Flexible Conductor Geometry for Stretchable Electronics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible substrates in electronic devices face challenges in maintaining layer integrity during flexing due to stress from thickness mismatch, thermal expansion, humidity, and pressure changes, leading to conductor breakage and reduced device lifespan.
Innovation Solution
A novel conductor geometry with a periodic structure of islands and repeating geometric features is formed, allowing the conductors to stretch instead of break when bent, using methods such as chemical vapor deposition and physical vapor deposition, and incorporating a release layer to facilitate flexibility without adhering to the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conductor thickness is increased to prevent breakage during flexing, then conductor strength is improved, but metal consumption increases significantly and production cost increases
Solution Approach 1:
The conductor is segmented into a periodic structure of islands rather than a continuous thick layer. This segmentation allows the conductor to flex without breaking while using significantly less metal material, resolving the contradiction between strength and metal consumption.
Solution Approach 2:
The conductor transitions from a two-dimensional continuous layer to a three-dimensional periodic island structure. This dimensional change enables the conductor to accommodate flexing stresses through vertical displacement and geometric deformation, maintaining strength while reducing material usage.
2Strength
If conductor thickness is increased to prevent breakage, then conductor strength is improved, but line placement accuracy decreases
Solution Approach 1:
By segmenting the conductor into periodic islands, the structure achieves sufficient mechanical strength without requiring thick continuous layers that are difficult to place accurately. The segmented geometry allows for better control during fabrication processes.
Solution Approach 2:
The conductor geometry parameters are changed from continuous thick layers to periodic island structures with optimized dimensions. This parameter change enables both adequate strength and improved manufacturing precision through better process control.
3Strength
If conductor thickness is increased to prevent breakage, then conductor strength is improved, but processing time increases
Solution Approach 1:
The periodic island structure can be fabricated more quickly than thick continuous conductors because it allows for thinner material deposition and faster processing cycles while maintaining adequate strength through geometric design rather than material volume.
Solution Approach 2:
Changing the conductor from thick continuous geometry to thin periodic islands allows for reduced processing times in deposition, patterning, and curing operations, while the optimized island parameters maintain the required mechanical strength.
4Strength
If conductor thickness is increased to prevent breakage, then conductor strength is improved, but topography control deteriorates
Solution Approach 1:
The periodic island structure creates a controlled topography with defined geometric features rather than unwanted irregularities. The segmentation allows for better surface planarity and more predictable topographic characteristics that facilitate subsequent processing steps.
Solution Approach 2:
The conductor geometry parameters are optimized to achieve desired topographic characteristics. The periodic island structure with controlled dimensions provides superior topography control compared to thick continuous conductors, enabling better surface flatness and defined feature geometry.
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 conductors are less susceptible to breakage under stress, maintaining functionality and extending the lifespan of flexible electronic devices by allowing them to flex without cracking.
Implementation Method 1
the geometric features of the conductor are adapted to stretch the conductor rather than break the conductor when the conductor is bent
Implementation Method 2
using methods such as chemical vapor deposition and physical vapor deposition
Implementation Method 3
using methods such as chemical vapor deposition and physical vapor deposition
Data Source
AI summary
A flexible conductor formed on a flexible substrate. In one embodiment, a semiconductor device is disclosed. The semiconductor device comprises a periodic structure of islands and at least one conductor. The at least one conductor comprises a series of repeating geometric features affixed to the periodic structure of islands. The geometric features of the conductor are adapted to stretch the conductor rather than break the conductor when the substrate is bent.