Dual-Sided Flexible Substrate Bonding for Carrier Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for manufacturing flexible electronics face challenges in increasing output without compromising device efficiency, particularly due to stress and thermal expansion differences between flexible substrates and carrier substrates, leading to issues like bowing and blistering during processing.
Innovation Solution
A method involving bonding flexible substrates to both sides of a carrier substrate using adhesives that can withstand various processing conditions, including photolithography and thermal vacuum, while minimizing stress through CTE matching and using a dual substrate assembly to stabilize the flexible substrates during fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If flexible substrates are processed without bonding to carrier substrates, then device flexibility is maintained, but manufacturing precision and stability deteriorate due to substrate bowing and distortion
Solution Approach 1:
A carrier substrate is introduced as an intermediary support structure during the fabrication process. The flexible substrate is bonded to the carrier substrate, which provides mechanical support and maintains flatness during processing. After fabrication, the flexible substrate is released from the carrier, achieving both manufacturing precision and device flexibility.
2Manufacturing precision
If flexible substrates are bonded to carrier substrates, then manufacturing precision improves, but stress and thermal expansion differences cause bowing and blistering
Solution Approach 1:
The adhesive layer thickness is optimized to balance mechanical support and stress accommodation. A thin adhesive layer (e.g., 1-10 micrometers) provides sufficient bonding while minimizing stress accumulation from CTE mismatch. Additionally, adhesive materials with appropriate mechanical properties (modulus, elongation) are selected to accommodate thermal expansion differences between the flexible substrate and carrier substrate.
3Productivity
If traditional rigid wafer fabrication methods are used, then manufacturing precision is high, but productivity is limited by sequential processing
Solution Approach 1:
Multiple flexible substrates are bonded to both sides of a single carrier substrate, creating a multi-layer assembly. This allows simultaneous fabrication of multiple devices using the same processing equipment and parameters, significantly increasing productivity while maintaining the high manufacturing precision of rigid wafer methods through the stabilizing effect of the carrier substrate.
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 enables high-yield manufacturing of flexible electronics with minimal distortion and efficient electronic device performance, comparable to traditional rigid silicon wafers, and allows for the production of flexible devices like electrophoretic displays and thin-film transistors with low hysteresis and high drive current.
Implementation Method 1
bonding flexible substrates to both sides of a carrier substrate using adhesives that can withstand various processing conditions
Implementation Method 2
minimizing stress through CTE matching and using a dual substrate assembly to stabilize the flexible substrates during fabrication
Data Source
AI summary
Some embodiments can include a method of manufacturing first electronic device(s) and second electronic device(s), the method including: providing a carrier substrate having a first side and a second side, a first substrate bonded to the first side of the carrier substrate, and a second substrate bonded to the second side of the carrier substrate; depositing at least one layer of a first material over the first substrate while the first substrate is bonded to the first side of the carrier substrate to create a portion of the first electronic device(s); and depositing at least one layer of a second material over the second substrate while the second substrate is bonded to the second side of the carrier substrate to create a portion of the second electronic device(s). In many embodiments, the first substrate and/or the second substrate includes a flexible substrate. Other related systems and methods are also disclosed.