Thiol-Resin Planarization for Low-Temperature Flexible Electronics
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Solution Overview
Problem
Current photopatternable planarization materials for semiconductor devices require high temperatures for curing and often have poor adhesion to metal, ceramic, and organic layers, necessitating additional processing steps and energy input.
Innovation Solution
Thiol-containing resin compositions are used as photopatternable planarization layers, which can be initiated through photo- or thermally-initiated mechanisms, allowing for selective exposure and curing at low temperatures without the need for oxygen-free atmospheres, thereby enhancing adhesion to various semiconductor materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If commercially available photopatternable planarization materials (polyimides, acrylates, siloxanes, polybenzocyclobutene) are used, then planarization function is achieved, but curing requires very high temperatures (>200°C) which consumes significant time and energy
Solution Approach 1:
The patent changes the chemical composition parameters of the planarization material by incorporating thiol-containing polymers with specific molecular structures and functional groups that enable low-temperature curing through alternative reaction mechanisms, thereby reducing the curing temperature from >200°C to significantly lower temperatures while maintaining planarization effectiveness
Solution Approach 2:
The invention creates a composite material system combining thiol-containing polymers with specific crosslinking agents and additives that work synergistically to enable low-temperature curing, where the thiol groups form crosslinked networks at lower temperatures compared to traditional planarization materials
2Duration of action of moving object
If UV-curable compositions (vinyl fluorine containing polymers) are used, then curing time is reduced, but adhesion to metal, ceramic, and organic layers becomes poor
Solution Approach 1:
The patent modifies the chemical functional groups in the polymer composition by introducing thiol-containing groups that provide both UV-curability and enhanced adhesion properties, changing the chemical reactivity parameters to achieve strong bonding to metal, ceramic, and organic surfaces while maintaining rapid UV curing
Solution Approach 2:
The thiol-containing polymer acts as an intermediary material that bridges the gap between the UV-curing requirement and adhesion requirement, where the thiol groups specifically interact with metal, ceramic, and organic surfaces to provide strong adhesion while the polymer structure allows UV-initiated curing
3Manufacturing precision
If traditional photopatternable layers (polyimides, polybenzocyclobutenes) are used, then photopatterning is achieved, but additional high-temperature baking steps are required
Solution Approach 1:
The invention merges the photopatterning function and the planarization function into a single integrated layer that performs both functions simultaneously, eliminating the need for separate high-temperature baking steps while maintaining the precision of photopatterning and the effectiveness of planarization
4Temperature
If UV-curing of oxygen-sensitive materials (acrylics, vinyl fluorines) is performed, then low-temperature curing is achieved, but oxygen-free atmospheres are required
Solution Approach 1:
The patent converts the presence of oxygen, which is harmful to traditional UV-curable materials, into a non-issue by using thiol-containing polymers that are inherently resistant to oxygen inhibition during curing, allowing UV-curing to proceed effectively in ambient atmospheric conditions without requiring oxygen-free environments
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
The thiol-containing resins provide a planarization layer that can be cured at ambient temperatures, ensuring high adhesion and reducing the complexity and time required for semiconductor device fabrication, while maintaining a smooth surface finish.
Implementation Method 1
Through the selection of a resin that contains photosensitive initiators or catalysts, the resin may be initiated via a plurality of methods including photo- or thermally-initiated radical mechanisms, photo- or thermally-initiated anionic mechanisms, or photo- or thermally-initiated cationic mechanisms
Implementation Method 2
the favorable interaction between thiol moieties in the resin and the various metal, ceramic or other organic groups present at the surface of the semiconductor device may lead to a drastically increased adhesion when compared to other UV-cured resins
Data Source
AI summary
Provided is a method for forming an organic planarization layer. The method includes forming lithographically-patterned arrays atop a substrate; disposing a thiol-based photocurable resin on to the lithographically-patterned arrays to form a photocurable planarization layer; and curing the photocurable planarization layer to form a flat surface above the lithographically-patterned array.