Radial Ray Detector Protective Layer for Corrosion Prevention
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Solution Overview
Problem
Conventional indirect X-ray detectors face challenges in miniaturization and reliability due to corrosion of photoelectric conversion elements and electrode pads caused by high-reactivity halogen compounds in the scintillation layer, which also limits the enlargement of the light receiving section.
Innovation Solution
A radial ray detector design where a protective layer, composed of materials like poly-paraxylylene or diamond crystal, is applied continuously and integrally to the light receiving section, substrate-side electrode pads, base-side electrode pads, and interconnects, preventing direct contact with the scintillation layer and allowing for miniaturization or enlargement of the detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a scintillation layer made of high-luminance fluorescent materials like CsI is used, then signal output is improved, but corrosion of photoelectric conversion elements and electrode pads occurs due to high reactivity of halogen compounds
Solution Approach 1:
A protective layer is introduced as an intermediary between the scintillation layer and the photoelectric conversion elements/electrode pads. This protective layer prevents direct contact between the reactive halogen compounds in the scintillation layer and the sensitive electronic components, thereby eliminating corrosion while maintaining the high signal output benefits of CsI-based scintillation materials.
Solution Approach 2:
The detector structure employs a composite material system consisting of multiple layers with different functions: the scintillation layer (CsI) for high-luminance light emission, the protective layer for corrosion prevention, and the photoelectric conversion elements for signal detection. This composite structure allows each material to perform its optimal function without suffering from the drawbacks of direct interaction between incompatible materials.
2Reliability
If substrate-side electrode pads and interconnects are coated with protective layer, then corrosion protection is improved, but clearance must be secured between light receiving section and electrode pads
Solution Approach 1:
The protective layer is designed to integrally coat multiple components (substrate-side electrode pads, base-side electrode pads, and interconnects) in a unified continuous layer. This merging approach eliminates the need for separate protective coatings on each component and reduces layout complexity by allowing closer spacing between the light receiving section and electrode pads, as the integrated protective layer provides comprehensive corrosion protection without requiring additional clearance.
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 protective layer effectively prevents corrosion, enhances reliability, and allows for the use of high-luminance fluorescent materials like CsI, improving signal output and reducing production costs while enabling miniaturization or enlargement of the detector.
Implementation Method 1
a scintillation layer 4 which converts X-rays into visible light
Implementation Method 2
photoelectric conversion elements 2a for converting visible light into an electric signal
Data Source
AI summary
A light receiving section and a substrate-side electrode pad of a photoelectric conversion substrate, a base-side electrode pad and an interconnect arranged on a surface side of a base are integrally coated with a protective layer. A scintillation layer is formed on a surface side of the protective layer. Corrosion of a photoelectric conversion element of the light receiving section, the electrode pads and the interconnect is prevented by the protective layer. When they are integrally coated with the protective layer, the light receiving section and the substrate-side electrode pad of the photoelectric conversion substrate can be arranged with a distance therebetween shortened, thereby realizing miniaturization of a detector and enlargement of the light receiving section.