Conductive Adhesion Layer for High-Temp Substrate Delamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for temporarily bonding and delaminating substrates on carriers, particularly for flexible materials like plastic and thin glass, face challenges in achieving strong yet non-permanent bonding and safe separation at high temperatures, especially during low temperature polysilicon (LTPS) processes.
Innovation Solution
An apparatus and method utilizing an electrically conductive adhesion layer between the substrate and carrier, where a current supply source applies a high voltage to break the adhesive bond, allowing for temporary bonding and delamination without damaging the flexible substrate, using a conductive adhesion layer with temperature resistance and a bulk metal for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strong adhesive bond is used to bond the flexible substrate to the rigid carrier, then bonding strength is improved, but difficulty of separation increases
Solution Approach 1:
A release layer is introduced as an intermediary between the adhesive layer and the flexible substrate. This release layer has controlled adhesion properties that allow strong bonding during processing but enable easy separation when needed. The release layer acts as a mediator that provides temporary strong bonding while maintaining the capability for clean separation without damaging the substrate.
2Strength
If high temperature heating is applied to bond the substrate, then bonding strength is improved, but risk of substrate damage increases
Solution Approach 1:
The bonding process utilizes controlled temperature parameters where the flexible substrate and rigid carrier are heated to a specific temperature range (e.g., 300°C or higher) to activate the adhesive properties of the release layer. After bonding, the temperature is reduced to safe levels before separation, ensuring the substrate is not damaged. This parameter change approach allows strong bonding at high temperature while protecting the substrate during the overall process.
3Strength
If the carrier and substrate are heated to high temperature for bonding, then adhesion is improved, but control of heating uniformity becomes difficult
Solution Approach 1:
The release layer is designed with universal thermal properties that enable it to bond effectively across the entire surface area of the substrate-carrier interface. The layer's composition and structure are optimized to provide uniform adhesion characteristics that facilitate even heat distribution and consistent bonding across large areas, reducing heating uniformity control difficulties.
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 strong temporary bonding and safe delamination of flexible substrates from rigid carriers at high temperatures, ensuring the substrate is not damaged during the process, facilitating processes like LTPS without causing harm to the flexible materials.
Implementation Method 1
applying a current to the electrically conductive adhesion layer to heat the electrically conductive adhesion layer
Data Source
AI summary
An apparatus for temporarily bonding a substrate on a carrier includes an electrically conductive adhesion layer disposed between the carrier and the substrate, and a current supply source configured to apply a current to the electrically conductive adhesion layer.