Lithiation Induced Phases in 1T'-MoTe₂ Nanoflakes

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Molybdenum ditelluride (MoTe2) exists in multiple polytypes with unique electronic properties.
• Tuning these properties is crucial for advanced electronic applications.

Purpose of the Study:

• To investigate electrochemical lithium (Li) intercalation into 1T'-MoTe2 nanoflakes.
• To discover and characterize new lithiated phases of MoTe2.

Main Methods:

• Electrochemical lithium intercalation.
• In situ polarization Raman spectroscopy.
• In situ single-crystal X-ray diffraction.
• In situ Hall measurements.

Main Results:

• Two novel lithiated MoTe2 phases were discovered.
• These phases exhibit distinct structural and electronic properties compared to pristine 1T'-MoTe2.
• Lithiated phases show increasing resistivity with decreasing temperature and significantly reduced carrier densities.

Conclusions:

• Electrochemical intercalation is an effective method for creating new phases in 2D materials.
• This technique can tune phase stability and electron density in materials like MoTe2.
• Discovery of gapped phases in metallic 1T'-MoTe2 opens new avenues for electronic device engineering.