Radiation Detector Extended Electrode Insulation
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Solution Overview
Problem
Existing radiation detectors face issues with degradation of the charge conversion layer and potential creeping discharges due to pressure from high voltage lines and limited material options for electrodes, which affect radiation detection accuracy.
Innovation Solution
A radiation detector design featuring a charge conversion layer with an extended electrode portion that extends to the substrate without being on the charge conversion layer, an intermediary layer to enhance joining force, and a wiring system that applies bias voltage through the upper electrode portion, reducing pressure on the charge conversion layer and preventing discharges to the lower electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the high voltage line is connected directly to the upper electrode portion on the charge conversion layer, then the connection is simplified, but the charge conversion layer degrades due to compression and crystallization
Solution Approach 1:
The electrode is extended from a planar configuration onto the charge conversion layer to a three-dimensional configuration that runs along the side face of the charge conversion layer down to the glass substrate. This dimensional change allows the electrode to reach the substrate without compressing the charge conversion layer, thus maintaining reliability while achieving electrical connection.
2Reliability
If the upper electrode portion is led down the side face of the charge conversion layer to the glass substrate, then pressure on the charge conversion layer is reduced, but the adhesion between the electrode and glass substrate becomes problematic
Solution Approach 1:
An intermediary layer is introduced between the electrode and the glass substrate at the region where the electrode extends down the side face of the charge conversion layer. This intermediary layer serves as a mediator that provides sufficient adhesion strength to hold the electrode securely on the substrate without requiring the electrode material itself to have high adhesion properties, thus resolving the adhesion problem while maintaining the beneficial low-pressure configuration.
3Ease of manufacture
If a conductive connection pad is formed on the glass substrate using ITO film, then electrical connection is achieved, but there is a possibility of creeping discharges to the lower electrode portion
Solution Approach 1:
The electrode is extracted from the conventional configuration where it would form a connection pad on the glass substrate surface. Instead, the electrode is extended to run along the side face of the charge conversion layer and connect to the upper electrode portion, thereby removing the connection pad structure that could potentially cause creeping discharges to the lower electrode portion, while still achieving the necessary electrical connection function.
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 design effectively suppresses degradation of the charge conversion layer and ensures insulation from the lower electrode, maintaining detection accuracy and reliability while allowing for the use of materials with poor adhesion, such as gold, without increasing component complexity.
Implementation Method 1
a charge conversion layer that generates charge consequent to radiation being incident
Data Source
AI summary
A radiation detector that includes a charge conversion layer, a substrate, an electrode layer, an intermediary layer and wiring is provided. The substrate includes a lower electrode portion that collects charge generated by the charge conversion layer. The electrode layer includes an upper electrode portion and an extended electrode portion. The upper electrode portion is laminated on the charge conversion layer. The extended electrode portion extends from the upper electrode portion down a side face of the charge conversion layer to a region on the substrate at which the charge conversion layer is not present. The intermediary layer is formed from between the charge conversion layer and the upper electrode portion to between the extended electrode portion and the substrate. The wiring is electrically connected with the extended electrode portion at the region on the substrate at which the charge conversion layer is not present.