Graphene Electrode Interface With Adhesion Layer for Diffusion Blocking
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Solution Overview
Problem
The challenge lies in creating an electrode connecting structure with precise dimensions for reduced-size electronic devices, where the thickness of a general diffusion barrier film is limited, making it difficult to form a diffusion barrier effectively.
Innovation Solution
An electrode connecting structure is developed with an insulating layer, a graphene layer on the insulating layer, an adhesion layer of metal chalcogenide-based material, and a metal layer, where the adhesion layer is formed between the graphene and metal layers to enhance interface stability and prevent diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the electronic device is reduced, then the device size is minimized, but the thickness and width of the electrode connecting structure must also be reduced, making it difficult to form a diffusion barrier with sufficient thickness
Solution Approach 1:
The patent employs a composite barrier structure consisting of multiple layers: a first barrier layer (e.g., TaN), a second barrier layer (e.g., Cu), and a third barrier layer (e.g., TaN or W). This multi-layer composite approach provides sufficient diffusion barrier functionality even when the overall structure is miniaturized, as each layer contributes to the barrier performance. The composite structure allows the total thickness to be maintained at appropriate levels despite device size reduction.
2Device complexity
If a general diffusion barrier film is used, then the structure is simple, but the interface characteristics between graphene and metal layers are insufficient, leading to material diffusion
Solution Approach 1:
The patent introduces an adhesion layer as an intermediary between the graphene layer and the metal layer. This adhesion layer (e.g., TiN, TaN, or WN) serves as a mediator that improves interface characteristics, prevents direct contact between graphene and metal, and eliminates material diffusion. The intermediary layer ensures reliable electrical connection while maintaining interface stability.
Solution Approach 2:
The barrier structure uses composite materials with specific properties: the first barrier layer (TaN) provides initial diffusion protection, the adhesion layer (TiN/TaN/WN) ensures interface stability and electrical connection, and the second barrier layer (Cu/TaN/W) provides additional diffusion barrier functionality. This composite material approach achieves both simplicity and reliability.
3Length of stationary object
If the thickness of the diffusion barrier film is reduced to accommodate smaller device size, then the device can be miniaturized, but the diffusion barrier effectiveness is compromised
Solution Approach 1:
The patent uses a multi-layer composite barrier structure where the total thickness is optimized for miniaturization while each individual layer contributes to diffusion protection. The first barrier layer (e.g., 5-20 nm TaN), adhesion layer (e.g., 5-15 nm TiN/TaN/WN), and second barrier layer (e.g., 10-30 nm Cu/TaN/W) work together to prevent material diffusion effectively even at reduced overall thickness.
Solution Approach 2:
The adhesion layer acts as a critical intermediary that prevents direct diffusion pathways between graphene and metal layers. This intermediate layer (e.g., TaN, TiN, or WN) with appropriate thickness (5-15 nm) provides sufficient barrier functionality while allowing the overall structure to be miniaturized without compromising diffusion protection.
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 configuration improves the interface characteristics between the graphene and metal layers, providing a stable electrode connecting structure that prevents material diffusion and ensures high performance in electronic devices.
Implementation Method 1
a material, such as Ta or TaN is used for forming a diffusion barrier to prevent diffusion of copper outside of the electrode connecting structure or to prevent diffusion of an external material into the electrode connecting structure
Implementation Method 2
a conductive material, such as a highly conductive metal, conductive metal oxide, or conductive metal nitride has been generally used
Data Source
AI summary
Provided are an electrode connecting structure that includes an adhesion layer formed between a graphene layer and a metal layer and an electronic device having the electrode connecting structure. The electrode connecting structure may include an adhesion layer formed of a two-dimensional material provided between the graphene layer and the metal layer. The graphene layer may be a diffusion barrier, and the adhesion layer may stably maintain the interface characteristics of the graphene layer and the metal layer when the metal layer is formed on a surface of the graphene layer.