Two dimensional materials beyond MoS2: noble-transition-metal dichalcogenides

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• Layered noble-transition-metal dichalcogenides (MX2) are a class of materials with potential electronic applications.
• Understanding their electronic structure is crucial for designing novel electronic devices.

Purpose of the Study:

• To investigate the structural and electronic properties of MX2 (M=Pt, Pd; X=S, Se, Te) using density functional theory (DFT).
• To explore the effects of mechanical strain on the electronic band structure of these materials.
• To assess their suitability for flexible nanoelectronic applications.

Main Methods:

• Periodic density functional theory (DFT) calculations were employed.
• The electronic band structures of various MX2 compounds were computed.
• The impact of mechanical strain on band gaps and electronic properties was analyzed.

Main Results:

• MS2 monolayers function as indirect band-gap semiconductors.
• MSe2 and MTe2 analogues exhibit smaller band gaps, potentially becoming semimetallic or metallic.
• Mechanical strain induces a transition to quasi-direct band-gap semiconductors in MX2 materials.
• Deformation and electron-transport properties suggest potential for flexible nanoelectronics.

Conclusions:

• The electronic and structural properties of MX2 materials are highly tunable.
• Mechanical strain offers a pathway to engineer the band structure for specific applications.
• These materials hold significant promise for the development of next-generation flexible nanoelectronic devices.