Graphene Biosensor Transistor With Porous Insulating Interface
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Solution Overview
Problem
Conventional graphene field effect transistors (GFETs) suffer from reduced mobility due to Coulomb scattering from the base film, leading to low yield rates during the formation of graphene films on hollow structures.
Innovation Solution
The graphene transistor is designed with a porous insulating film that reduces contact area with the base film by having uneven structures, allowing graphene to be formed with a high yield rate by minimizing the influence of the base substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphene is formed on a hollow structure to reduce base film influence, then mobility is improved, but the formation yield rate deteriorates due to damages and stresses
Solution Approach 1:
The patent introduces a porous insulating film as an intermediary layer between the base film and graphene. This mediator reduces the direct contact area and minimizes the harmful influence of the base film on graphene while providing mechanical support during the transfer process, thereby improving both mobility and formation yield rate
Solution Approach 2:
The patent employs a porous insulating film with controlled porosity to create an optimized interface structure. The porous structure reduces the contact area between graphene and the base film, minimizing Coulomb scattering while maintaining structural integrity during fabrication, thus resolving the contradiction between mobility enhancement and formation yield
2Strength
If graphene contacts the base film on the entire surface, then structural support is improved, but mobility deteriorates due to Coulomb scattering
Solution Approach 1:
The patent applies local quality by creating regions with different contact characteristics. The porous insulating film provides local structural support where needed while maintaining areas of minimal contact to preserve graphene mobility, optimizing both strength and reliability locally across the device structure
Solution Approach 2:
The porous insulating film enables selective contact regions that provide structural support while minimizing Coulomb scattering areas, resolving the contradiction between strength and mobility through spatially differentiated material properties
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 design maintains ultrahigh mobility of graphene while improving the yield rate by reducing stress and damage during the transfer process, enabling efficient formation and integration of graphene transistors.
Implementation Method 1
the conventional GFETs, in which graphene serving as a channel is in contact with a base film (an example of an insulating part) on an entire surface and has a large contact area, are greatly affected by Coulomb scattering or the like of the base film
Data Source
AI summary
A semiconductor device includes a first gate electrode, an insulating part, a source electrode, a drain electrode, and a contact part. The insulating part is on one surface of the first gate electrode. The source electrode is connected to the insulating part. The drain electrode is connected to the insulating part. The contact part is between the source electrode and the drain electrode and on the insulating part. The contact part contains an atomic layered material. The contact part has a second part contactable with a sample. The second surface is opposite to a first surface facing the insulating part. A surface of the insulating part, the surface facing the contact part, has an uneven structure with respect to the first gate electrode.