Graphene Transfer via Substrate Trenches for Low Roughness
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Solution Overview
Problem
The transfer of CVD graphene to a substrate often results in high roughness due to voids formed during the drying process, making it difficult to apply to electronic devices effectively.
Innovation Solution
A method involving a substrate with trenches is used, where an adhesive liquid is applied and then dried, with the liquid being directed into the trenches using a roller, reducing the drying time and improving the adhesion of the graphene layer to the substrate, thereby reducing roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CVD graphene is transferred onto a substrate using conventional drying methods, then the graphene layer can be transferred to the substrate, but voids are caused between the graphene and substrate resulting in high roughness and uneven state
Solution Approach 1:
The substrate surface is segmented into trench regions and non-trench regions. The trenches act as dedicated channels for adhesive liquid removal, separating the drying function from the graphene support function. This segmentation allows adhesive liquid to be efficiently removed through trenches while the non-trench regions maintain graphene adhesion, resolving the contradiction between roughness and adhesion quality.
Solution Approach 2:
Trenches serve as intermediary structures that facilitate the removal of adhesive liquid from between the graphene layer and substrate. Instead of directly drying the entire surface, the trenches act as intermediate channels that guide and concentrate the drying action, enabling efficient adhesive removal without causing voids in the graphene-substrate interface.
2Productivity
If adhesive liquid is removed by drying the substrate without trenches, then the process is simple, but the drying time is long and the graphene remains in a high roughness state
Solution Approach 1:
The substrate surface is divided into trench regions for efficient adhesive liquid removal and non-trench regions for graphene support. This segmentation creates dedicated drying channels that significantly reduce drying time while maintaining surface flatness, as adhesive liquid is rapidly evacuated through the trench network without causing voids.
Solution Approach 2:
The trenches function as hydraulic channels that facilitate the rapid removal of adhesive liquid from the graphene-substrate interface. By providing dedicated liquid evacuation pathways, the trench structure enables fast drying rates while preventing the formation of voids and maintaining surface uniformity.
3Ease of manufacture
If the graphene layer is transferred without using trenches, then the transfer process is simpler, but the graphene layer achieves poor adhesion and high roughness making it difficult to apply to electronic devices
Solution Approach 1:
The substrate is segmented into trench regions that facilitate adhesive liquid removal and non-trench regions that provide stable graphene support. This segmentation enables effective adhesion and flat surface formation without significantly complicating the overall transfer process, as the trench pattern can be integrated into standard substrate fabrication.
Solution Approach 2:
Trenches serve as intermediary structures that mediate between the adhesive liquid and the graphene layer. During the transfer process, trenches act as temporary channels that guide adhesive liquid removal, enabling proper graphene-substrate adhesion and surface flatness formation while the trenches themselves are eventually removed or filled.
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 method significantly reduces the drying time and achieves a graphene layer with low roughness, enhancing the productivity of graphene-based electronic devices by ensuring even attachment and improved surface tension for better adhesion.
Implementation Method 1
removing the adhesive liquid by drying the substrate
Implementation Method 2
improving surface tension for better adhesion
Data Source
AI summary
A method of transferring graphene includes patterning an upper surface of a substrate to form at least one trench therein, providing a graphene layer on the substrate, the graphene layer including an adhesive liquid thereon, pressing the graphene layer with respect to the substrate, and removing the adhesive liquid by drying the substrate.