Detection Element Third Electrode Segmentation
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Solution Overview
Problem
In detection elements using organic conversion layers, increasing the thickness to improve radiation detection sensitivity leads to energy loss of holes due to thermal fluctuations, resulting in output signals that depend on both the number and position of electron-hole pairs, lowering detection sensitivity.
Innovation Solution
A detection element configuration with a first electrode, a second electrode, an organic conversion layer, and a third electrode, where the third electrode is placed within the organic conversion layer to create a higher electric field between the first and third electrodes, allowing electrons to travel further and reducing position-dependent output signals, while the second electrode is grounded to prevent gamma-ray detection and enhance sensitivity for other radiations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thickness of the organic conversion layer is increased to improve detection sensitivity for radiation other than gamma rays, then the detection sensitivity is improved, but holes generated in the organic semiconductor layer lose energy before reaching the electrode and get buried in thermal fluctuation, resulting in position-dependent output signals that lower detection sensitivity
Solution Approach 1:
The organic conversion layer is divided into multiple regions with different electric field strengths by introducing a third electrode. The layer is segmented such that regions closer to the radiation incident surface have higher electric fields to prevent hole energy loss, while regions farther away have lower electric fields. This segmentation allows the thick conversion layer to maintain both high detection sensitivity and effective charge collection without position-dependent signal degradation.
2Quantity of substance
If the thickness of the organic conversion layer is increased to improve detection sensitivity, then more electron-hole pairs are generated, but the output signal includes position dependency related to the generation position of electron-hole pairs, which lowers detection sensitivity
Solution Approach 1:
Different regions of the organic conversion layer are assigned different electric field qualities. Regions near the radiation incident surface (where holes are more likely to lose energy) are equipped with higher electric fields through the third electrode configuration. This local quality adjustment ensures that holes generated at different positions within the thick conversion layer are all effectively collected, eliminating position dependency in the output signal while maintaining high electron-hole pair generation quantity.
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 improves detection sensitivity by isolating the position dependency of electron-hole pairs, resulting in a more accurate output signal representing the number of electron-hole pairs generated, enhancing the detection of radiations like β-rays and neutron rays without gamma-ray interference.
Implementation Method 1
an organic conversion layer (16), which converts a radiation into an electric charge
Implementation Method 2
A bias is applied to the first electrode (12)
Data Source
AI summary
According to an embodiment, a detection element includes a first electrode, a second electrode, an organic conversion layer, and a third electrode. A bias is applied to the first electrode. The organic conversion layer is arranged between the first electrode and the second electrode, and is configured to convert energy of a radiation into an electric charge. The third electrode is arranged in the organic conversion layer.