Detector-to-Substrate Adhesive Bonding for Planarity and Pixel Isolation
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Solution Overview
Problem
Existing methods for attaching detectors to electronic readout substrates face planarity issues, electrical shorting between pixels, and compromised mechanical strength, necessitating a solution that enhances connection reliability and minimizes these problems while being cost-effective and high-yielding.
Innovation Solution
A method involving the use of non-conductive adhesive material to form walls around electrically conducting pads on a substrate, with conductive adhesive material applied within these enclosures, and the detector surface contacting both adhesives, followed by thermal curing to ensure a strong and electrically isolated connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically conductive adhesive dots are used to connect detectors with electronic substrates, then electrical connection is achieved, but planarity problems occur due to gravity and high viscosity of the conductive drops
Solution Approach 1:
A non-conductive adhesive material is introduced as an intermediary between the detector and substrate. This intermediary material has lower viscosity than the conductive adhesive, enabling it to flow and fill gaps under gravity, thereby achieving planarity while the conductive adhesive provides electrical connection
Solution Approach 2:
The connection system uses a composite approach with two different adhesive materials: a non-conductive adhesive for mechanical bonding and planarity, and a conductive adhesive for electrical connection. Each material performs its specialized function without interfering with the other
2Reliability
If electrically conductive adhesive dots are used to connect detectors with electronic substrates, then electrical connection is achieved, but electrical shorting between pixels occurs
Solution Approach 1:
The adhesive application is segmented into two distinct components: non-conductive adhesive applied in spaces between pads for isolation, and conductive adhesive applied only on the pads for connection. This segmentation prevents electrical shorting while maintaining connection integrity
Solution Approach 2:
The non-conductive adhesive acts as an intermediary barrier between adjacent conductive pads, providing physical and electrical isolation that prevents shorting while allowing the conductive adhesive to establish proper electrical connections
3Reliability
If electrically conductive adhesive dots are used to connect detectors with electronic substrates, then connection is achieved, but mechanical strength is compromised as the entire mechanical strain is borne by the conductive adhesive drops
Solution Approach 1:
The connection system divides functions between two materials: the non-conductive adhesive handles mechanical bonding and strain absorption, while the conductive adhesive provides electrical connection. This multi-functional approach prevents mechanical strain from compromising the electrical connection
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 effectively addresses planarity and electrical shorting issues, providing mechanical strength and electrical isolation while maintaining a low-cost, high-yield process for detector-substrate connections.
Implementation Method 1
positioning a non-conductive adhesive material over the first surface, wherein the non-conductive adhesive material is positioned between each of the plurality of electrically conducting pads
Implementation Method 2
subjecting the detector attached to the substrate to thermal curing for a predefined period in order to cure the conducting adhesive material and the non-conducting adhesive material, wherein the thermal curing comprises applying heat at a temperature ranging from 40 degrees Celsius to 90 degrees Celsius
Data Source
AI summary
A method of attaching a detector onto a substrate that has an array of electrically conducting pads is provided, together with the resulting detector assembly. The method includes pouring a non-conductive adhesive material over a substrate surface, allowing the adhesive to settle between the conducting pads to form dams around the conducting pads, applying a conductive adhesive material onto the conducting pads of the substrate, and placing a surface of the detector on the substrate surface over the conducting and non-conducting adhesives to thereby attach the surface of the detector to the surface of the substrate.