Graphene Sensor Structuring via Wet Transfer Tearing
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Solution Overview
Problem
Conventional methods for structuring graphene layers on carrier structures in graphene-based sensors are inefficient, particularly when producing large batches, as they require high-power laser irradiation for extended periods, leading to uneconomical processing times and undesired stray resistances and capacitances.
Innovation Solution
A method involving the formation of separating structures on a carrier substrate, matched to the tear strength of the graphene layer, allowing the graphene layer to tear during wet chemical transfer, thereby avoiding the need for subsequent removal and minimizing stray effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser structuring is used to remove graphene from undesired regions, then the graphene layer can be precisely structured, but the production time increases to several days for wafer-level production
Solution Approach 1:
The patent applies preliminary action by creating separating structures (such as trenches or elevations) on the carrier structure before transferring the graphene layer. These pre-formed structures guide the graphene to tear along desired paths during transfer, eliminating the need for subsequent laser structuring and enabling batch processing of entire wafers simultaneously, thus resolving the contradiction between precision and productivity
Solution Approach 2:
Instead of removing graphene from undesired regions after transfer (laser ablation approach), the patent inverts the approach by preventing graphene from adhering to undesired regions in the first place through separating structures. The graphene is transferred only where needed, and the separating structures naturally guide the tearing process, achieving precise structuring without time-consuming post-transfer removal steps
2Ease of manufacture
If the graphene layer covers the entire carrier structure, then the transfer process is simpler, but undesired stray resistances and capacitances are formed
Solution Approach 1:
The patent applies segmentation by dividing the carrier structure into separate regions using separating structures (trenches or elevations) that physically segment the surface. This causes the graphene layer to tear into distinct sections during transfer, covering only the desired sensor regions while leaving gaps between regions. This eliminates stray resistances and capacitances between regions while maintaining relatively simple transfer processes
Solution Approach 2:
The patent applies local quality by creating separating structures with specific local properties (different heights, materials, or geometries) that locally control where the graphene adheres and where it tears. The separating structures have properties tailored to induce controlled tearing at specific locations, ensuring graphene coverage only where needed while maintaining overall process simplicity
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 simplifies the production process, increases the accuracy and sensitivity of graphene-based sensors by enabling controlled tearing of the graphene layer, reducing unwanted resistances and capacitances without additional processing steps.
Implementation Method 1
the separating structures and a tear strength of the graphene layer are matched to one another such that the graphene layer respectively tears at the separating structures during the wet chemical transfer
Data Source
AI summary
In accordance with an embodiment, a method for producing a graphene-based sensor includes providing a carrier substrate; forming a carrier structure on the carrier substrate, wherein one or more separating structures are formed on an upper side of the carrier structure; and performing a wet chemical transfer of a graphene layer onto the upper side of the carrier structure that comprises the separating structures, where the separating structures and a tear strength of the graphene layer are matched to one another such that the graphene layer respectively tears at the separating structures during the wet chemical transfer.