Redistribution Layer Contact Layouts for Void-Free IC Bonding
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Solution Overview
Problem
As semiconductor fabrication processes advance, challenges arise in preventing air pockets from forming between integrated circuit components during bonding, which can lead to discontinuities and degrade device performance.
Innovation Solution
The use of redistribution layers with arrays of conductive contacts configured to allow a bonding wave to displace air, minimizing voids between these layers during bonding by optimizing the layout and arrangement of conductive contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding processes are used, then bonding speed is maintained, but air pockets form between integrated circuit components
Solution Approach 1:
The bonding interface is segmented into multiple regions with varying contact densities. The redistribution layer layout includes dense contact regions and sparse contact regions, creating pathways that facilitate air evacuation during bonding while maintaining reliable electrical connections where needed.
Solution Approach 2:
The problem transitions from a two-dimensional bonding surface to a three-dimensional air displacement pathway. By strategically positioning contacts at different locations and orientations, the layout creates air evacuation channels that extend through the bonding interface, allowing air to escape in multiple directions rather than being trapped in pockets.
2Reliability
If contact density is increased to improve electrical coupling, then electrical performance improves, but air pocket formation increases
Solution Approach 1:
Different regions of the redistribution layer are assigned different contact densities based on local requirements. Areas requiring strong electrical coupling have higher contact density, while areas serving as air evacuation pathways have lower contact density. This local optimization allows the design to simultaneously achieve excellent electrical performance and effective air displacement.
Solution Approach 2:
The redistribution layer layout acts as an intermediary structure that mediates between the conflicting requirements of electrical coupling and air displacement. By carefully designing the contact pattern, it provides both electrical connection pathways and air evacuation pathways, resolving the contradiction between these two functions.
3Reliability
If bonding pressure is increased to eliminate air pockets, then bonding quality improves, but manufacturing complexity increases
Solution Approach 1:
The redistribution layer layout is designed in advance to incorporate air evacuation pathways before the bonding process begins. This preliminary design of the contact pattern eliminates the need for complex real-time control of bonding pressure and air displacement, simplifying the manufacturing process while ensuring high bonding quality.
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 configuration ensures a void-free bonding interface, enhancing the electrical and mechanical coupling between integrated circuit components and improving the performance and reliability of semiconductor devices.
Implementation Method 1
configured and arranged to allow a bonding wave to displace air between the redistribution layers during bonding
Data Source
AI summary
Exemplary embodiments for redistribution layers of integrated circuit components are disclosed. The redistribution layers of integrated circuit components of the present disclosure include one or more arrays of conductive contacts that are configured and arranged to allow a bonding wave to displace air between the redistribution layers during bonding. This configuration and arrangement of the one or more arrays minimize discontinuities, such as pockets of air to provide an example, between the redistribution layers during the bonding.