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Probing Multiphased Transition in Bulk MoS2 by Direct Electron Injection.

Krishna P Dhakal1, Ganesh Ghimire1, Kyungwha Chung1

  • 1Department of Energy Science , Sungkyunkwan University , Suwon 16419 , Republic of Korea.

ACS Nano
|November 23, 2019
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Summary

Researchers achieved a nondestructive 2H to 1T

Keywords:
MoS2[Ca2N]+·e−electron injectioninterlayer weakeningmultiphase transition

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Layered two-dimensional (2D) materials exhibit diverse properties due to structural phase transitions.
  • Controlling phase transitions in bulk molybdenum disulfide (MoS2) via nondestructive methods remains a challenge.

Purpose of the Study:

  • To achieve and characterize the 2H to 1T' phase transition in bulk MoS2 using electron infusion.
  • To explore intermediate phases and their properties during the transition.
  • To investigate the potential of multiphase MoS2 for optoelectronic applications.

Main Methods:

  • Fabrication of MoS2/[Ca2N]+·e- heterostructures for direct electron injection.
  • Observation of phase transitions using Raman spectroscopy and bandgap measurements.
  • Theoretical calculations to elucidate the transition mechanisms.

Main Results:

  • Successful induction of the 2H to 1T' phase transition in bulk MoS2 via electron infusion.
  • Identification of intermediate lattice states during the multiphase transition.
  • Observed reduction in interlayer coupling and enhanced photoluminescence in the metallic regime.

Conclusions:

  • Demonstrated a novel method for nondestructive phase transition in bulk 2D materials.
  • Revealed unique optoelectronic properties arising from multiphase MoS2.
  • Suggests potential for light-efficient bulk MoS2 in optoelectronic devices.