Graphene Contact Deposition Through a Soluble Polymer Coating
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Solution Overview
Problem
Current methods for forming electrical contacts on graphene surfaces often require complex processes like photolithography, which expose the graphene to air and moisture, compromising its integrity and properties.
Innovation Solution
A method involving a graphene layer with a polymer coating, where the polymer coating is contacted with a conductive metal-containing solution using inkjet printing, and the solvent is volatilized to deposit the metal, avoiding exposure to air and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography processes are used to form electrical contacts on graphene, then precise patterning and contact formation is achieved, but the graphene is exposed to air and moisture which compromises its integrity and properties
Solution Approach 1:
A polymer coating is applied as an intermediary layer over the graphene surface. This coating acts as a protective barrier that prevents direct exposure of graphene to air and moisture during the contact formation process. The polymer coating is subsequently patterned and removed to reveal the underlying graphene with formed contacts, thus mediating between the need for precise patterning and protection from environmental degradation
Solution Approach 2:
The polymer coating is applied to the graphene surface before any contact formation or patterning steps. This preliminary protective action ensures that the graphene is shielded from air and moisture exposure throughout the subsequent processing steps, allowing precise contact patterning to be performed without compromising graphene integrity
2Reliability
If photolithography processes are used to form electrical contacts on graphene, then electrical contacts are successfully formed, but the process complexity increases due to UV curing and solvent rinses
Solution Approach 1:
The invention extracts and removes the UV curing and solvent rinsing steps from the traditional photolithography process. By using a polymer coating that can be patterned and removed without these complex steps, the process is simplified while maintaining contact formation reliability. The essential function of photolithography (patterning) is retained through alternative means that eliminate the harmful and complex UV and solvent steps
3Ease of manufacture
If traditional contact formation methods are used, then electrical contacts are formed on graphene, but the graphene properties are compromised due to exposure to air and moisture
Solution Approach 1:
The polymer coating creates an inert protective environment over the graphene surface during manufacturing. This barrier prevents reactive interactions between graphene and atmospheric components (oxygen, moisture), maintaining graphene's compositional stability and properties throughout the contact formation process while allowing ease of manufacture through standard coating and patterning techniques
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 simplifies the process, reduces contamination, and results in robust, durable electrical contacts that maintain the graphene's advantageous properties, enabling efficient current flow without the need for photolithography.
Implementation Method 1
volatilising the solvent to deposit the conductive metal on the surface of the graphene layer structure
Data Source
AI summary
The present invention pro ides a method of providing an electrical contact on a graphene surface, the method comprising: (i) providing a graphene layer structure comprising one or more graphene layers and having a polymer coating on a surface thereof; (ii) contacting one or more portions of the polymer coating with a conductive metal-containing composition comprising a solvent, wherein the polymer coating is soluble in the solvent: and (iii) volatilising the solvent to deposit the conductive metal on the surface of the graphene layer structure.