Stretchable Electronics Fluid Containment Strain Decoupling
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Solution Overview
Problem
Flexible electronic devices face challenges in achieving high performance due to limitations in stretchability, electrical properties, and manufacturing processes, particularly in maintaining conductivity and reliability under deformation, which restricts their applications in conformable and wearable technologies.
Innovation Solution
The development of electronic systems with fluid containment chambers that decouple forces from the substrate, allowing electronic devices or components to be partially or fully immersed in containment fluids, which reduces strain and enhances mechanical and electrical performance, enabling stretchability and reliability in various configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electronic devices are directly bonded to flexible substrates, then mechanical integration is achieved, but strain from substrate deformation damages the electronic devices
Solution Approach 1:
The device is segmented into a substrate portion and a functional component portion separated by a release interface. The functional component can be detached from the substrate, allowing the substrate to deform without transmitting strain to the electronic device, thus maintaining device integrity while enabling flexible substrate integration.
Solution Approach 2:
The functional electronic component is extracted from the substrate by breaking the adhesion at the release interface. This separation allows the substrate to undergo deformation independently while the electronic component remains strain-free, resolving the contradiction between mechanical integration and strain protection.
2Reliability
If conventional high temperature processing is used for inorganic semiconductors, then electronic performance is improved, but the plastic substrate melts or decomposes
Solution Approach 1:
The system is divided into a low-temperature plastic substrate and a high-performance inorganic semiconductor component processed separately at high temperatures. The inorganic component achieves superior electronic performance through high-temperature processing, then is integrated with the substrate at low temperatures via adhesion layers, resolving the thermal compatibility contradiction.
Solution Approach 2:
An adhesion interface or intermediate layer is introduced between the plastic substrate and inorganic semiconductor. This intermediary allows the inorganic component to be processed at high temperatures independently while protecting the substrate from thermal damage during processing, and enables subsequent low-temperature integration.
3Adaptability or versatility
If conductive rubber is used for stretchable interconnects, then elasticity is achieved, but electrical resistivity is high and conductivity changes under stretching
Solution Approach 1:
The interconnect system is segmented into a flexible substrate that provides elasticity and a separate conductive trace layer that maintains electrical stability. The conductive traces are designed with geometric patterns (such as serpentine or mesh configurations) that allow them to accommodate substrate stretching while maintaining continuous electrical pathways, thus achieving both elasticity and conductivity stability.
Solution Approach 2:
The geometry and configuration of the conductive traces are modified to change their mechanical response. By designing traces with specific patterns, widths, and layouts, the interconnect can undergo large deformations with minimal resistance change, transforming the rigid conductive material into a stretchable system that maintains electrical stability.
4Ease of manufacture
If flexible electronic devices are made with solution processable materials, then low cost fabrication is achieved, but electronic performance is limited compared to inorganic semiconductors
Solution Approach 1:
The system merges solution-processable organic materials for the substrate and low-cost fabrication with separately processed inorganic semiconductor components that provide high electronic performance. The inorganic components are manufactured using conventional high-performance processes, then integrated with the low-cost organic substrate through adhesion interfaces, achieving both cost-effectiveness and high performance.
Data Source
AI summary
The present invention provides electronic systems, including device arrays, comprising functional device(s) and/or device component(s) at least partially enclosed via one or more fluid containment chambers, such that the device(s) and/or device component(s) are at least partially, and optionally entirely, immersed in a containment fluid. Useful containment fluids for use in fluid containment chambers of electronic devices of the invention include lubricants, electrolytes and/or electronically resistive fluids. In some embodiments, for example, electronic systems of the invention comprise one or more electronic devices and/or device components provided in free-standing and/or tethered configurations that decouple forces originating upon deformation, stretching or compression of a supporting substrate from the free standing or tethered device or device component.