Oxide-Infused Silicon Support Structure for UV Curing
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Solution Overview
Problem
In semiconductor fabrication, the shrinkage of low-k dielectric layers during UV curing processes leads to separation of barrier layers from conductive structures, resulting in performance and reliability degradation of the conductive structures.
Innovation Solution
A support structure comprising an oxide-infused silicon layer is formed within a trench between the low-k layer and the barrier layer, providing pressure to maintain contact between the barrier layer and the conductive structure during UV curing, thereby preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If UV curing process is used to strengthen the low-k layer, then the low-k layer strength is improved, but the low-k layer shrinks causing barrier layer separation from conductive structure
Solution Approach 1:
A support structure is formed at the interface between the low-k layer and conductive structure before UV curing. This support structure preemptively counteracts the shrinkage-induced separation that will occur during UV curing, maintaining barrier layer contact with the conductive structure despite the low-k layer's contraction.
Solution Approach 2:
The support structure acts as an intermediary element positioned between the low-k layer and the conductive structure. During UV curing, this intermediary component absorbs or compensates for the shrinkage forces, preventing direct separation between the barrier layer and conductive structure while allowing the low-k layer to be strengthened.
2Reliability
If low-k layer shrinkage is prevented, then barrier layer separation is reduced, but UV curing process cannot be performed
Solution Approach 1:
The support structure is formed in advance to preemptively counteract shrinkage effects, enabling the UV curing process to proceed without causing harmful separation. The support structure is specifically designed to withstand or compensate for the shrinkage forces that will be generated during curing.
Solution Approach 2:
The support structure modifies the mechanical parameters of the system by providing structural reinforcement at the critical interface. This changes the shrinkage behavior or stress distribution during UV curing, allowing the process to be performed while maintaining barrier layer contact.
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 support structure enhances the performance and reliability of the conductive structure by maintaining contact between the barrier layer and the conductive structure, reducing the likelihood of separation and ensuring consistent operation.
Implementation Method 1
The support structure is configured to provide pressure against the barrier layer so that the barrier layer substantially maintains in contact with the conductive structure
Data Source
AI summary
Among other things, one or more support structures and techniques for forming such support structures within semiconductor devices are provided. The support structure comprises an oxide infused silicon layer that is formed within a trench of a dielectric layer on a substrate of a semiconductor device. The oxide infused silicon layer results from a silicon layer that is exposed to oxide during an ultraviolet (UV) curing process. The oxide infused silicon layer is configured to support a barrier layer against a conductive structure formed on the barrier layer within the trench. In this way, the support structure provides pressure against the barrier layer so that the barrier layer substantially maintains contact with the conductive structure, to promote improved performance and reliability of the conductive structure.