Graphene FET Sensors for DNA Sequencing
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Solution Overview
Problem
Current DNA sequencing technologies face challenges in achieving high-speed, sensitive, and cost-effective detection due to limitations in sensor sensitivity and signal-to-noise characteristics, particularly with metal oxide semiconductor field effect transistors (MOSFETs) as biosensors, which are hindered by short channel effects and require bulky, expensive instrumentation.
Innovation Solution
The development of chemically-sensitive field effect transistors (FETs) with improved designs and fabrication techniques, including the use of 1D or 2D reaction layers, such as graphene, to create dense arrays that enhance measurement sensitivity and accuracy, allowing for rapid data acquisition and direct detection of DNA hybridization and sequencing reactions without the need for optically detectable labels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If metal oxide semiconductor field effect transistors (MOSFETs) are used as biosensors, then device integration is achieved, but sensor sensitivity and signal-to-noise characteristics deteriorate due to short channel effects
Solution Approach 1:
The patent changes the channel material from traditional metal oxide semiconductor to two-dimensional materials (graphene, MoS2, WS2, WSe2), fundamentally altering the physical parameters of the transistor channel to eliminate short channel effects while maintaining device integration
Solution Approach 2:
The patent employs composite structures combining two-dimensional materials with metal contacts and dielectric layers, creating a hybrid biosensor system that leverages the unique properties of each material to achieve both integration and high sensitivity
2Reliability
If traditional sequencing instrumentation is used, then DNA sequencing can be performed, but cost and instrument size increase
Solution Approach 1:
The patent extracts the core detection function from bulky traditional sequencing instrumentation and implements it in a miniaturized FET-based platform, removing unnecessary complexity while retaining essential sequencing capabilities
Solution Approach 2:
The patent replaces complex mechanical and optical detection systems with electronic field-effect detection using two-dimensional material channels, simplifying the instrumentation while maintaining or improving detection sensitivity
3Measurement precision
If 1D or 2D reaction layers are used in FET devices, then measurement sensitivity and data acquisition speed improve, but manufacturing complexity increases
Solution Approach 1:
The patent applies two-dimensional materials specifically in the channel region where they provide maximum benefit for sensitivity, while using conventional materials for contacts and encapsulation, optimizing the balance between performance and manufacturability
Solution Approach 2:
The patent selects two-dimensional materials that can serve multiple functions simultaneously - as the active channel, as the reaction layer for nucleic acid binding, and as a protective barrier, thereby reducing the number of fabrication steps required
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
These FET devices enable high-speed, sensitive, and cost-effective DNA sequencing and detection, overcoming the limitations of traditional MOSFETs by increasing sensor sensitivity and reducing the need for expensive instrumentation, facilitating portable and economical next-generation sequencing.
Implementation Method 1
graphene FET devices, systems, and methods of using the same for sequencing nucleic acids
Data Source
AI summary
Provided herein are devices, systems, and methods of employing the same for the performance of bioinformatics analysis. The apparatuses and methods of the disclosure are directed in part to large scale graphene FET sensors, arrays, and integrated circuits employing the same for analyte measurements. The present GFET sensors, arrays, and integrated circuits may be fabricated using conventional CMOS processing techniques based on improved GFET pixel and array designs that increase measurement sensitivity and accuracy, and at the same time facilitate significantly small pixel sizes and dense GFET sensor based arrays. Improved fabrication techniques employing graphene as a reaction layer provide for rapid data acquisition from small sensors to large and dense arrays of sensors. Such arrays may be employed to detect a presence and/or concentration changes of various analyte types in a wide variety of chemical and/or biological processes, including DNA hybridization and/or sequencing reactions. Accordingly, GFET arrays facilitate DNA sequencing techniques based on monitoring changes in hydrogen ion concentration (pH), changes in other analyte concentration, and/or binding events associated with chemical processes relating to DNA synthesis within a gated reaction chamber of the GFET based sensor.