Polyimide Thin Film Fabrication on Ceramic Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for forming polyimide thin films on large-scale, heavy ceramic substrates are inefficient due to the limitations of the spin-coating method, which struggles with achieving uniform films and is not suitable for high-speed rotation, leading to signal loss and reliability issues in RF areas and high-temperature, high-moisture conditions.
Innovation Solution
A method involving a metal mask with holes is used to inject polyimide resin onto the ceramic substrate, allowing for the formation of a polyimide thin film through a simpler process, with adjustable thickness and area coverage, and incorporating mechanical and chemical planarization for smoothness, using nickel or silver masks with low reactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spin-coating method is used to form polyimide thin films on large-scale ceramic substrates, then the film formation process is simple, but the film uniformity deteriorates and the method becomes unsuitable for high-speed rotation
Solution Approach 1:
The metal mask is divided into multiple holes arranged in a specific pattern, allowing the polyimide resin to be deposited through multiple discrete locations. This segmentation enables controlled resin distribution across the substrate surface while maintaining simplicity in the overall process
Solution Approach 2:
The metal mask functions as a porous structure with multiple holes, allowing the polyimide resin to pass through and deposit on the substrate. The porous configuration enables uniform distribution of resin across the substrate surface while maintaining process simplicity
2Ease of manufacture
If the spin-coating method is used for large-scale substrates, then the process is straightforward, but the substrate weight and size make high-speed rotation difficult
Solution Approach 1:
The mechanical spin-coating system is replaced with a metal mask-based deposition system. The metal mask is positioned over the substrate and resin is deposited through the mask holes, eliminating the need for high-speed rotation of large, heavy substrates while maintaining process simplicity
Solution Approach 2:
The metal mask serves as an intermediary tool between the resin source and the substrate. The mask with its patterned holes controls resin distribution without requiring direct mechanical interaction with the large substrate, thereby eliminating rotation speed limitations
3Ease of manufacture
If traditional screen printing is used to form polyimide films, then the process is established, but chemical reactions occur between the screen and resin causing reliability issues
Solution Approach 1:
The metal mask is designed as a disposable or reusable component that does not chemically react with the polyimide resin. The mask with its patterned holes is replaced after each use, eliminating the need for chemical compatibility concerns while maintaining process effectiveness
Solution Approach 2:
The metal mask acts as an intermediary that physically controls resin distribution without undergoing chemical reactions with the resin. The non-reactive metal surface allows clean deposition without the chemical interactions that cause reliability issues in traditional screen printing
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
This approach enables the formation of a reliable polyimide thin film with excellent heat and chemical stability on large-scale ceramic substrates, reducing fabrication costs and time while maintaining high reliability, and avoiding the drawbacks of traditional screen printing reactions.
Implementation Method 1
the polyimide resin may be applied to the ceramic substrate and leveled to form a polyimide film
Implementation Method 2
The method may further include: polarizing the polyimide film through a mechanical method, a chemical method, or a mechanical and a chemical method
Data Source
AI summary
A method for fabricating a ceramic substrate includes: preparing a ceramic substrate; disposing a metal mask having a plurality of holes at an upper side of the ceramic substrate; and injecting a polyimide resin into the holes of the metal mask to form a polyimide thin film on the ceramic substrate. A thin film is formed on a ceramic substrate in a simpler manner, so the fabrication cost can be reduced and a fixed time can be shortened, thus increasing the efficiency of a product.