Graphene-Capped IC Interconnects With Doped Adhesion Interface
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Solution Overview
Problem
The increasing density of interconnect structures in integrated circuits leads to higher resistance-capacitance (RC) delay and electromigration issues, particularly in conventional IC interconnect structures, which are not adequately addressed by the introduction of graphene alone.
Innovation Solution
Introducing a dopant, such as manganese or silicon, proximal to the interface between the graphene cap and the underlying metal in the interconnect structure to enhance adhesion and improve electromigration resistance while maintaining reduced electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If interconnect line dimensions are scaled down to increase density, then transistor density increases, but interconnect resistance increases
Solution Approach 1:
The patent applies composite materials by combining graphene with conventional metals (copper, cobalt, or tungsten) to form a hybrid interconnect structure. The graphene layer is deposited onto the metal interconnect line, creating a composite material system that leverages the high electrical conductivity of graphene to reduce overall interconnect resistance while maintaining the structural integrity and density benefits of scaled-down dimensions.
2Reliability
If graphene is introduced onto interconnect lines to reduce electrical resistance, then electrical resistance decreases, but adhesion between graphene and metal deteriorates
Solution Approach 1:
The patent introduces a dopant layer as an intermediary between the graphene and the metal interconnect. This dopant layer, containing elements such as manganese, silicon, or magnesium, serves as a mediator that enhances the adhesion between graphene and metal while preserving the electrical resistance benefits of the graphene coating. The dopant creates a transition interface that improves interfacial bonding without significantly degrading electrical performance.
Solution Approach 2:
The patent modifies the chemical composition parameters at the graphene-metal interface by introducing dopants. This changes the interfacial properties to improve adhesion strength. The dopant concentration and type are optimized to achieve the desired balance between adhesion enhancement and electrical resistance maintenance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The integration of a dopant at the graphene-metal interface improves electromigration resistance without significantly increasing electrical resistance, thereby enhancing the performance of interconnect structures in integrated circuits.
Implementation Method 1
An amount of a dopant, nitrogen or silicon within the interconnect structure is higher proximal to an interface of the graphene and the first metal than distal from the interface
Implementation Method 2
The introduction of graphene can reduce electrical resistance of an interconnect structure, particularly a line
Data Source
AI summary
Integrated circuitry interconnect structures comprising a first metal and a graphene cap over a top surface of the first metal. Within the interconnect structure an amount of a second metal, nitrogen, or silicon is greater proximal to an interface of the graphene cap. The presence of the second metal, nitrogen, or silicon may improve adhesion of the graphene to the first metal and/or otherwise improve electromigration resistance of a graphene capped interconnect structure. The second metal, nitrogen, or silicon may be introduced into the first metal during deposition of the first metal, or during a post-deposition treatment of the first metal. The second metal, nitrogen, or silicon may be introduced prior to, or after, capping the first metal with graphene.