Multilayer Dielectric-Metal Edge Structure for IC Damage Prevention
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Solution Overview
Problem
Current methods for preventing damage to integrated circuit dice during fabrication are inadequate as they do not protect against damages occurring throughout the process, require additional fabrication steps, and cannot be performed simultaneously with electrical component fabrication, leading to increased time and cost, and lack detection capabilities.
Innovation Solution
A multilayer structure is formed in multiple levels and edges of the die, comprising a support layer, dielectric pillars, metal layers, insulation layers, and additional dielectric pillars, which provides protection, testing channels for probes, and supports the C4 process, allowing simultaneous fabrication with electrical components and reducing fabrication time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If protective structures are formed on the edges of each die using current methods, then corner protection during wafer dicing is improved, but fabrication time and cost increase due to additional fabrication steps
Solution Approach 1:
The patent combines the protective structure formation with the existing electrical component fabrication process. The same dielectric and metal layers that form electrical components are also used to create protective structures at the die edges, merging two functions into a single integrated process without requiring separate fabrication steps.
Solution Approach 2:
The multilayer dielectric and metal structures serve dual purposes: they function as electrical components (via, metal traces, insulation) in the active regions of the die, and simultaneously provide mechanical protection and support structures at the die edges. This multi-functionality eliminates the need for dedicated protective structures.
2Strength
If protective structures are formed on the edges of each die using current methods, then corner protection during wafer dicing is improved, but fabrication cost increases due to additional fabrication steps
Solution Approach 1:
The patent combines the protective structure formation with the existing electrical component fabrication process. The same dielectric and metal layers that form electrical components are also used to create protective structures at the die edges, merging two functions into a single integrated process without requiring separate fabrication steps.
Solution Approach 2:
The multilayer dielectric and metal structures serve dual purposes: they function as electrical components (via, metal traces, insulation) in the active regions of the die, and simultaneously provide mechanical protection and support structures at the die edges. This multi-functionality eliminates the need for dedicated protective structures.
3Strength
If current protective methods are used, then corner protection is provided, but damage detection throughout fabrication is not enabled
Solution Approach 1:
The multilayer dielectric and metal structures serve dual purposes: they function as electrical components (via, metal traces, insulation) in the active regions of the die, and simultaneously provide mechanical protection and support structures at the die edges. This multi-functionality eliminates the need for dedicated protective structures.
Solution Approach 2:
The patent introduces testing channels formed by the multilayer structures that act as intermediaries for damage detection. These channels allow electrical and optical probes to access internal structures and detect damages during fabrication, serving as a mediator between the external testing equipment and the internal die structures.
4Strength
If protective structures are added after fabrication, then edge protection is provided, but the fabrication process cannot be optimized for simultaneous protection and component creation
Solution Approach 1:
The patent performs protective structure formation during the fabrication process itself, rather than as a post-processing step. The dielectric and metal layers are deposited and patterned to simultaneously create both electrical components and protective structures, performing the protection function preliminarily within the main fabrication flow.
Solution Approach 2:
The patent combines the protective structure formation with the existing electrical component fabrication process. The same dielectric and metal layers that form electrical components are also used to create protective structures at the die edges, merging two functions into a single integrated process without requiring separate fabrication steps.
Data Source
AI summary
Various embodiments facilitate die protection for an integrated circuit. In one embodiment, a multilayer structure is formed in multiple levels and along the edges of a die to prevent and detect damages to the die. The multilayer structure includes a support layer, a first plurality of dielectric pillars overlying the support layer, a metal layer that fills spaces between the first plurality of dielectric pillars, an insulation layer overlying the first plurality of dielectric pillars and the metal layer, a second plurality of dielectric pillars overlying the insulation layer, and a second metal layer that fills spaces between the second plurality of dielectric pillars.