Multi-Layer Semiconductor X-Ray Detectors with Thermal Segmentation
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Solution Overview
Problem
Current semiconductor X-ray detectors face challenges in producing large-area detectors with many pixels due to cumbersome heat management, which complicates their manufacturing and reduces their effectiveness in applications like medical imaging and cargo scanning.
Innovation Solution
The system comprises multiple layers of X-ray detectors with semiconductor absorption layers and electronics layers, where vias and bonding wires are strategically used for electrical connections, and interposers are employed for mounting, allowing for efficient heat dissipation and improved pixel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semiconductor X-ray detectors with large area and large number of pixels are produced, then detection coverage and resolution are improved, but heat management becomes difficult or impossible
Solution Approach 1:
The detector is divided into multiple layers, with each layer containing a subset of pixels. This segmentation allows heat to be distributed across multiple smaller processing units rather than concentrated in a single large array, making thermal management feasible while maintaining high overall resolution through the combined capability of all layers
Solution Approach 2:
The patent transitions from a conventional two-dimensional pixel array to a three-dimensional stacked architecture. By adding the vertical dimension with multiple detector layers, the system achieves higher effective pixel count and resolution without proportionally increasing the thermal load on any single processing unit, as each layer can be independently managed
2Productivity
If multiple layers of X-ray detectors are stacked, then detection efficiency and spatial resolution are improved, but device complexity increases
Solution Approach 1:
Each detector layer is designed with identical or similar functional characteristics, allowing the same readout electronics and processing architecture to be reused across multiple layers. This universality simplifies the overall system design despite the increased number of layers, as the same modular unit is replicated rather than requiring unique designs for each layer
Solution Approach 2:
The patent implements a nested structure where multiple detector layers are stacked vertically, with each layer containing complete functional units (absorption layer and electronics). This nesting approach allows compact integration of multiple detection functions in a space-efficient manner, improving detection efficiency without proportionally increasing the device's external dimensions
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 enables the production of large-area detectors with high pixel density, enhancing the detectors' ability to handle X-ray flux and improve spatial resolution, thus expanding their applications in medical imaging, cargo scanning, and other fields.
Implementation Method 1
A semiconductor X-ray detector may include a semiconductor layer that absorbs X-ray in wavelengths of interest. When an X-ray photon is absorbed in the semiconductor layer, multiple charge carriers (e.g., electrons and holes) are generated
Implementation Method 2
an X-ray absorption layer and an electronics layer, wherein the X-ray absorption layer comprises a first doped region, one or more discrete regions of a second doped region, and an optional intrinsic region
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A system comprising multiple layers of X-ray detectors. The top layer may have through-wafer vias (126). The other layers may have bonding wires (701). The bonding wires (701) are shadowed by the X-ray absorption layers in the layers above.