Blocking Layer Structure for Semiconductor Dishing Recess Isolation
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Solution Overview
Problem
Dishing recesses in semiconductor devices can lead to unintended electrical shorts between conductive structures, resulting in reduced device performance, malfunction, or circuit damage.
Innovation Solution
Incorporating a blocking layer made of dielectric material to fill the dishing recesses, which mitigates the risk of short circuits and enhances breakdown voltage, thereby improving reliability and manufacturing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking layer is added to fill dishing recesses, then reliability and breakdown voltage are improved, but device structure and fabrication complexity increase
Solution Approach 1:
The blocking layer is formed prior to subsequent processing steps to prevent dishing recess formation before it occurs. By proactively addressing the dishing issue at an early stage in the fabrication process, the structure is protected from developing defects that would require more complex remediation later.
Solution Approach 2:
The blocking layer acts as an intermediary element between the connection line and the dishing recess. This intermediate layer fills the recess and provides a stable interface, preventing direct contact between conductive structures that would otherwise create short circuits.
2Reliability
If a blocking layer is added to fill dishing recesses, then breakdown voltage is enhanced, but manufacturing process complexity increases
Solution Approach 1:
The blocking layer serves multiple functions simultaneously: it fills the dishing recess, provides electrical isolation to enhance breakdown voltage, and creates a planarized surface for subsequent processing steps. This multi-functionality reduces the need for additional separate process steps.
Solution Approach 2:
The dielectric material properties of the blocking layer are specifically selected and controlled to achieve the desired breakdown voltage enhancement. By adjusting the material parameters (dielectric constant, thickness, composition), the breakdown voltage is optimized without requiring complex process modifications.
3Manufacturing precision
If connection line width is increased in edge region, then dishing recess formation is reduced, but device geometry complexity increases
Solution Approach 1:
The connection line width is selectively increased only in the edge region where dishing recesses are most problematic, while maintaining the original width in the array region. This localized modification targets the specific problem area without altering the overall device geometry or affecting other regions.
Solution Approach 2:
The connection line is divided into different segments with different widths: a first width in the array region and a second (larger) width in the edge region. This segmentation allows optimized control of dishing recess formation in the vulnerable edge area while preserving the original design in the array area.
Data Source
AI summary
Systems, devices, and methods for managing dishing recess in a semiconductor device are provided. In one aspect, a semiconductor device includes a first body structure located in an array region. The first body structure includes a first connection line extending along a first direction. The semiconductor device includes a second body structure located in an edge region adjacent to the array region. The second body structure includes a second connection line extending along the first direction and having a dishing recess. A width of the second connection line along a second direction is greater than a width of the first connection line along the second direction. The second direction is perpendicular to the first direction. The semiconductor device includes a blocking layer inside the dishing recess of the second connection line.