Through-Via Scallop Profiling for Metal Conductivity Control
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Solution Overview
Problem
As the minimum feature sizes in semiconductor devices continue to decrease, challenges arise in controlling the conductivity of metal layers within through vias, which are essential for maintaining device performance and integration density.
Innovation Solution
The solution involves using a two-step patterning process to form through vias with different scallop depths in their sidewalls. The first patterning process creates first scallops with a specific depth, followed by a second patterning process that forms second scallops with different depths. This approach allows for controlled conductivity of the metal layer in various regions of the through vias without requiring additional deposition and etching steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If minimum feature sizes are reduced to improve integration density, then more components can be integrated into a given area, but controlling the conductivity of metal layers within through vias becomes more difficult
Solution Approach 1:
The patent applies local quality by creating different scallop depths at different locations within the through via sidewalls. The first scallops have a first depth and the second scallops have a second depth that is greater than the first depth. This spatial variation in scallop depth creates localized differences in metal layer conductivity, allowing precise control of electrical properties in specific regions while maintaining high integration density throughout the device.
2Manufacturing precision
If a two-step patterning process is used to form different scallop depths, then conductivity of metal layers can be controlled, but process complexity increases
Solution Approach 1:
The patent segments the patterning process into two distinct steps: a first patterning process that creates initial scallops with a first depth, and a second patterning process that creates additional scallops with a greater second depth. This segmentation allows independent optimization of each patterning step and enables precise control over the final scallop depth profile, achieving superior conductivity control despite the increased process steps.
Solution Approach 2:
The first patterning process performs preliminary action by creating the initial scallops with the first depth before the second patterning process is applied. This preliminary structuring provides a foundation that guides the subsequent patterning step, allowing the second process to build upon and modify the existing structure to achieve the final desired scallop depth profile and conductivity characteristics.
Data Source
AI summary
Some devices included a substrate; and a through via, including a plurality of scallops adjacent the through via in a first region and a plurality of scallops adjacent the through via in a second region, the plurality of scallops having a first depth, the scallops having a greater depth. Some devices include an opening extending into a substrate, including a first region and a second region. Sidewalls of the opening include a stack of first concave portions extending a first distance into the first substrate, and a stack of second concave portions extending a second distance, greater than and parallel to the first distance, into the first substrate. A conductor partially fills the first concave portions and at least partially fills the respective second concave portions.