Graphene Field Effect Transistor Radiation Sensor Architecture
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Solution Overview
Problem
Conventional radiation detection devices lack optimal efficiency, sensitivity, and cost-effectiveness, and often require complex manufacturing processes.
Innovation Solution
An apparatus comprising a first layer of sensors responsive to electric field changes, a second layer producing charge carriers in response to radiation, and a third layer of electrodes that can alter the electric field for selective readout, utilizing a graphene field effect transistor (GFET) for direct charge carrier detection without intermediary conversions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radiation detection devices are used, then radiation detection can be performed, but efficiency and sensitivity are not optimal
Solution Approach 1:
The patent introduces an intermediary layer that converts radiation into charge carriers, which are then detected by the sensor. This intermediary conversion process enhances both the sensitivity and efficiency of detection by optimizing each step of the detection chain separately rather than relying on a single direct detection mechanism.
Solution Approach 2:
The detector employs a composite structure combining multiple materials with complementary properties: a radiation-sensitive material for efficient charge carrier generation, a graphene layer for high-mobility charge transport, and a semiconductor substrate for detection. This composite approach optimizes both sensitivity and detection efficiency simultaneously.
2Reliability
If conventional radiation detection devices are used, then radiation detection can be performed, but manufacturing is more complex and costly
Solution Approach 1:
The detector is segmented into distinct functional layers: a radiation-sensitive layer for charge carrier generation, a graphene intermediate layer for charge transport, and a semiconductor substrate for detection. This segmentation allows each layer to be optimized and manufactured separately using suitable processes, then combined through standard semiconductor fabrication techniques, reducing overall manufacturing complexity while maintaining high detection performance.
Solution Approach 2:
The graphene layer serves multiple functions simultaneously: it acts as a charge carrier transport medium, provides structural support, and enables selective addressing through its electrical properties. This multi-functionality reduces the number of separate components needed, simplifying manufacturing while maintaining reliable detection performance.
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 configuration enhances radiation detection sensitivity, position sensitivity, and reduces manufacturing complexity, enabling efficient and cost-effective radiation imaging and medical applications with improved response times.
Implementation Method 1
a second layer comprising a substrate configured to produce one or more charge carriers in response to incident radiation
Implementation Method 2
a first layer comprising one or more sensors, wherein each sensor is configured to be able to detect changes in an electric field in the vicinity of the sensor
Data Source
Figure 1A~1C
Figure 2~3
Figure 4~5A
AI summary
An apparatus for sensing radiation is provided. Certain examples provide an apparatus 100 comprising: a first layer 101 comprising a sensor 101a(1), wherein the sensor is configured to be responsive to changes in an electric field in the vicinity of the sensor; a second layer 102 comprising a substrate 102a configured to produce charge carriers 102b in response to incident radiation 104; and a third layer 103 comprising a plurality of electrodes 103a(1)-103a(j), wherein the plurality of electrodes are configured to be selectively addressed during a readout operation of the sensor. Certain examples, relate to an apparatus for sensing X-rays or sensing neutrons comprising a graphene field effect transistor (GFET).