Enhanced Interlayer Charge Injection Efficiency in 2D Multilayer ReS₂ via Vertical Double-Side Contacts.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) van der Waals (vdW) layered materials exhibit unique physical properties.
• Interlayer resistance and Schottky barriers limit charge injection efficiency in 2D vdW multilayers.
• This limitation perturbs intrinsic properties, hindering device performance.

Purpose of the Study:

• To design a novel contact electrode structure for enhanced interlayer carrier injection.
• To investigate the impact of the new design on charge injection efficiency and device characteristics.
• To provide an advanced platform for high-performing 2D optoelectronic devices.

Main Methods:

• Development of vertical double-side contact (VDC) electrodes.
• Fabrication of 2D vdW multilayer devices with VDC configuration.
• Characterization of interlayer resistance, field-effect mobility, and current density.
• Comparison with conventional top-contact and bottom-contact configurations.

Main Results:

• VDC electrodes significantly enhance interlayer carrier injection efficiency.
• A 2-fold extended contact area of VDC reduces interlayer resistance effects.
• VDC suppresses current transfer length (≤1 μm) and specific contact resistivity (≤1 mΩ·cm²).
• Clear benefits of VDC demonstrated over conventional contact designs.

Conclusions:

• The VDC electrode design is a simple yet powerful method to improve charge injection in 2D vdW materials.
• This approach effectively overcomes limitations imposed by interlayer resistance and Schottky barriers.
• The VDC configuration offers a promising electronic device platform for high-performance 2D optoelectronics.