Direct Graphene Transfer via Aminosilane Coupling
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Solution Overview
Problem
Current graphene transfer methods result in residual polymer fragments on the graphene surface, leading to contamination and performance issues in graphene-based devices, hindering the development of high-performance electronic devices.
Innovation Solution
A method involving the formation of a conductive graphene layer on a growth substrate, application of a polymeric layer to a device substrate with a coupling agent, and peeling the growth substrate to achieve direct transfer of graphene without intermediate layers, utilizing a polyimide layer coupled with aminosilane for enhanced adhesion and contamination-free transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer-assisted transfer processes (PMMA or TRT) are used to transfer graphene onto substrates, then graphene can be successfully transferred to the substrate, but residual polymer fragments remain on the graphene surface causing contamination and reducing device performance
Solution Approach 1:
The patent extracts and removes the harmful polymer intermediate layer from the transfer process entirely. Instead of using PMMA or TRT as intermediate substrates, the invention directly transfers graphene from the growth substrate to the device substrate, eliminating the source of polymer contamination that degrades device performance
Solution Approach 2:
The patent introduces a coupling agent as a new intermediary substance that enables direct bonding between the graphene layer and the device substrate without requiring polymer intermediates. The coupling agent facilitates adhesion while avoiding the contamination issues of traditional polymer transfer methods
2Productivity
If traditional polymer transfer methods are used, then graphene can be transferred to substrate, but the top surface of graphene retains residual polymer fragments that negatively impact device performance
Solution Approach 1:
The invention extracts the problematic polymer intermediate step from the transfer sequence, achieving direct graphene transfer to the device substrate. This eliminates residual polymer fragments on the graphene surface while maintaining efficient transfer productivity
Solution Approach 2:
The patent changes the fundamental parameter of the transfer process by replacing polymer-based intermediates with a coupling agent-based direct bonding mechanism. This parameter change enables simultaneous achievement of high transfer efficiency and pristine graphene surface quality
3Ease of manufacture
If growth substrates are used for graphene formation, then graphene can be synthesized, but the growth substrate cannot be reused without proper cleaning
Solution Approach 1:
The invention extracts the graphene layer from the growth substrate through direct peeling without requiring chemical cleaning processes. The graphene is transferred intact to the device substrate, allowing the growth substrate to be reused multiple times without degradation or contamination
Solution Approach 2:
The patent enables recovery and reuse of the growth substrate by implementing a clean transfer mechanism. The graphene is removed via direct peeling leaving the growth substrate pristine and ready for subsequent graphene formation cycles, eliminating material loss
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 contamination-free transfer of graphene with reduced defects, achieving high electrical conductivity and allowing for the reuse of growth substrates, thereby improving device performance and reducing manufacturing costs.
Implementation Method 1
a coupling agent couples the polymeric layer to the device substrate
Implementation Method 2
coupling the polyimide layer to the graphene layer on the growth substrate
Data Source
AI summary
A method of forming a functionalized device substrate is provided that includes the steps of: forming a conductive layer on a growth substrate; applying a polymeric layer to a device substrate, wherein a coupling agent couples the polymeric layer to the device substrate; coupling the polymeric layer to the conductive layer on the growth substrate; and peeling the growth substrate from the conductive layer.