Integrated digital inverters based on two-dimensional anisotropic ReS2 field-effect transistors.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional transition metal dichalcogenides are promising for next-generation electronics.
• Anisotropic properties in materials can arise from reduced lattice symmetry.
• Exploring low-symmetry 2D materials is crucial for novel electronic functionalities.

Purpose of the Study:

• To investigate the anisotropic electronic properties of rhenium disulfide (ReS2) with a distorted 1T structure.
• To fabricate and characterize field-effect transistors based on monolayer and few-layer ReS2.
• To demonstrate the potential of ReS2 for integrated logic circuits.

Main Methods:

• Synthesis of atomically thin ReS2 flakes with a distorted 1T phase.
• Fabrication of monolayer and few-layer ReS2 field-effect transistors (FETs).
• Electrical characterization of ReS2 FETs, including current-voltage measurements and anisotropic ratio determination.

Main Results:

• ReS2 flakes exhibit significant in-plane anisotropic properties with an anisotropy ratio of 3.1.
• ReS2 FETs demonstrate high performance: current on/off ratios of ~10^7 and low subthreshold swings of 100 mV/decade.
• An integrated digital inverter using ReS2 FETs was successfully demonstrated with good performance.

Conclusions:

• Low-symmetry two-dimensional materials like ReS2 possess unique anisotropic properties valuable for electronics.
• ReS2 is a highly promising candidate for high-performance post-silicon electronic devices and logic circuits.
• The findings highlight the importance of crystal symmetry in designing advanced 2D electronic materials.