Encapsulant Barrier for Singulation Contamination Control
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Solution Overview
Problem
The existing methods for singulating integrated circuits, such as sawing along scribe lines, can compromise the integrity of mounted dies by releasing contaminants, leading to increased costs, larger device footprints, and thermal management issues due to potential contamination and heat buildup.
Innovation Solution
A soft encapsulant barrier is deposited along scribe lines to prevent contamination and thermal issues, with a cured encapsulant applied between the barrier and the device edges to protect against environmental factors and reduce the generation of contaminants during the singulation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sawing is used to singulate mounted dies along scribe lines, then the substrate can be separated into individual carriers, but the integrity of mounted dies is compromised due to potential contaminants freed by sawing
Solution Approach 1:
An encapsulant barrier material is introduced as an intermediary layer along the scribe lines between adjacent mounted dies. This barrier prevents contaminant migration from the substrate during sawing operations while allowing the singulation process to proceed, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The encapsulant barrier is deposited along the scribe lines before the sawing operation. This preliminary protective action ensures that when sawing occurs, contaminants are already blocked from reaching the mounted dies, maintaining die integrity while enabling efficient singulation
2Productivity
If sawing operations are performed to separate substrates, then individual carriers can be produced, but thermal management issues arise due to heat buildup
Solution Approach 1:
The encapsulant barrier serves as a thermal management intermediary by providing a controlled interface between the substrate and the encapsulant. This barrier layer helps manage heat distribution during sawing operations, preventing excessive heat buildup while maintaining batch processing productivity
3Object-affected harmful factors
If encapsulant is deposited to protect devices, then environmental protection is achieved, but contamination during singulation cannot be prevented
Solution Approach 1:
The protective system is segmented into two functional components: an encapsulant barrier layer deposited along scribe lines to prevent contaminant migration, and a main encapsulant layer for environmental protection. This segmentation allows each layer to address specific contamination pathways, preventing both environmental factors and singulation-related contaminants from affecting the devices
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 minimizes contamination and heat buildup, reduces production costs, and enhances the yield and efficiency of singulated devices by blocking light leakage and preventing the spread of contaminants, thereby maintaining the integrity and performance of the devices.
Implementation Method 1
blocking light leakage
Implementation Method 2
preventing the spread of contaminants
Data Source
AI summary
In described examples, a device mounted on a substrate includes an encapsulant. In at least one example, an encapsulant barrier is deposited along a scribe line, along which the substrate is singulatable. To encapsulate one or more terminals of the substrate, an encapsulant is deposited between the encapsulant barrier and an edge of the device parallel to the encapsulant barrier.