Enhanced Reliability of Ultra-Scaled Interconnects Using Interlayer-Doped Aligned Carbon Nanotube-Metal Composites.

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Continuous scaling of electronic devices and 3D stacked circuits challenge traditional metal interconnects.
• Issues like increased electrical resistivity and electromigration hinder performance in miniaturized technology nodes.
• Copper (Cu) interconnects face limitations in reliability and electromigration resistance at smaller scales.

Purpose of the Study:

• To develop a high-performance alternative to conventional copper interconnects.
• To address electrical resistivity and electromigration issues in scaled-down electronic devices.
• To explore the potential of metal-interlayer-carbon composites for next-generation 3D integrated circuits.

Main Methods:

• Investigated CMOS-compatible metals like Ruthenium (Ru) and Palladium (Pd).
• Integrated single-walled carbon nanotubes (CNTs) with metals via wafer-scale aligned coating.
• Utilized an atomically thin intermittent layer for charge transfer doping to improve interface conductivity.

Main Results:

• Transmission Line Method (TLM) measurements demonstrated significant reductions in sheet and contact resistance.
• The composite structure effectively mitigated grain boundary scattering.
• Enhanced overall performance and reliability of interconnects in highly scaled devices.

Conclusions:

• The metal-interlayer-carbon composite offers a promising solution for advanced interconnects.
• This approach enhances conductivity and reliability, crucial for next-generation 3D IC technology.
• The findings support the use of these composites in future scaled electronic devices and packaging.