Semiconductor Radiation Detector With Interdigitated Electrodes
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Solution Overview
Problem
Current radiation detectors, particularly those based on semiconductor materials like CdZnTe, face challenges in optimizing the interdigitated electrode configuration and p-n junction design for enhanced radiation detection efficiency and signal-to-noise ratio, especially in room temperature operations for X-ray detection.
Innovation Solution
The radiation detector incorporates a semiconductor substrate with interdigitated electrodes and a p-n junction, where the electrodes are differentially biased and connected to electric contacts, with a radiation absorption layer comprising GaAs, CdTe, or CZT, and a polycrystalline semiconductor, optimizing electrode spacing and shape for improved charge carrier collection and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interdigitated electrodes are used in the semiconductor detector, then charge carrier collection efficiency is improved, but device complexity increases
Solution Approach 1:
The electrode system is segmented into multiple interdigitated fingers arranged in alternating patterns, allowing independent biasing of each electrode set. This segmentation enables efficient charge carrier collection by creating multiple collection paths while maintaining a manageable structural complexity through repetitive geometric patterns.
Solution Approach 2:
The electrode configuration transitions from simple planar contacts to three-dimensional interdigitated structures extending into the radiation absorption layer. This dimensional change allows electrodes to be positioned at optimal depths for charge collection while maintaining compact footprint, improving collection efficiency without proportionally increasing overall device complexity.
2Measurement precision
If p-n junction is implemented to separate charge carriers, then signal-to-noise ratio is improved, but manufacturing precision requirements increase
Solution Approach 1:
The p-n junction is formed by changing the doping parameters of the semiconductor substrate, creating regions with different carrier concentrations. This parameter-based approach allows precise control of junction characteristics and charge separation efficiency through doping concentration gradients, achieving high signal-to-noise ratio while using established semiconductor fabrication techniques.
3Productivity
If electrode spacing is optimized for charge carrier collection, then detection efficiency is improved, but device area increases
Solution Approach 1:
Multiple electrode fingers are nested within a compact interdigitated arrangement, with each subsequent finger positioned to utilize space efficiently. This nested configuration allows optimal electrode spacing for charge carrier collection while maintaining a small overall detector footprint, as electrodes are arranged concentrically rather than requiring linear expansion.
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 configuration enhances the detection efficiency and signal-to-noise ratio by effectively biasing electrodes and utilizing a p-n junction to separate charge carriers, allowing for precise registration and processing of radiation events, thereby improving the overall performance of the radiation detector.
Implementation Method 1
a radiation detector of this type may have a semiconductor layer that absorbs the radiation and generate charge carriers (e.g., electrons and holes)
Implementation Method 2
the semiconductor substrate comprises a p-n junction that separates the first set of electrodes from the second set of electrodes
Data Source
AI summary
Disclosed herein is a radiation detector comprising: an electronics layer comprising a first set of electric contacts and a second set of electric contacts; a radiation absorption layer configured to absorb radiation; a semiconductor substrate, portions of which extend into the radiation absorption layer in a direction of thickness thereof, the portions forming a first set of electrodes and a second set of electrodes; wherein the first set of electrodes and the second set of electrodes are interdigitated; wherein the semiconductor substrate comprises a p-n junction that separates first set of electrodes from the second set of electrodes; wherein the electronics layer and the semiconductor substrate are bonded such that the first set of electrodes are electrically connected to the first set of electric contacts and the second set of electrodes are electrically connected to the second set of electric contacts.