Multi-Layer Pattern Transfer Printing for Single-Step Feature Alignment
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Solution Overview
Problem
Existing methods struggle to efficiently produce multi-layered features in a single printing process, particularly in photovoltaic cells and semiconductor packaging, due to alignment and material compatibility issues, leading to inefficiencies and increased costs.
Innovation Solution
A pattern transfer method that fills multi-layered stack elements into dents on a source substrate and releases them simultaneously onto a receiving substrate using a laser beam, allowing for the formation of multi-layered features with different material compositions in a single illumination step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-layered features are produced using existing printing methods, then material compatibility and alignment can be achieved, but production efficiency is reduced and costs increase due to multiple printing steps
Solution Approach 1:
The patent combines multiple printing operations into a single printing step by using a multi-layered source substrate with pre-formed dents that contain different printing pastes. The laser illumination simultaneously transfers all layers onto the receiving substrate in one operation, eliminating the need for multiple separate printing steps and their associated alignment procedures.
Solution Approach 2:
The source substrate is pre-prepared with multi-layered printing paste stacks formed in dents before the actual transfer process. This preliminary structuring of multiple materials in vertical stacks allows them to be transferred simultaneously in a single laser illumination step, improving production efficiency while maintaining material compatibility.
2Manufacturing precision
If multi-layered features are produced using existing printing methods, then material compatibility is maintained, but alignment precision deteriorates due to multiple printing steps
Solution Approach 1:
The patent merges multiple printing operations into a single simultaneous transfer process. The multi-layered stack elements are transferred together in one laser illumination step, eliminating cumulative alignment errors that would occur in sequential printing and significantly improving alignment precision.
Solution Approach 2:
The source substrate acts as a master template with pre-formed multi-layered stack elements in dents. This template is copied onto the receiving substrate in a single step, ensuring that the relative positions and alignments of all layers are reproduced accurately without the alignment issues inherent in multiple separate printing operations.
3Adaptability or versatility
If single-layer printing is used, then production cost is reduced, but the ability to produce complex multi-layered features is limited
Solution Approach 1:
The patent transitions from planar single-layer printing to vertical multi-layered stack structures. By organizing printing paste layers in vertical stacks within dents on the source substrate, the system can transfer complex multi-layered features in a single step, effectively adding the vertical dimension to the printing process without increasing operational complexity.
Solution Approach 2:
The invention uses composite multi-layered printing paste stacks containing different materials (e.g., conductive paste, dielectric paste, adhesive paste) arranged in vertical layers. These composite stack elements are transferred simultaneously, enabling the production of complex multi-material features while maintaining a relatively simple single-step printing process.
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
Enables cost-effective and high-throughput production of multi-layered features with improved alignment and material compatibility, reducing production costs and enhancing performance in photovoltaic cells and semiconductor packaging.
Implementation Method 1
Pattern transfer printing (PTPTM) for c-Si solar cell metallization, 5th Workshop on Metallization for Crystalline Silicon Solar Cells, Energy Procedia 67:156-162, which is incorporated herein by reference in its entirety, teaches pattern transfer printing (PTPTM) as a non-contact printing technology for advanced front side metallization of c-Si PV solar cells, which is based on laser-induced deposition from a polymer substrate.
Data Source
AI summary
Pattern transfer source substrates and printing methods are described, providing multi-layer paste stack elements like conductor lines or bumps, so that each stack element is printed on a receiving substrate in a single illumination step. The paste is filled layer-by-layer, possibly having different materials in different layers, with layer thickness controlled by parameters of the filling elements, e.g., in case of blades, the pressure, angle, velocity and flexibility (material) of the blade. Specifically, a bottom layer of the stack may be configured to interface the receiving substrate while one or more top layers may be configured to optimize the quality of the printed features. For example, bottom layers may be configured to bind to the substrate, to modify the substrate and/or provide a barrier from top layer(s) which may not be compatible with the substrate. In case of bumps, different layers may include adhesive and soldering materials.