Detector-to-Substrate Adhesive Assembly for Planarity and Isolation
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Solution Overview
Problem
Existing methods for attaching detectors to electronic readout substrates face planarity issues due to gravity and high viscosity of conductive adhesives, leading to mechanical weakness and electrical shorting between pixels.
Innovation Solution
A method involving the use of non-conductive adhesive material to form walls around conductive pads on a substrate, with conductive adhesive material applied within these enclosures, allowing gravity-induced flow and thermal curing to enhance mechanical strength and prevent electrical shorts, using materials like epoxy glue or silver epoxy for isolation.
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:
The adhesive system is segmented into two distinct functional components: non-conductive adhesive dots that provide mechanical support and planarity, and conductive adhesive material that provides electrical connection. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
The non-conductive adhesive dots act as intermediary elements between the detector and substrate, providing a stable mechanical foundation that enables the conductive adhesive material to form proper electrical connections without suffering from gravity-induced deformation.
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 system is segmented into non-conductive and conductive components with distinct spatial assignments. The non-conductive adhesive dots are positioned at specific locations to provide mechanical support while inherently preventing electrical shorting between adjacent conductive pads.
Solution Approach 2:
The non-conductive adhesive material serves as an intermediary barrier between adjacent conductive pads, physically isolating them to prevent electrical shorting while still allowing the conductive material to establish proper electrical connections to the substrate.
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 mechanical load-bearing function is segmented from the electrical connection function. Non-conductive adhesive dots with higher mechanical strength properties handle the mechanical strain, while conductive adhesive material handles electrical connection, eliminating the need for conductive adhesive to bear mechanical loads.
Solution Approach 2:
The non-conductive adhesive dots act as intermediary mechanical support elements that bear the mechanical strain, allowing the conductive adhesive material to focus on establishing electrical connections without compromising mechanical strength.
4Strength
If non-conductive adhesive material forms walls around conductive pads with gravity-induced flow, then mechanical strength and electrical isolation are improved, but process time increases
Solution Approach 1:
The non-conductive adhesive dots are applied in advance to establish the structural framework and define pad boundaries before the conductive adhesive material is applied. This preliminary action prevents the need for extended curing or stabilization times after complete assembly.
Solution Approach 2:
The system utilizes gravity-induced flow of the conductive adhesive material to automatically fill and conform to the spaces defined by the non-conductive adhesive walls, eliminating the need for complex alignment or positioning procedures and reducing process time.
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 minimizes planarity issues and electrical shorting while providing a strong, cost-effective connection capable of withstanding mechanical strain, ensuring reliable detector-substrate attachment.
Implementation Method 1
positioning the first surface of the substrate above the surface of the detector to facilitate a gravity-induced flow of the conductive adhesive material toward the surface of the detector
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.