Graphene Coated Surfaces via Atomic Layer Deposition
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Solution Overview
Problem
Current methods for coating surfaces with graphene face challenges such as high electrical resistivity of existing diffusion barriers, inability to scale down features proportionally, and unsatisfactory properties of graphene coatings, which hinder their industrial application.
Innovation Solution
A method for forming a graphene coating on a surface using thin layer deposition of molecular precursors, which involves injecting graphene molecular precursors into a reaction chamber and transforming them into a graphene coating, allowing for high-quality graphene deposition at relatively low growth temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TaN is used as diffusion barrier coating, then diffusion prevention is achieved, but electrical resistivity increases to 100-400 μΩcm
Solution Approach 1:
The patent changes the material parameter from TaN to graphene, which fundamentally alters the electrical resistivity while maintaining diffusion barrier functionality. Graphene's unique two-dimensional structure and electronic properties provide both diffusion prevention and low electrical resistivity, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent employs a composite structure combining graphene with other materials (such as Cu, Ag, or Al interconnect layers) to create a system where graphene provides diffusion barrier functionality while the metallic layers provide electrical conductivity, achieving both objectives simultaneously.
2Reliability
If diffusion barrier layer thickness is increased to prevent metal atom diffusion, then diffusion prevention improves, but feature scaling capability deteriorates
Solution Approach 1:
The patent changes the material from conventional TaN to graphene, which achieves effective diffusion barrier performance at atomic-scale thicknesses (single layer or few layers). This ultra-thin configuration enables continued feature scaling while maintaining diffusion prevention, as the barrier effectiveness is determined by material properties rather than thickness alone.
Solution Approach 2:
The patent utilizes graphene's two-dimensional thin film structure to provide diffusion barrier functionality at the thinnest possible scale. The single-layer or few-layer graphene structure acts as an ultra-thin flexible barrier that prevents metal atom diffusion without consuming significant vertical space, enabling continued miniaturization of interconnect features.
3Ease of manufacture
If conventional CVD or ALD methods are used for graphene deposition, then graphene coating is achieved, but coating quality and adhesion properties remain unsatisfactory
Solution Approach 1:
The patent introduces an intermediary treatment step (such as plasma treatment, surface functionalization, or use of adhesion promoters) between the substrate and graphene deposition process. This intermediary step enhances surface energy and chemical reactivity, improving graphene nucleation and adhesion to the substrate, thereby resolving the contradiction between ease of manufacture and coating quality.
Solution Approach 2:
The patent optimizes deposition parameters (temperature, pressure, precursor flow rates, deposition rate) to achieve high-quality graphene coatings with improved adhesion. By carefully controlling these parameters, the process produces graphene with fewer defects and better interfacial bonding, resolving the quality issues while maintaining manufacturing feasibility.
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 method enables the formation of high-quality graphene coatings with minimal defects, providing excellent thermal and chemical stability, good thermal conductivity, and strong adhesion to the substrate, thus overcoming the limitations of existing graphene coating techniques.
Implementation Method 1
The deposited first graphene molecular precursor is transformed into a graphene surface coating... The method may further comprise the step of depositing the at least one graphene molecular precursor on top of the surface by vacuum deposition
Implementation Method 2
The deposited first graphene molecular precursor is transformed into a graphene surface coating... allowing for high-quality graphene deposition at relatively low growth temperatures
Data Source
AI summary
Method of manufacturing graphene on surfaces by use of atomic layer deposition or molecular layer deposition by deposition of a graphene molecular precursor comprising an aromatic hydrocarbon on top of the surface followed by transforming the molecular graphene precursor into a graphene coating by means of a carbon-carbon bond formation reaction.