Reinforced Composite Stamp for Semiconductor Transfer
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Solution Overview
Problem
Conventional composite stamps for dry transfer printing of micro-scale semiconductor structures face challenges such as short stamp life, thermal contractions, mechanical deformations, lack of adaptability to non-planar surfaces, and uneven contact force distribution, limiting high-yield and accurate printing of micro-scale semiconductors on large substrates.
Innovation Solution
The development of reinforced composite stamps with a thin glass rigid backing and a reinforcement layer that provides vertical flexibility and in-plane rigidity, allowing for uniform pressure distribution and conformal contact with substrates, while minimizing in-plane motion and mechanical deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional composite stamps are used for dry transfer printing, then the stamp structure is simple, but the stamp life is short and mechanical deformations occur
Solution Approach 1:
The patent applies composite materials by combining a rigid support layer (glass or silicon wafer) with a deformable layer (PDMS or elastomer) to create a reinforced composite stamp. This composite structure provides both mechanical stability from the rigid layer and conformability from the deformable layer, resolving the contradiction between stamp life and structural simplicity.
Solution Approach 2:
The stamp is segmented into distinct functional layers: a rigid support layer for structural integrity and a deformable layer for contact conformability. This segmentation allows each layer to perform its specific function optimally, extending stamp life while maintaining manageable complexity through modular design.
2Manufacturing precision
If conventional stamps are used, then the device complexity is low, but manufacturing precision and spatial placement accuracy are poor
Solution Approach 1:
The rigid support layer provides dimensional stability and resistance to thermal contraction, while the deformable layer ensures uniform contact pressure. This composite material approach achieves high manufacturing precision and spatial placement accuracy by combining materials with complementary properties.
Solution Approach 2:
Different regions of the stamp have different properties: the rigid support layer provides overall structural stability for precision, while the deformable layer provides local conformability for accurate pattern transfer. This local differentiation of material properties achieves high manufacturing precision.
3Adaptability or versatility
If conventional stamps are used, then the stamp structure is simple, but adaptability to non-planar surfaces is poor
Solution Approach 1:
The deformable layer (PDMS or elastomer) acts as a flexible shell that can conform to non-planar substrate surfaces. This flexible layer allows the stamp to adapt to varying surface geometries while the rigid support layer maintains overall structural integrity, achieving adaptability without excessive complexity.
Solution Approach 2:
The composite structure combines the rigidity needed for structural support with the flexibility needed for surface adaptability. The rigid support layer provides stability while the deformable layer provides conformability to non-planar surfaces, resolving the contradiction between adaptability and structural simplicity.
4Productivity
If conventional stamps are used, then the stamp area is limited, but productivity for large-area substrates is reduced
Solution Approach 1:
The stamp design with a large rigid support layer provides a stable platform for transferring patterns across large substrate areas. The segmentation into rigid support and deformable printing layers allows the stamp to maintain structural integrity while covering large areas, improving productivity for large-area substrates.
Solution Approach 2:
The composite stamp structure with rigid support provides the mechanical stability needed for large-area transfers, while the deformable layer ensures uniform contact across the entire substrate surface. This combination enables high productivity for large-area substrates without sacrificing contact quality.
5Stability of the object's composition
If conventional stamps are used, then thermal contractions are minimal, but mechanical deformations occur during printing
Solution Approach 1:
The rigid support layer (glass or silicon) provides resistance to thermal contraction and mechanical deformation, while the deformable layer absorbs localized stresses. This composite material approach achieves superior thermal and mechanical stability by combining materials with complementary properties.
Solution Approach 2:
The stamp is segmented into a rigid support layer that resists thermal and mechanical changes, and a deformable layer that accommodates local deformations. This segmentation allows the rigid layer to maintain dimensional stability while the deformable layer handles mechanical flexibility, achieving overall stability.
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 reinforced composite stamps enable high-fidelity and high-yield dry transfer printing of semiconductor structures on large substrates with improved accuracy and reliability, suitable for distributed electronic systems, and extend the stamp's mechanical stability and lifetime.
Implementation Method 1
a deformable layer having an internal surface and an external surface positioned opposite the internal surface, the external surface of the deformable layer having a plurality of relief features
Data Source
AI summary
Provided are reinforced composite stamps, devices and methods of making the reinforced composite stamps disclosed herein. Reinforced composite stamps of certain aspects of the present invention have a composition and architecture optimized for use in printing systems for dry transfer printing of semiconductor structures, and impart excellent control over relative spatial placement accuracy of the semiconductor structures being transferred. In some embodiments, for example, reinforced composite stamps of the present invention allow for precise and repeatable vertical motion of the patterned surface of the printing apparatus with self-leveling of the stamp to the surface of a contacted substrate. Reinforced composite stamps of certain aspect of the present invention achieve a uniform distribution of contact forces between the printing apparatus patterned surface and the top surface of a substrate being contacted by the reinforced composite stamp of the printing apparatus.