Graphene Transfer Using Cured Polymer Precursors for Clean Delamination
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Solution Overview
Problem
Existing methods for transferring graphene, such as wet-type and dry-type transfer methods, face issues with defects and quality deterioration due to polymer residues and incomplete peeling, which hinder the effective use of high-crystallinity graphene in various applications.
Innovation Solution
A dry-type transfer method using a polymer precursor mixture that forms a strong bond with graphene, allowing for mechanical peeling without damaging the graphene, and enabling the reuse of the substrate, while also allowing for n-type doping and flexible, transparent electrode applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wet-type transfer method using polymer coating is used, then graphene can be transferred to substrate, but polymer residues remain on graphene causing defects and quality deterioration
Solution Approach 1:
The patent extracts and removes the polymer coating material from the transfer process entirely, replacing it with a polymer precursor mixture that cures in situ. This eliminates the source of polymer residues that cause defects and quality deterioration in conventional wet-type transfer methods.
Solution Approach 2:
The patent changes the physical and chemical parameters of the transfer medium by using a polymer precursor mixture that transforms from liquid state to solid state through curing. This parameter change enables the medium to be completely removed after transfer, unlike conventional polymers that leave residues.
2Ease of manufacture
If a dry-type transfer method using thermal peelable tape is used, then graphene can be transferred to substrate, but defects occur due to incomplete peeling or tape residues
Solution Approach 1:
The patent removes the thermal peelable tape from the process and replaces it with a polymer precursor mixture that adheres to graphene during curing. This eliminates the peeling step that causes defects and the tape residues that contaminate the graphene surface.
Solution Approach 2:
The polymer precursor mixture serves as an intermediary that temporarily holds graphene during transfer, then becomes part of the final structure through curing. This intermediary approach avoids the mechanical peeling process that causes damage in dry-type methods.
3Reliability
If polymer protection layer is used in transfer method, then graphene can be protected during transfer, but residues remain on graphene
Solution Approach 1:
The patent changes the state of the protection layer from permanent polymer to temporary polymer precursor that transforms during curing. This allows the protection layer to fulfill its protective function during transfer, then be completely removed or integrated without residues.
Solution Approach 2:
The patent converts the potential harm of polymer residues into a benefit by using a polymer precursor mixture that cures to form a removable or integratable structure. The curing process transforms the protection layer from a contaminant source into a controlled component that can be completely removed or becomes part of the final device structure.
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 effectively delaminates graphene without damaging it, improves surface quality, and allows for flexible and transparent device applications with controlled doping levels, maintaining chemical stability and low surface resistance even after mechanical bending.
Implementation Method 1
pressing the first substrate and the second substrate while curing the polymer precursor mixture
Implementation Method 2
the dopant material is cross-linked by the curing agent so that a network-structured polymer may be formed
Data Source
AI summary
The present disclosure relates to a method of transferring a graphene, the method comprising the steps of: forming a graphene on a first substrate; forming a polymer precursor mixture on a second substrate; disposing the graphene oppositely to the second substrate having the polymer precursor mixture formed thereon; pressing the first substrate and the second substrate while curing the polymer precursor mixture; and peeling off the first substrate.