Dummy Blocks for Dielectric Layer Uniformity in IC Packaging
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving uniform dielectric layer thickness and insulation coverage in edge regions during the packaging of integrated circuit dies, leading to potential device failure due to insufficient coverage and insulation near the scribe line regions.
Innovation Solution
The use of dummy blocks made from dielectric materials like polybenzoxazole (PBO) or polyimide, which are patterned and deposited in the scribe line regions to provide structural support and filler, ensuring uniform thickness and reducing depression effects on the dielectric layers, thereby preventing device failure during the singulation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dielectric layers are deposited over the entire wafer surface including scribe line regions, then continuous coverage is achieved, but non-uniform thickness and depression effects occur in edge regions
Solution Approach 1:
The patent introduces dummy blocks specifically in scribe line regions to create local structural support where needed. These dummy blocks are formed with the same dielectric material as the overlying dielectric layers, providing localized reinforcement to prevent depression and maintain uniform thickness in edge regions without affecting the overall wafer structure.
Solution Approach 2:
The dummy blocks are formed in advance before the dielectric layers are deposited. This preliminary action ensures that when subsequent dielectric layers are deposited, the underlying dummy blocks provide immediate structural support, preventing depression and maintaining uniform thickness from the outset rather than requiring corrective measures afterward.
2Manufacturing precision
If dummy blocks are formed in scribe line regions, then dielectric layer uniformity is improved, but device complexity increases
Solution Approach 1:
The dummy blocks are formed using the same dielectric material as the overlying dielectric layers. This material homogeneity ensures that the dummy blocks blend seamlessly with the existing structure, eliminating the need for separate material processing steps and reducing overall device complexity while maintaining manufacturing precision.
Data Source
AI summary
Package structures and methods of forming package structures are described. A method includes depositing and patterning a first dielectric material. The first dielectric material is deposited in first and second package component regions and in a scribe line region. The scribe line region is disposed between the first and second package component regions. The patterning the first dielectric material forms a first dielectric layer in each of the first and second package component regions and a dummy block in the scribe line region. The dummy block is separated from the first dielectric layer in each of the first and second package component regions. The method further includes forming a metallization pattern on the first dielectric layer; depositing a second dielectric material on the first dielectric layer and the metallization pattern; and patterning the second dielectric material to form a second dielectric layer.