Integrated IC Singulation System for Wafer Dicing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current integrated circuit singulation techniques, such as mechanical cutting and laser dicing, face issues like chipping, cracking, silicon dust production, corrosion, and localized heating defects, which lead to device failures and inefficiencies in high-throughput production.
Innovation Solution
An integrated system that combines mechanical and laser cutting for scribing and dicing, allowing for sequential or simultaneous use of both methods to reduce stress and improve cutting efficiency, with an in-line dicing machine design to manage the processes effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical cutting is used to singulate chips from wafer, then cutting efficiency is improved, but chipping, cracking, silicon dust production and corrosion increase
Solution Approach 1:
The cutting process is divided into two distinct stages: scribing (partial cut) and dicing (complete cut). This segmentation allows each stage to be optimized independently, with scribing creating a controlled partial cut that reduces stress concentration and prevents excessive chipping and cracking during the subsequent dicing stage.
Solution Approach 2:
The scribing step performs a preliminary partial cut before the final dicing operation. This preliminary action creates a controlled fracture line that guides the subsequent complete cut, reducing the harmful effects of direct full-depth mechanical cutting such as chipping, cracking, and silicon dust generation.
2Object-generated harmful factors
If laser dicing is used to singulate chips from wafer, then localized heating defects are reduced, but processing speed decreases for thick wafers
Solution Approach 1:
The laser cutting process is segmented into multiple passes rather than attempting to cut through the entire wafer thickness in a single pass. This allows the laser to remove material in controlled increments, preventing excessive localized heating and melting while maintaining reasonable processing speeds for thick wafers.
Solution Approach 2:
The laser operates in periodic pulses rather than continuous mode, allowing cooling intervals between pulses. This periodic action prevents excessive heat accumulation and localized heating defects while still achieving efficient cutting of thick wafers through repeated cycles.
3Manufacturing precision
If 90-100% cut through technique is used in mechanical cutting, then singulation completeness is improved, but chipping and cracking increase
Solution Approach 1:
The singulation process is segmented into scribing (creating a partial cut to a controlled depth) and dicing (completing the cut). This ensures complete singulation while the controlled depth of the scribe line prevents stress concentration that would cause chipping and cracking during the final separation.
Solution Approach 2:
The scribing step performs a preliminary partial cut that creates a controlled fracture path. This preliminary action ensures that the subsequent dicing operation will achieve complete singulation while following a pre-established path that minimizes stress concentration and prevents chipping and cracking.
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 reduces wafer handling risks, increases processing speed, and decreases defects like cracks and chips, resulting in higher productivity and cost efficiency by improving the quality of die separation.
Implementation Method 1
scribing a substrate using mechanical cutting or a plurality of passes of laser cutting, and dicing the substrate using mechanical cutting or laser cutting
Implementation Method 2
scribing a substrate using mechanical cutting or a plurality of passes of laser cutting, and dicing the substrate using mechanical cutting or laser cutting
Data Source
AI summary
An integrated, integrated circuit singulation system is provided including scribing a substrate using mechanical cutting or a plurality of passes of laser cutting, and dicing the substrate using mechanical cutting or laser cutting.