Graphene Structure Formation Using Preprocessing and Remote Plasma CVD
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Solution Overview
Problem
Existing methods for forming graphene structures struggle to achieve high coverage on substrates without causing ion damage or charge-up, and require complex catalyst activation processes.
Innovation Solution
A method involving preprocessing with a carbon-containing gas on a heated substrate without plasma, followed by plasma CVD using remote microwave plasma, to promote nucleation and creeping growth, eliminating the need for an activated metal catalyst layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If plasma CVD is performed directly on the substrate without preprocessing, then the process is simpler, but the graphene structure coverage is low
Solution Approach 1:
The patent applies preliminary action by performing a preprocessing step before the main plasma CVD process. The preprocessing involves supplying a carbon-containing gas to the substrate while heating it to form a carbon layer, which serves as a foundation for subsequent graphene growth. This preliminary carbon layer formation enables higher graphene coverage in the main process without requiring complex catalyst activation steps.
2Reliability
If a catalyst metal layer is used to form graphene, then the graphene formation is promoted, but ion damage and charge-up occur on the substrate
Solution Approach 1:
The patent extracts and eliminates the catalyst metal layer from the graphene formation process. Instead of using metal catalysts that cause ion damage and charge-up, the method directly forms a carbon layer on the substrate through preprocessing and then grows graphene on this carbon layer. This removal of the harmful catalyst component preserves substrate integrity while maintaining graphene formation efficiency.
Solution Approach 2:
The patent replaces the durable but harmful metal catalyst with a temporary carbon layer that serves its purpose during graphene formation. The carbon layer is formed through preprocessing, facilitates graphene growth, and can be removed or integrated into the final structure, avoiding the persistent damage caused by metal catalysts.
3Productivity
If catalyst activation is performed before graphene formation, then graphene growth is enhanced, but the process becomes more complex and time-consuming
Solution Approach 1:
The patent merges the carbon layer formation and catalyst activation functions into a single preprocessing step. By supplying a carbon-containing gas and heating the substrate, the process simultaneously creates the carbon foundation and activates it for graphene growth, eliminating the need for separate catalyst deposition and activation steps. This consolidation reduces processing time while maintaining enhanced graphene growth rates.
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 enables the formation of graphene structures with high coverage and improved crystallinity, reducing substrate damage and simplifying the process by omitting catalyst activation steps.
Implementation Method 1
performing preprocessing by supplying a first processing gas including a carbon-containing gas to the substrate while heating the substrate
Implementation Method 2
forming a graphene structure on a surface of the substrate through a plasma CVD using plasma of a second processing gas including a carbon-containing gas
Implementation Method 3
plasma CVD using remote microwave plasma
Implementation Method 4
forming a graphene structure on a surface of the substrate through a plasma CVD
Data Source
AI summary
A method of forming a graphene structure, includes: providing a substrate; performing a preprocessing by supplying a first processing gas including a carbon-containing gas to the substrate while heating the substrate, without using plasma; and after the preprocessing, forming the graphene structure on a surface of the substrate through a plasma CVD using plasma of a second processing gas including a carbon-containing gas.