Donor Substrate Fabrication With Waiting Period to Prevent Cracks
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Solution Overview
Problem
Existing donor substrate fabrication processes often result in quality defects such as cracks in multi-layer substrates like POIs or SOIs, leading to production scrap and reduced yield.
Innovation Solution
A process for fabricating a donor substrate that involves attaching a target substrate to a handle substrate using a photo-polymerizable adhesive layer, followed by a predetermined waiting period before rectifying the target substrate, which enhances the robustness and reduces mechanical stresses during subsequent processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a photo-polymerizable adhesive layer is used to attach the target substrate to the handle substrate, then high-temperature fabricating steps are avoided and substrate curvatures are reduced, but quality defects such as cracks still occur in the produced multi-layer substrates
Solution Approach 1:
The patent applies preliminary action by implementing a waiting period of a predetermined duration between the attachment step (C) and the rectification step (D). This waiting period allows the adhesive layer to fully cure and the bonded structure to stabilize before undergoing mechanical rectification, thereby preventing cracks while maintaining the low-temperature advantage of photo-polymerizable adhesives.
2Loss of time
If the target substrate is rectified immediately after attachment to the handle substrate, then production time is reduced, but cracks and other quality defects occur in the donor substrate
Solution Approach 1:
The patent introduces a waiting period as a preliminary action before rectification. This period allows the adhesive-bonded structure to stabilize and gain sufficient mechanical strength, ensuring that subsequent rectification does not induce cracks. The waiting period is predetermined and optimized to balance production time with defect reduction.
3Reliability
If a waiting period is introduced between attachment and rectification steps, then the occurrence of cracks is significantly reduced, but the production cycle time increases
Solution Approach 1:
The patent optimizes the waiting period duration as a critical parameter. By determining the predetermined duration based on the thickness and properties of the adhesive layer, the process achieves the minimum necessary stabilization time to prevent cracks while minimizing the impact on production cycle time. This parameter optimization balances reliability improvement with productivity maintenance.
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 implementation of a waiting period significantly reduces the occurrence of cracks in multi-layer substrates, thereby increasing the production quality and allowing for the reuse of donor substrates, ultimately leading to higher yields and reduced scrap rates.
Implementation Method 1
bonding by way of an adhesive layer, the adhesive layer being a layer of a photo-polymerizable material
Data Source
AI summary
A method for fabricating a donor substrate comprises the steps of A: providing a handle substrate, B: providing a target substrate, C: attaching the target substrate to the handle substrate, and D: rectifying, in particular, by grinding, the target substrate attached to the handle substrate, so as to form the donor substrate, the method being characterized in that a waiting time period of a predetermined duration is observed between step C and step D.