Radiation Detector Electrode Insulation Against Oxidation

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Solution Overview

Problem

Existing radiation detection apparatuses face issues with electrode degradation due to oxidation when exposed to outside air, as seen in U.S. Pat. No. 7,223,982, which protects semiconductor layers but not the electrodes.

Innovation Solution

A radiation detection apparatus is designed with an insulating layer covering the electrodes and semiconductor layer surfaces to shield them from external influences, using materials like silicon nitride or aluminum oxide to prevent degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the semiconductor layer is covered with an organic layer to protect from outside air, then the moisture resistance of the semiconductor layer is improved, but the electrodes are still exposed to outside air and will deteriorate due to oxidation

Engineering Contradiction:

Improvemoisture resistance of semiconductor layerVSAvoidoxidation of electrodes

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The protective coating is divided into multiple functional layers: a first organic layer covering the semiconductor layer for moisture protection, and a second inorganic layer covering the electrodes for oxidation prevention. This segmentation allows each layer to address specific vulnerability of different components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inorganic layer acts as an intermediary protective barrier between the external environment and the electrodes. This layer specifically targets the oxidation vulnerability of electrodes while allowing the organic layer to continue protecting the semiconductor layer, thus mediating the protection of previously vulnerable components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If electrodes are exposed to outside air for electrical connection, then the ease of operation is improved, but the electrodes will deteriorate due to oxidation

Engineering Contradiction:

Improveelectrical connectionVSAvoidelectrode stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The protective inorganic layer is applied selectively to specific regions of the electrodes that require protection from oxidation, while maintaining electrical connection capabilities in other regions. This local application allows the electrodes to have both protective coverage and functional accessibility.

Inventive Principle:

Principle #3Local quality

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 insulating layer effectively protects the detection unit from external factors, thereby preventing electrode deterioration and maintaining apparatus performance.

Implementation Method 1

a semiconductor layer located on the first electrode, the semiconductor layer producing a charge corresponding to radiation incident on the radiation detection apparatus

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Implementation Method 2

there is a risk that the electrodes constituting the detection unit will deteriorate due to oxidation or the like if those electrodes are exposed to outside air

Methodology Applied

Scientific EffectOxidation prevention: Oxidation

Data Source

PatentUS20250389856A1Radiation detection apparatus, manufacturing method thereof, and radiation CT apparatus

Publication Date: 2025.12.25 CANON KK

AI summary

A radiation detection apparatus comprises a board, a first electrode located on the board, a semiconductor layer located on the first electrode, the semiconductor layer producing a charge corresponding to radiation incident on the radiation detection apparatus, a second electrode located on the semiconductor layer, the second electrode having a first surface contacting the semiconductor layer and a second surface opposite the first surface; and an insulating layer contacting the second surface of the second electrode.