Graphene Sensor Coupled to TFET for Low Power Biological Signal Detection
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Solution Overview
Problem
Graphene sensors require a switching component capable of responding to low power electrical signals from biological organisms, as graphene itself is neither a conductor nor a semiconductor and lacks a band gap, making it unsuitable for digital logic circuits.
Innovation Solution
Integration of low power tunneling diodes or tunneling field effect transistors (TFETs) with graphene sensors, which can be activated by low power electrical signals to facilitate signal processing and redistribution among biological cells, utilizing nanowire structures and epitaxial growth techniques for efficient energy management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If graphene sensors are used to detect low power electrical signals from biological organisms, then sensitivity to weak signals is improved, but the inability of graphene to switch in response to those signals due to lacking a band gap prevents digital logic circuit operation
Solution Approach 1:
The patent introduces tunneling diodes or TFETs as intermediary switching components that couple the graphene sensor to digital logic circuits. These intermediary devices receive the weak electrical signals from the graphene sensor and perform the switching function that graphene itself cannot execute, thereby bridging the gap between the sensitive detector and the digital processing system.
2Adaptability or versatility
If conventional transistors are used for switching, then switching functionality is achieved, but power consumption increases and heat dissipation occurs which is undesirable in biological applications
Solution Approach 1:
The patent employs tunneling diodes and TFETs which operate based on quantum tunneling effects rather than conventional drift-diffusion mechanisms. This fundamental change in the operating parameter regime enables switching functionality at significantly lower voltage levels (less than 0.5 V compared to 0.8 V for state-of-the-art transistors), thereby reducing power consumption and heat dissipation for biological applications.
3Use of energy by moving object
If tunneling diodes or TFETs are used instead of conventional transistors, then power consumption is reduced and heat dissipation is minimized, but device fabrication complexity increases
Solution Approach 1:
The patent structures the system as modular components: graphene sensor elements, tunneling diode/TFET switching elements, and digital logic circuit blocks. Each segment can be independently designed, fabricated, and optimized. The tunneling diodes and TFETs are implemented as discrete switching components that can be integrated with the graphene sensor array in a systematic manner, managing fabrication complexity through modular segmentation.
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
Enables sensitive detection of low power electrical signals from biological organisms with minimal heat dissipation, allowing for efficient communication and potential therapeutic applications by redistributing charge among cells, while maintaining low power consumption.
Implementation Method 1
Tunneling diodes and TFETs are microelectronic devices that switch on and off in response to a relatively low applied voltage
Implementation Method 2
graphene's ability to conduct electrical signals suggests that the material can serve as an interface with biological cells that communicate by an electrical impulse
Data Source
AI summary
It is recognized that, because of its unique properties, graphene can serve as an interface with biological cells that communicate by an electrical impulse, or action potential. Responding to a sensed signal can be accomplished by coupling a graphene sensor to a low power digital electronic switch that is activatable by the sensed low power electrical signals. It is further recognized that low power devices such as tunneling diodes and TFETs are suitable for use in such biological applications in conjunction with graphene sensors. While tunneling diodes can be used in diagnostic applications, TFETs, which are three-terminal devices, further permit controlling the voltage on one cell according to signals received by other cells. Thus, by the use of a biological sensor system that includes graphene nanowire sensors coupled to a TFET, charge can be redistributed among different biological cells, potentially with therapeutic effects.