Graphene FET Biosensor IC for Analyte Detection
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Solution Overview
Problem
Conventional transistor-based sensors have limited sensitivity and scalability for chemical and biological analysis, hindering effective detection and measurement of biological analytes.
Innovation Solution
A biosensor integrated circuit (IC) chip with graphene field effect transistors (gFETs) and reference electrodes, configured to sense changes in the chemical sensing Id-Vgs curve, enabling detection of biological analytes through shifts and transconductance changes, with a passivation layer and ion-permeable membrane for enhanced sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional transistor-based sensors are used, then device complexity is reduced and ease of manufacture is improved, but sensitivity and scalability for chemical and biological analysis deteriorate
Solution Approach 1:
The patent changes the material parameter from conventional semiconductor to two-dimensional nanomaterials (graphene, MoS2, WS2, WSe2), which fundamentally alters the electrical and sensing properties of the transistor channel, enabling enhanced sensitivity for chemical and biological analyte detection
Solution Approach 2:
The patent employs composite structures combining two-dimensional nanomaterials with conventional transistor components (source, drain, gate electrodes, dielectric layers), creating hybrid devices that leverage both the unique properties of 2D materials and the成熟的 manufacturing processes of standard transistors
2Measurement precision
If conventional transistor-based sensors are used, then ease of manufacture is improved, but scalability for chemical and biological analysis deteriorates
Solution Approach 1:
The patent segments the transistor channel into atomic-layer thin two-dimensional nanomaterials, which can be transferred and integrated onto conventional transistor structures, enabling step-by-step fabrication that combines advanced materials with standard manufacturing
Solution Approach 2:
The patent uses transfer techniques as an intermediary process, allowing two-dimensional nanomaterials to be fabricated separately on suitable substrates and then transferred to the transistor channel region, bridging the gap between advanced material synthesis and conventional semiconductor manufacturing
3Measurement precision
If two-dimensional nanomaterial-based gFETs are implemented, then sensitivity for biological analyte detection is enhanced, but device complexity increases
Solution Approach 1:
The patent applies two-dimensional nanomaterials specifically to the channel region where sensing occurs, while maintaining conventional structures in other parts of the device, thereby localizing the complexity enhancement to only where it provides maximum sensing benefit
Solution Approach 2:
The patent designs the gFET structure to serve multiple functions: the two-dimensional nanomaterial channel simultaneously provides high electrical conductivity for transistor operation and enhanced surface area for analyte interaction, enabling both electronic switching and sensitive detection
4Productivity
If two-dimensional nanomaterial-based gFETs are implemented, then scalability for chemical and biological analysis is improved, but device complexity increases
Solution Approach 1:
The patent segments the device into modular components (2D nanomaterial channel, source/drain electrodes, gate structure, dielectric layers) that can be independently fabricated and assembled, enabling parallel processing and batch fabrication for scalable production
Solution Approach 2:
The patent performs preliminary fabrication of two-dimensional nanomaterials on separate substrates using established chemical vapor deposition or other synthesis methods, allowing these materials to be prepared in advance and then transferred to transistor arrays, enabling batch processing and scaling
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
The solution provides improved sensitivity and scalability for detecting biological analytes by leveraging graphene gFETs and reference electrodes to measure shifts in the Id-Vgs curve, enabling precise detection of analytes such as ions, nucleic acids, and proteins.
Implementation Method 1
the graphene channel is configured to sense changes in a shape of a chemical sensing Id-Vgs curve in response to binding of the analyte to the capture region
Implementation Method 2
A liquid gate is formed above the top surface of the graphene channel upon receipt of the liquid
Data Source
AI summary
An apparatus includes a biosensor integrated circuit (IC) chip with sensing zones and/or well structures configured to receive a liquid with biological analytes. The chip includes a passivation layer with an opening over a channel layer and an array of graphene field effect transistors (gFETs) individually having a 2D graphene channel disposed on a dielectric oxide layer, a conductive drain, and a conductive source. A liquid gate is formed above the top surface of the graphene channel. The chip further includes reference electrodes formed in a metal layer, configured to contact the liquid, and disposed at a horizontal distance apart from the graphene channels. The individual gFETs are operable to enable a set of measurements to sense parameters of the biological analytes based on changes in a shape of Id-Vgs transconductance curves. A system and a method have similar structures and perform the functions of the apparatus.