging response.

Main Methods:

  • Environmental, time-dependent photoluminescence (PL) measurements.
  • Atomic Force Microscopy (AFM) and Raman spectroscopy for structural integrity.
  • X-ray photoelectron spectroscopy (XPS) and Density Functional Theory (DFT) calculations.

Main Results:

  • Weakly luminescent MoTe2 monolayers lose optical signal but retain structure.
  • Strongly luminescent MoTe2 monolayers show blue-shifted PL and intensity saturation.
  • Defect sites functionalized with O2 molecules alter excitonic dynamics and band gap states.

Conclusions:

  • Material properties and aging of MoTe2 monolayers are dictated by defects and oxygen interactions.
  • Environmental effects significantly impact the fundamental properties and excitonic dynamics of MoTe2.
  • Findings offer insights into the metastability and transformation of 2D materials like WTe2, silicone, and phosphorene.