Third Electrode Organic Detector Positional Dependency
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Solution Overview
Problem
Conventional detecting elements with thick organic semiconductor layers for radiation detection face sensitivity decline due to positional dependence of electron-hole pair generation, as electrons and holes move differently, affecting output signals.
Innovation Solution
Incorporating a third electrode, at least partially covered by an insulating film, between or within the organic conversion layer and the first and second electrodes, with different potential differences to minimize positional dependency and enhance signal sensitivity by controlling electrical fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic conversion layer is made thicker to efficiently deposit radiation energy, then the radiation detection efficiency is improved, but the output signal becomes positionally-dependent and detection sensitivity declines
Solution Approach 1:
The patent divides the conversion layer into multiple regions by introducing a third electrode that segments the layer into first and second conversion regions. This segmentation allows different portions of the thick conversion layer to be independently managed, enabling efficient radiation energy deposition across the entire thick layer while maintaining uniform signal output through separate charge collection paths for electrons and holes.
2Use of energy by moving object
If the conversion layer thickness is increased, then energy deposition efficiency is improved, but the difference in electron and hole movement distances increases causing positional dependency
Solution Approach 1:
The third electrode acts as an intermediary element within the conversion layer, introducing a reference potential that mediates the charge collection process. This intermediary electrode enables the thick conversion layer to efficiently deposit energy while maintaining signal uniformity by providing a intermediate collection point that balances the different movement characteristics of electrons and holes across the thick layer.
3Measurement precision
If a third electrode is added to reduce positional dependency, then detection sensitivity is improved, but device complexity increases
Solution Approach 1:
The third electrode serves multiple functions simultaneously: it segments the conversion layer into distinct regions, provides a reference potential for charge collection, and enables independent optimization of electron and hole collection paths. This multi-functionality allows a single additional electrode to address multiple aspects of the detection problem, improving sensitivity while limiting the increase in overall device complexity.
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 reduces positional dependency on electron-hole pair generation, maintaining detection accuracy and sensitivity while preventing dark current injection, thus enhancing the detection of radiation.
Implementation Method 1
an organic conversion layer, configured to convert energy of radiation into electrical charge
Implementation Method 2
with different potential differences to minimize positional dependency and enhance signal sensitivity by controlling electrical fields
Data Source
AI summary
According to an embodiment, a detecting element includes a first electrode, a second electrode, an organic conversion layer, a third electrode. The first electrode and the third electrode are configured to keep different potentials by DC power supply. The organic conversion layer is disposed in between the first electrode and the second electrode, and is configured to convert energy of radiation into electrical charge. The third electrode is disposed at least either in the organic conversion layer, or in between the organic conversion layer and the first electrode, or in between the organic conversion layer and the second electrode, and is at least partially covered by an insulating film.