Printed Electronics Fabrication via Substrate Thermal Shrinkage
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Solution Overview
Problem
Conventional direct-write technologies face challenges in producing printed electrical and optical components with properties equivalent to bulk materials due to residual porosity and organic additives, which limits conductivity and practicality for industrial production.
Innovation Solution
The method involves printing electrically conductive or insulating materials on a substrate that is stretched and then shrunk by applying heat, using heat-shrinkable materials like polystyrene to consolidate ink particles, reducing porosity and increasing density, thereby enhancing conductivity and reducing component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extended sintering times at high temperatures are used to reduce porosity and increase density, then material properties improve, but productivity decreases and substrate selection is limited
Solution Approach 1:
The invention changes the processing parameters by using lower temperatures (below 200°C) combined with stretching and shrinking operations, replacing the conventional high-temperature extended sintering process. This parameter change achieves comparable or superior material properties while dramatically reducing processing time from hours to minutes, thereby resolving the contradiction between reliability improvement and productivity maintenance.
Solution Approach 2:
The invention applies preliminary stretching to the substrate before printing, which pre-configures the substrate to undergo controlled shrinkage during the printing process. This preliminary action enables the ink particles to be naturally consolidated into dense structures without requiring extended high-temperature sintering, thus improving productivity while maintaining material properties.
2Ease of manufacture
If conventional direct-write printing is used, then manufacturing simplicity is maintained, but printed component conductivity is substantially less than bulk material
Solution Approach 1:
The substrate is pre-stretched before printing, creating a controlled state that enables subsequent shrinkage to consolidate ink particles. This preliminary action transforms the simple printing process into one that naturally produces dense, high-conductivity traces without complex post-processing, resolving the contradiction between manufacturing simplicity and electrical conductivity.
Solution Approach 2:
The invention utilizes thermal shrinkage of the pre-stretched substrate to compress and consolidate the printed ink particles. The substrate's thermal response (shrinking upon heating) is harnessed to increase ink particle density and eliminate porosity, thereby achieving bulk-material-equivalent conductivity while maintaining ease of manufacture through a single integrated process.
3Reliability
If high-temperature sintering is applied to improve conductivity, then porosity is reduced, but organic additives remain and substrate choice is limited
Solution Approach 1:
The invention fundamentally changes the processing parameters from high-temperature sintering (>300°C) to low-temperature stretching and shrinking (<200°C). This parameter change enables the use of temperature-sensitive substrates such as plastics and polymers that would decompose at high temperatures, thereby expanding substrate selection while achieving comparable conductivity improvement through mechanical consolidation rather than thermal sintering.
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 results in higher density, more conductive, and smaller-sized printed components with improved durability, enabling the fabrication of more devices per unit area with superior performance compared to conventional methods.
Implementation Method 1
shrinking the substrate to a target size. The step of shrinking includes stretching the substrate during printing by an applied potential or tension and releasing the potential or tension force when printing is completed... The step of shrinking can include heating the substrate at a predetermined temperature based on properties of the substrate
Implementation Method 2
The step of shrinking includes stretching the substrate during printing by an applied potential or tension and releasing the potential or tension force when printing is completed
Data Source
Figure 1
Figure 2a~2c
Figure 3a~3c
AI summary
A method for fabricating printed electronics and optical components includes printing (104) a trace of electrically conductive, semiconductive or insulating material on a substrate and shrinking (106) the substrate to a target size. The material can include an ink, solution, dispersion, powder, slurry, paste or the like. The step of shrinking can include heating the substrate at a predetermined temperature based on properties of the substrate. The step of shrinking can also include heating the substrate for a predetermined duration based on properties of the substrate. The step of shrinking can also include releasing an external electrical potential used to stretch the substrate during printing. For example, the substrate may decrease in area by at least fifty percent during heating.