Micro-transfer Printing Stamp With Segmented Elastomeric Posts
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Solution Overview
Problem
Existing micro-transfer printing technologies face challenges in developing highly reliable and easy-to-use stamp structures for efficiently transferring small, active components from one substrate to another, particularly in achieving precise adhesion and alignment without requiring careful alignment of the stamp and substrate.
Innovation Solution
The development of a micro-transfer structure comprising a stamp with a rigid support, a bulk layer, and posts where components are adhered to two or more posts, with the bulk layer and posts being made of elastomeric materials like polydimethylsiloxane, allowing for flexible adhesion and transfer configurations, including a flipped configuration, using a motion platform for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional stamp structure is used for micro-transfer printing, then the transfer process requires careful alignment between stamp and substrate, but this increases the complexity and difficulty of the operation
Solution Approach 1:
The stamp structure is segmented into a rigid support and separate posts that are disposed on the rigid support. Each post can independently contact and adhere components, allowing the stamp to accommodate alignment variations while maintaining reliable transfer. The segmentation enables the posts to self-align with components on the substrate without requiring precise overall stamp-substrate alignment.
Solution Approach 2:
The patent employs elastomeric material for the posts, which changes the mechanical parameters of the stamp structure. The elastomeric properties allow the posts to deform and adapt to slight misalignments between the stamp and substrate, thereby reducing alignment requirements while maintaining reliable component transfer.
2Reliability
If components are adhered to multiple posts, then adhesion reliability is improved, but the device complexity increases
Solution Approach 1:
The posts are designed with universal functionality, where each post serves multiple purposes: providing adhesion for components, enabling alignment tolerance, and facilitating transfer. The regular array configuration and identical structure of posts allow them to universally contact and adhere components at multiple locations, improving adhesion reliability without requiring complex differential structures.
3Stability of the object's composition
If a rigid support structure is used for the stamp, then structural stability is improved, but flexibility in adhesion and transfer configurations is reduced
Solution Approach 1:
The stamp is constructed as a composite structure combining a rigid support with elastomeric posts. The rigid support provides structural stability and maintains the overall geometry of the stamp, while the elastomeric posts provide flexibility and adaptability in adhesion configurations. This composite design allows the stamp to maintain structural integrity while accommodating various transfer configurations including flipped configurations.
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 solution enables efficient and precise micro-transfer printing of components from a source wafer to a target substrate, allowing for flexible adhesion and alignment, reducing the need for careful alignment and improving the reliability of the transfer process, especially in flipped configurations.
Implementation Method 1
The bulk layer and posts can be elastomeric (e.g., comprise or consist essentially of polydimethylsiloxane)
Implementation Method 2
Components are adhered to (e.g., disposed in contact with) some but not all of the posts
Data Source
AI summary
A micro-transfer structure comprises a stamp comprising a rigid support, only a single contiguous bulk layer disposed on the rigid support, and posts disposed on the bulk layer. Components are adhered to (e.g., disposed in contact with) some but not all of the posts. The posts can be substantially identical and disposed in a regular array on the bulk layer. Each component is adhered to (e.g., in contact with) two or more posts. Components can be disposed on a source wafer entirely over sacrificial portions of a sacrificial layer on or in the source wafer and attached to anchors disposed between sacrificial portions with a tether.