Organic Semiconductor Aging Resistance via Multi-Layer Encapsulation
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Solution Overview
Problem
Organic electronic components degrade in the presence of air and water, leading to insufficient protection from known coatings, which affects their operational lifespan.
Innovation Solution
An electronic device structure comprising a substrate, an organic semiconductor component, and multiple oxygen- and water-tight layers, including a protective layer and an encapsulation layer made of epoxy or acrylate glue, with inorganic materials like silicon nitride and aluminum oxide, to enhance protection and extend the component's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single air- and water-tight coating is used to protect organic electronic components, then the device structure remains simple, but the protection against degradation is insufficient
Solution Approach 1:
The protective coating system is divided into multiple distinct layers: a first air- and water-tight coating layer, an encapsulation layer extending around the component, and a second air- and water-tight coating layer. This segmentation provides enhanced protection through multiple barrier layers, each contributing to the overall reliability against degradation.
Solution Approach 2:
The encapsulation layer is positioned to extend around the organic electronic component between the first and second coating layers, creating a nested structure where the component is enclosed within the encapsulation layer, which itself is protected by the outer coating layers. This nested arrangement maximizes protection while managing structural complexity.
2Reliability
If thicker protection layers are used to improve aging resistance, then protection effectiveness increases, but manufacturing complexity and material usage increase
Solution Approach 1:
Instead of applying one thick protection layer, the system uses multiple thinner layers (first coating layer and second coating layer) with an encapsulation layer in between. This segmentation achieves equivalent or superior protection thickness while improving manufacturability, as each layer can be applied and cured independently using standard processes like inkjet printing or slot-die coating.
Solution Approach 2:
The invention changes the parameter of layer thickness distribution, using multiple layers of optimized individual thicknesses rather than a single thick layer. Each layer's thickness and material composition can be independently optimized for its specific function, improving both protection effectiveness and ease of manufacture.
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 enhanced protection significantly increases the resistance to aging of organic electronic components, maintaining their operational performance for extended periods, as demonstrated by stable illumination and dark current curves over several hundred hours.
Implementation Method 1
an oxygen- and water-tight encapsulation layer, comprising an epoxy or acrylate glue, totally covering the organic semiconductor region
Implementation Method 2
the first and second protection layers each comprise at least one layer of an inorganic material selected from among silicon nitride, aluminum nitride, aluminum oxide, silicon oxide
Data Source
AI summary
An electronic device includes a substrate, a first oxygen- and water-tight protection layer covering the substrate, at least one electronic component located on the first protection layer and having at least one organic semiconductor region, an oxygen- and water-tight encapsulation layer, the oxygen- and water-tight encapsulation layer having an epoxy or acrylate glue totally covering the organic semiconductor region, a second oxygen- and water-tight protection layer totally covering the encapsulation layer, and a support layer covering the second oxygen- and water-tight protection layer.