Photopolymer Patterning for Organic Electronics
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Solution Overview
Problem
Conventional photolithography methods are challenging for organic electronic devices due to the sensitivity of organic materials to solvents and light, leading to degradation and inability to achieve fine pattern resolutions comparable to inorganic devices.
Innovation Solution
A method using a photopolymer with reduced fluorine content, coated with a hydrofluoroether solvent, exposed to patterned radiation, and developed with a hydrofluoroether-based solution to create precise patterns on organic electronic devices, maintaining orthogonal behavior with sensitive materials while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography methods are used, then inorganic devices can achieve fine pattern resolutions, but organic materials suffer degradation due to sensitivity to solvents and light
Solution Approach 1:
The patent changes the chemical parameters of the photopolymer by reducing fluorine content from conventional high levels to less than 30% by weight, and specifically incorporating acid-catalyzed solubility-altering reactive groups. This parameter change enables the photopolymer to be processed with non-fluorinated or low-fluorinated solvents that do not degrade organic electronic materials, while still achieving fine pattern resolutions through standard photolithography processes
Solution Approach 2:
The patent employs a disposable photopolymer layer that is specifically designed to be removed after patterning. The photopolymer with reduced fluorine content and acid-catalyzed solubility-altering groups can be easily deposited, patterned, and then completely removed using mild, non-degradative solvents, leaving the underlying organic electronic material intact and undamaged
2Reliability
If fluorinated solvents and high fluorine content photopolymers are used, then orthogonal processing is achieved, but manufacturing costs increase
Solution Approach 1:
The patent fundamentally changes the fluorine content parameter from conventional high levels (required for orthogonal processing) to reduced levels (less than 30% by weight). The acid-catalyzed solubility-altering reactive groups compensate for the reduced fluorine content, enabling the photopolymer to maintain orthogonal behavior with organic electronic materials while being processable with cheaper, non-fluorinated or low-fluorinated solvents
Solution Approach 2:
The patent extracts the essential functionality from high fluorine content photopolymers by identifying and isolating the critical acid-catalyzed solubility-altering mechanism. This extracted mechanism allows the photopolymer to achieve the desired orthogonal processing behavior without requiring expensive high levels of fluorine content, thereby reducing manufacturing costs while maintaining reliability
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 approach enables environmentally friendly and cost-effective patterning of organic electronic devices with high contrast and resolution, compatible with sensitive organic materials, and reduces the environmental impact of manufacturing processes.
Implementation Method 1
A method of patterning an organic electronic device using a photopolymer includes: forming a photopolymer layer on an organic electronic device substrate by coating a composition comprising a photopolymer and a hydrofluoroether coating solvent; exposing the photopolymer layer to patterned radiation to form an exposed photopolymer layer
Implementation Method 2
contacting the exposed photopolymer layer with a developing solution to remove unexposed photopolymer, thereby forming a developed structure having a first pattern of exposed photopolymer covering the substrate and a complementary second pattern of uncovered substrate
Data Source
AI summary
A photopolymer layer is formed on an organic device substrate and exposed to patterned radiation. The photopolymer layer includes a photopolymer comprising at least a first repeating unit having an acid-catalyzed, solubility-altering reactive group, wherein the total fluorine content of the photopolymer is less than 30% by weight. The pattern exposed photopolymer is contacted with a developing agent, such as a developing solution, to remove unexposed photopolymer, thereby forming a developed structure having a first pattern of exposed photopolymer covering the substrate and a complementary second pattern of uncovered substrate corresponding to the unexposed photopolymer. The developing agent comprises at least 50% by volume of a hydrofluoroether developing solvent.