Graphene Interconnects for Semiconductor RC Delay Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing interconnect structures in semiconductor devices face limitations in reducing resistance and capacitance, which affect device performance and reliability, particularly as device sizes shrink.
Innovation Solution
The formation of a multi-layer interconnect structure using graphene layers with U-shaped configurations and insulating layers, integrated within a dielectric layer structure, which reduces resistance and capacitance, and enhances adhesion between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal conductive layers are used in interconnect structures, then the structure is easier to manufacture with existing processes, but the resistance and capacitance are higher, leading to increased RC delay and reduced device performance
Solution Approach 1:
The patent changes the material parameter from traditional metal to graphene, which fundamentally alters the electrical properties (lower resistance and capacitance) of the interconnect structure. This material substitution resolves the technical contradiction by achieving superior electrical performance while establishing new manufacturing processes for graphene integration
Solution Approach 2:
The patent employs composite material structures by integrating graphene layers with dielectric materials and catalyst layers. The interconnect structure combines graphene conductive layers with surrounding dielectric materials, creating a composite system that achieves both low RC delay and structural integrity for manufacturability
2Productivity
If device size is continuously reduced to increase device density, then more devices can be integrated on a single wafer, but the resistance and capacitance of interconnect structures increase, affecting device performance and reliability
Solution Approach 1:
By substituting traditional metal with graphene, the patent changes the fundamental electrical parameters of the interconnect material. Graphene's superior electrical properties (lower resistance and capacitance per unit area) compensate for the increased interconnect challenges arising from device scaling, enabling continued device density improvement while maintaining interconnect performance
3Reliability
If graphene layers are used to reduce resistance and capacitance, then RC delay is lowered and device performance is improved, but the manufacturing process becomes more complex requiring catalyst layers and additional patterning steps
Solution Approach 1:
The patent segments the interconnect formation process into distinct functional layers: catalyst layers for graphene growth, graphene conductive layers for signal transmission, and dielectric layers for insulation. This segmentation allows each layer to be optimized independently and processed using specialized techniques, managing the overall complexity through modular construction
Solution Approach 2:
The patent introduces catalyst layers as intermediary structures that facilitate graphene formation. These catalyst layers serve as mediators between the chemical vapor deposition process and the final graphene conductive layer, enabling controlled graphene growth while providing a removable template that simplifies subsequent processing steps
4Productivity
If multi-layered interconnect structures are provided to increase device density, then more circuits can be manufactured on a single wafer, but the RC delay increases due to multiple conductive layers and via connections
Solution Approach 1:
By changing the material parameter from traditional metal to graphene in multi-layered interconnect structures, the patent reduces the resistance and capacitance of each individual layer. This parameter change compensates for the cumulative RC delay that would normally arise from multiple stacked interconnect layers, enabling high device density while maintaining fast signal transmission
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
This approach results in improved semiconductor device performance by lowering RC delay and increasing reliability through the use of graphene layers with lower resistance and capacitance compared to traditional metal conductive layers.
Implementation Method 1
forming a graphene layer on the catalyst layer
Data Source
AI summary
A method for forming a semiconductor device structure is provided. The method includes forming a first dielectric layer over a first substrate, and the dielectric layer has a plurality of openings. The method also includes forming a first graphene layer in the openings and over the first dielectric layer, and forming an insulating layer in the first graphene layer. The method further includes forming a second dielectric layer over the first dielectric layer and forming a second graphene layer in and over the second dielectric layer. A portion of the second graphene layer interfaces with a portion of the first graphene layer.