Graphene PECVD Apparatus Gas Height Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In graphene manufacturing using plasma apparatuses, impurities from the damaged outer wall can be deposited on the substrate, causing cracks, pinholes, or overlayers during graphene growth, due to the generation of fine particles.
Innovation Solution
A graphene manufacturing apparatus with a specific gas supply configuration, including a reaction chamber, substrate supporter, plasma generator, and gas supply units for inert, carbon, and reducing gases, where the reducing gas is supplied at a controlled flow rate and height to minimize contact with the sidewall, and a PECVD process is used to grow graphene on a non-catalyst substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plasma apparatus is used to directly grow graphene on substrate, then graphene can be formed without catalyst, but fine particles are generated from damaged outer wall causing impurities
Solution Approach 1:
The harmful outer wall is extracted or removed from the reaction chamber to eliminate the source of fine particle contamination. This allows graphene to be grown without the harmful factors present in conventional plasma apparatuses with damaged outer walls.
Solution Approach 2:
A susceptor is introduced as an intermediary component between the plasma source and the substrate. The susceptor absorbs or filters the harmful effects from the plasma, preventing fine particles from reaching and contaminating the graphene layer while still enabling effective graphene growth.
2Manufacturing precision
If reducing gas is supplied close to substrate to prevent particle deposition, then impurity generation is reduced, but gas flow control becomes complex
Solution Approach 1:
The gas supply system utilizes vertical height positioning (z-dimension) to control gas delivery. By supplying reducing gas at a specific height above the substrate rather than directly at the substrate surface, the system reduces particle deposition while maintaining manageable flow control through vertical stratification of gas layers.
3Device complexity
If conventional plasma apparatus with damaged outer wall is used, then device structure is simple, but fine particles cause cracks and pinholes in graphene
Solution Approach 1:
The susceptor serves as a protective intermediary that filters harmful fine particles from the plasma before they can reach the substrate. This mediator approach maintains device structural simplicity while ensuring graphene layer integrity by blocking contamination pathways.
Solution Approach 2:
The harmful outer wall is removed or extracted from the reaction chamber, eliminating the source of fine particle contamination. This allows the system to maintain simplicity while improving reliability by growing graphene in a cleaner environment.
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 reduces the generation of unnecessary fine particles, minimizing defects in the graphene layer and enabling high-quality graphene growth at low temperatures, preventing cracks, pinholes, and overlayers.
Implementation Method 1
a plasma generator configured to generate a plasma inside the reaction chamber
Implementation Method 2
a third gas supply configured to supply a reducing gas into the reaction chamber
Implementation Method 3
directly growing graphene on a surface of the non-catalyst substrate based on supplying the carbon source, the inert gas, and the reducing gas into the reaction chamber in a plasma enhanced chemical vapor deposition (PECVD) process
Implementation Method 4
in a plasma enhanced chemical vapor deposition (PECVD) process that includes generating a plasma inside the reaction chamber
Data Source
AI summary
A graphene manufacturing apparatus includes a reaction chamber a substrate supporter configured to structurally support a substrate inside the reaction chamber; a plasma generator configured to generate a plasma inside the reaction chamber; a first gas supply configured to supply an inert gas into the reaction chamber at a first height from an upper surface of the substrate supporter in a height direction of the reaction chamber; a second gas supply configured to supply a carbon source into the reaction chamber at a second height from the upper surface of the substrate supporter in the height direction of the reaction chamber; and a third gas supply configured to supply a reducing gas into the reaction chamber, wherein the first to third gas supply units are disposed at different heights at a third height from the upper surface of the substrate supporter in the height direction of the reaction chamber.