Buffer Layer Adhesion for OLED Encapsulation
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Solution Overview
Problem
In OLED and thin-film transistor applications, poor adhesion at interfaces between different materials leads to film peeling, particle generation, and moisture exposure, compromising device performance and reliability.
Innovation Solution
A method involving the formation of a silicon-containing or nitrogen-containing buffer layer and plasma treatment to enhance surface adhesion, using a gas mixture with silicon and nitrogen gases in a processing chamber, and depositing an encapsulating barrier layer to improve interface bonding and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different materials (organic and inorganic layers) are used to form multiple layers in display devices, then device functionality is improved, but interface adhesion deteriorates
Solution Approach 1:
A buffer layer is introduced as an intermediary between the organic planarization layer and the inorganic encapsulating barrier layer. This buffer layer serves as a mediator that improves interface adhesion by providing compatible surface properties for both organic and inorganic materials, preventing peeling and particle generation at the interface while maintaining the functional benefits of using different materials.
2Reliability
If encapsulating barrier layers are formed to seal the device structure, then moisture protection is improved, but interface adhesion deteriorates due to different film properties
Solution Approach 1:
The buffer layer acts as an intermediary that enables the formation of encapsulating barrier layers with good moisture protection capability while maintaining strong interface adhesion. By providing a surface with appropriate properties for inorganic material deposition, the buffer layer ensures that the encapsulating barrier layer bonds strongly to both the underlying organic layer and the overlying inorganic structures, preventing peeling and maintaining sealing integrity.
3Strength
If plasma treatment is performed on the planarization layer surface, then interface adhesion is improved, but process complexity increases
Solution Approach 1:
Instead of using complex plasma treatment processes, the invention changes the fundamental parameter of the interface by introducing a buffer layer with specifically designed properties. This buffer layer provides inherent surface characteristics that promote strong adhesion between organic and inorganic layers without requiring additional plasma treatment steps, thereby simplifying the overall manufacturing process while achieving the desired adhesion improvement.
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 method effectively enhances interface adhesion, preventing film peeling and moisture ingress, thereby improving the reliability and longevity of OLED and thin-film transistor devices.
Implementation Method 1
supplying a buffer layer gas mixture including a silicon containing gas into the processing chamber... forming a buffer layer on the planarization material
Implementation Method 2
forming a buffer layer on the planarization material... supplying an encapsulating barrier layer deposition gas mixture including a silicon containing gas and a nitrogen containing gas into the processing chamber... and forming an encapsulating barrier layer on the buffer layer
Data Source
AI summary
The present disclosure describes methods of an interface adhesion improvement methods used on a transparent substrate for OLED or thin film transistor applications. In one embodiment, a method of forming a buffer layer on a surface of a substrate includes providing a substrate having an planarization material disposed thereon in a processing chamber, supplying a buffer layer gas mixture including a silicon containing gas into the processing chamber, controlling a substrate temperature less than about 100 degrees Celsius, forming a buffer layer on the planarization material, supplying an encapsulating barrier layer deposition gas mixture including a silicon containing gas and a nitrogen containing gas into the processing chamber, and forming an encapsulating barrier layer on the buffer layer.