Protective Layer Composition for Printed Electronic Device Yield
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Solution Overview
Problem
The fabrication process of printed electronic devices, including the formation of protective coatings, often results in reduced yield due to damage from external forces, affecting the accuracy and efficiency of memory cell reading and writing.
Innovation Solution
A protective layer formed from a curable composition comprising amine modified polyester (meth)acrylate, (meth)acrylated amine oligomer, (meth)acrylate monomer, clay mineral, and photoinitiator is used to cover the electrode traces, enhancing the device's durability and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective coatings are formed during fabrication, then the memory cells are protected from external forces, but the device yield is reduced
Solution Approach 1:
The patent modifies the chemical composition parameters of the protective coating by incorporating specific additives (silane-modified polyester, clay minerals, waxes, oils) into the acrylic polymer matrix. These compositional changes alter the coating's mechanical properties to reduce stress on underlying electrode traces during curing and handling, thereby maintaining high yield while providing protection.
Solution Approach 2:
The protective coating is formulated as a composite material system combining acrylic polymer base resins with multiple functional additives including silane-modified polyesters for flexibility, clay minerals for reinforcement, and lubricants for stress reduction. This composite approach creates a multi-functional coating that simultaneously provides protection and maintains device yield by mitigating fabrication-induced stresses.
2Strength
If a protective layer is applied to cover electrode traces, then durability against external damage is enhanced, but fabrication complexity increases
Solution Approach 1:
The patent combines multiple protective functions into a single coating layer formulation rather than requiring separate layers for different protection needs. The composite coating simultaneously provides mechanical strength, flexibility, stress relief, and protection against external forces, thereby enhancing durability without proportionally increasing fabrication complexity.
Solution Approach 2:
By adjusting the chemical composition parameters of the coating (polymer type, additive concentrations, molecular weight distributions), the patent optimizes the coating's curing characteristics and mechanical properties to achieve high durability while maintaining compatibility with existing fabrication processes, thus avoiding significant increases in process complexity.
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 protective layer significantly increases the yield of printed electronic devices by providing effective protection against external damage, with a fully cured layer exhibiting no measurable defects and maintaining the device's electrical performance.
Implementation Method 1
a curable composition comprising an amine modified polyester (meth)acrylate, a (meth)acrylated amine oligomer, a (meth)acrylate monomer, a clay mineral, and a photoinitiator
Data Source
AI summary
Printed electronic devices are provided. In embodiments, such a device comprises a plurality of contact pads arranged in a pattern; a plurality of electrode traces arranged in another pattern, the plurality of electrode traces comprising a set of bottom electrode traces and a set of top electrode traces, each electrode trace in electrical communication with an associated contact pad of the plurality of contact pads; a plurality of memory cells, each memory cell located at an intersection of a pair of electrode traces of the plurality of electrode traces and comprising a bottom electrode layer formed from a region of one of the bottom electrode traces, a top electrode layer formed from a region of one of the top electrode traces, and a ferroelectric layer between the bottom and top electrode layers; and a protective layer covering the plurality of electrode traces, the protective layer formed from a curable composition comprising an amine modified polyester (meth)acrylate, a (meth)acrylated amine oligomer, a (meth)acrylate monomer, a clay mineral, and a photoinitiator.