Conductive Barrier Crackstop for Semiconductor Reliability
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Solution Overview
Problem
Advanced semiconductor devices face issues with crack propagation and moisture ingress due to ineffective barriers that fail to conduct electrical signals, leading to device damage and increased costs from expensive packaging solutions.
Innovation Solution
A conductive barrier structure with a serpentine pattern and junctions that allows signal transmission while preventing crack propagation, fabricated using techniques like photolithography and etching, which embeds a conductive path to link internal and external circuitry, thereby enhancing device interconnections and reducing assembly costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier structure is implemented to prevent crack propagation and moisture ingress, then device reliability is improved, but the barrier cannot conduct electrical signals for testing and communication
Solution Approach 1:
The barrier structure merges two previously separate functions into a single integrated component: (1) protection function through crackstop layers and die seal, and (2) electrical signal conduction through embedded conductive pathways. This allows the barrier to simultaneously prevent crack propagation while enabling signal transmission for testing and communication.
Solution Approach 2:
The barrier structure achieves multi-functionality by incorporating conductive pathways within the die seal and crackstop layers, enabling it to perform multiple roles: mechanical protection against cracks, moisture barrier, and electrical signal transmission medium. This eliminates the need for separate protective and conductive structures.
2Ease of operation
If conductive barriers are used to enable signal transmission, then signal conduction is improved, but cracks and moisture can traverse through the conductor into protected regions
Solution Approach 1:
The conductive barrier is segmented into discrete conductive pathways embedded within the die seal and crackstop layers. These segmented conductors are strategically positioned to allow signal transmission while maintaining the protective barrier integrity, preventing cracks and moisture from traversing through the conductor material itself.
Solution Approach 2:
The die seal and crackstop layers act as intermediary protective structures that surround and protect the conductive pathways. These intermediary layers ensure that while signals can conduct through the embedded conductors, cracks and moisture are blocked by the surrounding protective barrier material.
3Reliability
If conventional barriers are implemented to protect active areas, then crack propagation is suppressed, but expensive packaging solutions are required to enable device interconnections
Solution Approach 1:
The invention merges the protective barrier function with the electrical interconnection function by embedding conductive pathways directly within the die seal and crackstop structures. This integration eliminates the need for expensive external packaging solutions that would otherwise be required to provide both protection and electrical connectivity.
Data Source
AI summary
A barrier or “crackstop” that is configured to conduct electrical signals. These configurations may form a wall around integrated, active circuitry of a semiconductor die. This wall may include a conductor that follows a three-dimensional pathway from one side to the other side of the wall. This pathway may have sections that overlap, or double-back, so that portions of the conductor overlap along their individual length. These sections prevent crack propagation internal to the wall.