Transfer Head Adhesive Layer Etching for High-Aspect-Ratio Stamps
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Solution Overview
Problem
The existing manufacturing method for PDMS stamps using sapphire base plates results in insufficient depth-to-width ratio and rough surfaces, leading to poor adhesion and inadequate device transfer performance due to the difficulty in etching sapphire and the roughness of etched grooves.
Innovation Solution
A manufacturing method involving an elastic adhesive layer on a substrate with a reticle having hollow areas, where the adhesive layer is etched through the reticle to form a transfer component with a greater depth-to-width ratio and smoother surfaces, using a reticle sacrificial layer to facilitate easy removal without damaging the component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sapphire base plate is used to form the mold by etching, then the PDMS stamp can be manufactured, but the etch depth is small resulting in insufficient depth-to-width ratio
Solution Approach 1:
The patent uses a mold made from a different material (not sapphire) that can be easily etched to achieve the desired deep groove structure. This mold is then used to copy the pattern onto the PDMS stamp, achieving the required depth-to-width ratio without the difficulty of etching sapphire directly
Solution Approach 2:
The patent changes the material parameter of the base plate from sapphire to a more etchable material, enabling sufficient etch depth to achieve the required depth-to-width ratio for the PDMS stamp while maintaining ease of manufacture
2Manufacturing precision
If sapphire base plate is etched to form grooves, then the mold can be created, but the groove surfaces become rough resulting in poor adhesion
Solution Approach 1:
The patent creates a master mold with smooth groove surfaces using a material that allows for high-quality surface finishing. This mold is then used to replicate the pattern onto the PDMS stamp, transferring the smooth surface quality without requiring direct etching of the final stamp material
Solution Approach 2:
The patent uses a disposable or sacrificial mold layer that can be easily manufactured with smooth surfaces and then removed or reused, avoiding the need for complex and costly processes to achieve smooth surfaces on the final PDMS stamp
3Productivity
If injection molding is used to manufacture PDMS stamp, then the stamp can be produced, but the process is complex and time-consuming
Solution Approach 1:
The patent extracts or removes the complex injection molding step from the manufacturing process, replacing it with a simpler direct etching or deposition method that achieves the same result more efficiently
Solution Approach 2:
The patent performs preliminary preparation of the substrate or adhesive layer before the final stamp formation, allowing the main manufacturing step to be simpler and faster, thereby improving overall productivity while reducing 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 method produces a transfer component with improved adhesion and transfer performance, reducing production difficulties and costs by avoiding the need to remove molds, and enhancing the efficiency and yield of device mass transfer.
Implementation Method 1
The elastic adhesive layer is etched through the hollow area of the reticle
Data Source
AI summary
A transfer component and a manufacturing method thereof, and a transfer head are provided in the disclosure. The method includes the following. An elastic adhesive layer is disposed on a surface of a substrate. A reticle with a hollow area is disposed on the elastic adhesive layer. The elastic adhesive layer is etched through the hollow area of the reticle.