Semiconductor Die Metallization Split Across Wafer Singulation
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Solution Overview
Problem
The complexity of semiconductor wafer metallization processes due to the need to accommodate a wide variety of metallization materials and layer types, leading to increased manufacturing complexity and costs.
Innovation Solution
A method of processing semiconductor wafers that involves partially forming both the frontside and backside metallizations with the same composition, and then singulating the wafer to form individual semiconductor dies, which are later completed during module assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete frontside and backside metallizations are formed with different materials and layer types, then the metallization functionality is optimized, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by forming a common metallization layer on both frontside and backside before singulation, preparing the structure in advance for subsequent individual customization. This preliminary common layer provides foundational functionality while enabling later differentiation without requiring complete separate metallization processes for each side.
Solution Approach 2:
The patent segments the metallization formation process into two distinct phases: (1) a common phase where the same metallization layer is formed on both sides of the wafer before singulation, and (2) an individual phase where additional side-specific metallization layers are formed after singulation. This segmentation reduces overall process complexity by separating common and unique requirements.
2Productivity
If complete metallization is formed before singulation, then manufacturing efficiency is improved, but process complexity increases due to accommodating different materials and layers
Solution Approach 1:
The patent performs preliminary metallization action by forming the common metallization layer on both frontside and backside before singulation, achieving efficient batch processing for the shared portion of the metallization structure. This preliminary formation maintains manufacturing efficiency while avoiding the complexity of complete individual metallization before singulation.
Solution Approach 2:
The patent applies partial action by forming only the common metallization layer before singulation, rather than completing the entire metallization process at that stage. This partial completion optimizes the balance between batch processing efficiency and process complexity, leaving the side-specific layers to be formed individually after singulation.
3Device complexity
If the same metallization composition is used for both frontside and backside, then manufacturing complexity is reduced, but the ability to optimize for different functional requirements is limited
Solution Approach 1:
The patent uses preliminary action to form the common metallization layer with uniform composition on both sides before singulation, achieving manufacturing simplicity. The preliminary layer provides baseline functionality while the subsequent individual metallization steps enable functional optimization for each side's specific requirements.
Solution Approach 2:
The patent segments metallization into common and side-specific portions, where the common layer uses the same composition for both sides to reduce manufacturing complexity, while additional individual layers are formed after singulation to provide functional optimization for each side's specific requirements.
Data Source
AI summary
A method of processing a semiconductor wafer includes: forming an electronic device at each die location of the semiconductor wafer; partially forming a frontside metallization over a frontside of the semiconductor wafer at each die location; partially forming a backside metallization over a backside of the semiconductor wafer at each die location; and after partially forming both the frontside metallization and the backside metallization but without completing either the frontside metallization or the backside metallization, singulating the semiconductor wafer between the die locations to form a plurality of individual semiconductor dies, wherein the partially formed frontside metallization and the partially formed backside metallization have a same composition. Semiconductor dies and methods of producing semiconductor modules are also described.