Radiation Detector With Metal Layers For Light Attenuation
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Solution Overview
Problem
Current radiation detectors face challenges in enhancing sensitivity due to noise currents caused by ambient light, which reduces their effectiveness in detecting radiation.
Innovation Solution
A radiation detector design featuring a stacked body with a first metal layer, a second metal layer, and an organic semiconductor layer, where the organic semiconductor layer is positioned between the metal layers to suppress ambient light, and the metal layers are optimized in thickness and material selection to attenuate light and enhance backscattering of radiation, thereby increasing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ambient light is allowed to reach the organic semiconductor layer, then the device structure remains simple, but noise currents increase and detection sensitivity decreases
Solution Approach 1:
The device is segmented into multiple functional layers: a first metal layer, an organic semiconductor layer, and a second metal layer. This segmentation allows the second metal layer to specifically function as a light-blocking electrode, isolating the organic semiconductor layer from ambient light while maintaining a relatively simple overall device structure.
Solution Approach 2:
The second metal layer acts as an intermediary between the organic semiconductor layer and the ambient light environment. It blocks harmful light from reaching the sensitive organic semiconductor layer, thereby reducing noise currents without requiring complex additional shielding structures.
2Object-generated harmful factors
If a thick metal layer is used to block ambient light, then noise currents are suppressed, but the device becomes less sensitive to radiation
Solution Approach 1:
The second metal layer thickness is optimized to be between 1 nm and 100 nm, which is sufficient to block ambient light and suppress noise currents generated by photoelectric effects, yet thin enough to allow radiation particles to backscatter and be detected by the organic semiconductor layer, thus maintaining high radiation sensitivity.
Solution Approach 2:
The device employs a composite structure combining organic semiconductor materials with metal layers. This composite design leverages the light-blocking properties of metals while utilizing the radiation-sensitive properties of organic semiconductors, achieving both noise suppression and high detection sensitivity.
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 solution effectively suppresses noise currents and enhances the sensitivity of radiation detection, allowing for higher precision and external quantum efficiency while maintaining structural integrity by controlling the thickness and material properties of the metal layers.
Implementation Method 1
A radiation detector includes a stacked body. The stacked body includes a first metal layer, a second metal layer, and an organic semiconductor layer provided between the first metal layer and the second metal layer
Implementation Method 2
the metal layers are optimized in thickness and material selection to attenuate light and enhance backscattering of radiation
Implementation Method 3
the metal layers are optimized in thickness and material selection to attenuate light and enhance backscattering of radiation
Data Source
AI summary
According to one embodiment, a radiation detector includes a stacked body. The stacked body includes a first metal layer, a second metal layer, and an organic semiconductor layer provided between the first metal layer and the second metal layer.