Radiation Detector Sidewall Layers for Uniform Pixel Energy Resolution
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Solution Overview
Problem
Multichannel radiation detectors exhibit lower energy resolution in pixel electrodes positioned in the outer peripheral portion compared to those in the central portion.
Innovation Solution
A radiation detector design incorporating an insulating layer and a conductive layer on the side surface of the semiconductor crystal portion, with specific materials and thicknesses, to improve energy resolution in the outer peripheral pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixel electrodes are positioned in the outer peripheral portion of the radiation detector, then the detection area is increased, but the energy resolution deteriorates
Solution Approach 1:
The patent applies different structures to different regions of the radiation detector. Specifically, it introduces a guard ring electrode structure around the peripheral pixel electrodes, while central pixel electrodes maintain a different configuration. This local differentiation allows peripheral electrodes to achieve energy resolution comparable to central electrodes while maintaining the expanded detection area.
Solution Approach 2:
The guard ring electrode acts as an intermediary element between the peripheral pixel electrodes and the semiconductor crystal. It mediates the electric field distribution in the peripheral region, preventing field distortion that would otherwise degrade energy resolution. This intermediary structure enables peripheral electrodes to function with resolution comparable to central electrodes.
2Device complexity
If a conventional radiation detector structure is used, then the device complexity is low, but the energy resolution uniformity across pixel electrodes deteriorates
Solution Approach 1:
The patent introduces a guard ring electrode structure specifically around peripheral pixel electrodes, creating a localized modification that addresses the energy resolution uniformity issue. This selective structural differentiation between central and peripheral regions achieves uniform energy resolution across all pixel electrodes while maintaining overall structural simplicity.
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
The design enhances energy resolution uniformly across all pixel electrodes, enabling accurate imaging and improved detection characteristics, particularly in applications requiring multiple simultaneous imaging.
Implementation Method 1
when radiation is incident on and interacts with a semiconductor crystal constituting a radiation detector in a state where a voltage is applied between the common electrode and the plurality of pixel electrodes, electrons and holes are generated in the semiconductor crystal
Implementation Method 2
Each of the electrons and holes is accelerated by a voltage applied to the semiconductor crystal, and is detected as a current
Data Source
AI summary
A radiation detector includes a first portion including a first electrode portion, a semiconductor crystal portion, and a second electrode portion facing the first electrode portion in this order, and a second portion provided so as to surround a side surface of the semiconductor crystal portion. The second portion includes an insulating layer and a conductive layer in this order from the side surface of the semiconductor crystal portion, and the second electrode portion includes a plurality of pixel electrodes.