Flexible OLED Buffer Layer Deposition Contamination Control
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Solution Overview
Problem
High temperature plasma enhanced chemical vapor deposition (PECVD) processes for buffer layers in flexible OLED manufacturing contaminate equipment due to direct plasma bombardment of organic substrates, leading to poor performance and contamination issues.
Innovation Solution
A method involving the deposition of a corrosion-resistant silver metal film layer over the organic substrate, followed by a high temperature PECVD buffer layer and laser crystallization of amorphous silicon to form a polycrystalline semiconductor layer, which prevents direct plasma impact on the substrate and reduces contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature PEVCD process is used to deposit buffer layer, then film quality and barrier performance are improved, but equipment contamination occurs due to plasma bombardment of organic substrate
Solution Approach 1:
An aluminum oxide buffer layer is introduced as an intermediary between the organic substrate and the plasma source during high temperature PEVCD processing. This intermediate buffer layer protects the organic substrate from direct plasma bombardment, preventing carbonization and equipment contamination while still enabling the deposition of high-quality buffer layers with superior barrier performance
Solution Approach 2:
The aluminum oxide buffer layer is deposited beforehand on the organic substrate before subsequent high temperature PEVCD processes. This preliminary action creates a protective barrier that prevents plasma-induced damage to the organic substrate during later manufacturing steps, thereby preventing equipment contamination while maintaining process benefits
2Object-generated harmful factors
If low temperature PEVCD process is used to deposit buffer layer, then equipment contamination is reduced, but film quality and barrier performance deteriorate
Solution Approach 1:
The aluminum oxide buffer layer serves as a mediator that enables the use of high temperature PEVCD processes without directly exposing the organic substrate to plasma. This resolves the contradiction by allowing high temperature processing (which produces high-quality films) while the aluminum oxide intermediary prevents the plasma from contaminating equipment through organic substrate degradation
3Reliability
If thicker silicon oxide or silicon nitride buffer layers are used on organic substrate, then barrier performance is improved, but substrate flexibility and device weight increase
Solution Approach 1:
The invention changes the material parameter of the buffer layer from traditional silicon oxide or silicon nitride to aluminum oxide. This material substitution provides equivalent or superior barrier performance against moisture and oxygen while maintaining thinner film thickness, thereby reducing device weight and preserving substrate flexibility without compromising 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
Enhances the efficiency of flexible OLED panel production by preventing equipment contamination and improving the integrity of the buffer layer, resulting in a more reliable and effective manufacturing process.
Implementation Method 1
depositing the silver metal film layer at room temperature over the organic material substrate using a magnetron sputtering process
Implementation Method 2
depositing a buffer layer over the protective metal layer using a high temperature PEVCD process
Implementation Method 3
performing a laser crystallization treatment on the amorphous silicon thin film, such that the amorphous silicon thin film turns into a polycrystalline silicon thin film
Data Source
AI summary
A method for manufacturing a flexible organic light-emitting diode (OLED) panel and an OLED panel are provided. The method includes providing an organic material substrate, depositing a protective metal layer over the organic material substrate, depositing a buffer layer over the protective metal layer using a high temperature plasma enhanced chemical vapor deposition (PECVD) process, and forming a semiconductor layer over the buffer layer. The protective metal layer prevents a manufacturing process of the buffer layer from contaminating a PECVD cavity and pipe.