Semiconductor X-ray Detector Packaging for Heat Management
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Solution Overview
Problem
Current semiconductor X-ray detectors face challenges in heat management, making it difficult to produce large-area detectors with a large number of pixels due to cumbersome heat management requirements.
Innovation Solution
The method involves bonding multiple chips with an X-ray absorption layer and an electronic layer to a substrate, using a support wafer and encapsulating them in a matrix, and routing signals through transmission lines to facilitate efficient signal processing and power distribution, eliminating the need for scintillators and improving heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semiconductor X-ray detectors use direct conversion of X-ray into electric signals, then spatial resolution is improved, but heat management becomes cumbersome
Solution Approach 1:
The patent divides the semiconductor X-ray detector into multiple independent chips, each with its own pixel array and electronic processing elements. This segmentation allows heat generated in each chip to be managed independently, reducing the cumulative heat management burden while maintaining high spatial resolution across the entire detector array.
Solution Approach 2:
The patent transitions from planar mounting to three-dimensional stacking architecture, where multiple chip layers are vertically integrated. This dimensional change enables heat dissipation in multiple directions and separates heat-generating elements from sensitive detection elements, improving thermal management while preserving spatial resolution.
2Quantity of substance
If large-area detectors with large number of pixels are produced, then detection capability is improved, but heat management difficulty increases
Solution Approach 1:
The detector is segmented into multiple smaller chips, each containing a subset of the total pixels. This allows the system to achieve large-area coverage with high pixel count while each individual chip generates and manages heat within manageable limits, avoiding the thermal burden of a single large chip.
Solution Approach 2:
Multiple chips are merged into a integrated detector assembly through precise alignment and bonding of corresponding electrical contacts. This merging achieves the desired large-area, high-pixel-count detection capability while distributing heat generation across multiple independent thermal zones that can be managed separately.
3Reliability
If electrical contacts are aligned and bonded between substrate and chips, then electrical connection is improved, but manufacturing complexity increases
Solution Approach 1:
Electrical contacts are pre-aligned and pre-bonded between the substrate and chips before final assembly. This preliminary action ensures reliable electrical connections are established in advance, simplifying the final manufacturing steps and reducing the complexity of achieving precise alignment during assembly.
Solution Approach 2:
A support wafer is used as an intermediary substrate during the bonding process, holding chips in precise alignment with the main substrate. This intermediary facilitates accurate electrical contact alignment and bonding while simplifying the manufacturing process by providing a stable reference framework during assembly.
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 approach enables the production of large-area semiconductor X-ray detectors with improved heat management, enhancing their efficiency and stability for applications like medical imaging and cargo scanning.
Implementation Method 1
Semiconductor X-ray detectors largely overcome this problem by direct conversion of X-ray into electric signals. 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 and swept under an electric field towards electrical contacts on the semiconductor layer.
Implementation Method 2
bonding a plurality of chips to a substrate; wherein the substrate comprises an X-ray absorption layer comprising a first plurality of electrical contacts; wherein each of the plurality of chips comprises an electronic layer comprising a second plurality of electrical contacts; mounting the chips to the substrate such that the first plurality of electrical contacts are electrically connected to the second plurality of electrical contacts
Data Source
AI summary
Disclosed herein is a method for making an apparatus suitable for detecting X-ray, the method comprising: obtaining a wafer and a substrate; wherein the substrate comprises an X-ray absorption layer comprising a first plurality of electrical contacts; wherein the wafer has multiple dies and comprises an electronic layer comprising a second plurality of electrical contacts and an electronic system configured to process or interpret signals generated by X-ray photons incident on the X-ray absorption layer; aligning the first plurality of electrical contacts to the second plurality of electrical contacts; mounting the wafer to the substrate such that the first plurality of electrical contacts are electrically connected to the second plurality of electrical contacts; wherein the substrate further comprises a transmission line electrically bridging at least some of the dies; wherein the second plurality of electrical contacts are configured to feed the signals to the electronic system.