Electrostatic Transfer of Graphene Layers
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Solution Overview
Problem
Existing layer transfer processes, such as the SmartCut™ process, often damage thin transfer layers like graphene due to high-energy ions, and struggle to produce graphene layers over large areas or on specific substrates.
Innovation Solution
A method using electromagnetic forces, specifically electrostatic forces between oppositely charged ions in the carrier substrate and the transfer layer, to transfer a graphene layer from a growth substrate to a carrier substrate without damaging it, employing a device with a chamber and substrate holder to align and detach the layer efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-energy ions are used in the SmartCut process to transfer the layer, then the transfer can be achieved, but the thin transfer layer (graphene) is damaged or destroyed
Solution Approach 1:
The patent changes the energy parameter of the ions from high-energy (as in SmartCut) to low-energy ions. Specifically, it uses ions with kinetic energy below 10 eV (preferably below 1 eV) to avoid damaging the graphene layer while still achieving effective transfer through the electrostatic attraction force.
Solution Approach 2:
The patent replaces the mechanical/physical bombardment mechanism of high-energy ion implantation with an electrostatic field-based transfer mechanism. The transfer is achieved through electrostatic attraction between oppositely charged ions and the transfer layer, eliminating the need for high-energy physical impact.
2Productivity
If wet-chemical processes are used to produce graphene flakes, then graphene can be produced industrially, but the graphene flakes are too small and not suitable for semiconductor industry applications
Solution Approach 1:
The patent introduces a carrier substrate as an intermediary component. The graphene layer is first grown on a growth substrate, then transferred to the carrier substrate using low-energy ions. This intermediary transfer mechanism enables the production of large-area graphene layers suitable for semiconductor applications while maintaining industrial scalability.
Solution Approach 2:
The patent changes the production scale parameter from small flakes (nanometre range) to large-area layers (wafer level). By using low-energy ion transfer, the process can handle large substrates while maintaining graphene quality, thus bridging the gap between industrial production capability and manufacturing precision requirements.
3Ease of operation
If the transfer layer is transferred from a growth substrate to a carrier substrate, then the layer can be positioned on the intended substrate, but the transfer process may damage the thin layer
Solution Approach 1:
The patent changes the ion energy parameter to below 10 eV (preferably below 1 eV), which is sufficient to achieve transfer through electrostatic attraction but too low to cause damage to the thin graphene layer. This parameter change enables simple transfer operation without harmful effects.
Solution Approach 2:
The patent replaces violent mechanical transfer methods with a gentle electrostatic field-based process. The low-energy ions create electrostatic attraction that gently pulls the graphene layer from the growth substrate to the carrier substrate, making the transfer operation simple while avoiding damage.
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
Enables the straightforward and efficient transfer of thin layers like graphene without damage, allowing for the production of large-area graphene layers on substrates with minimal surface roughness, promoting the growth of transfer layers on flat surfaces.
Implementation Method 1
the transfer takes place by means of an electromagnetic force
Implementation Method 2
The electromagnetic force is preferably an electrostatic force, which acts between ions in the carrier substrate and the transfer layer, in particular the graphene layer correspondingly charged with opposite polarity
Data Source
AI summary
The invention relates to a device for the transfer of a transfer layer from a substrate, in particular from a growth substrate, to a carrier substrate.