Bevel Trimming 3D Semiconductor Substrate Edges
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving higher integration density and reducing interconnection complexity in two-dimensional integrated circuits, leading to physical limits and increased risk of wafer cracking and safety hazards due to sharp edges during the wafer thinning process of three-dimensional ICs.
Innovation Solution
A method of bevel trimming is employed to convert the curved edges of a 3D semiconductor device substrate into a planar edge through a vertical grinding process, allowing for safe thinning and exposure of through substrate vias while preventing cracking and edge-related defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wafer thinning is performed on a substrate with curved edges, then three-dimensional integrated circuits can be fabricated, but sharp edges are formed that cause cracking and safety hazards
Solution Approach 1:
The bevel trimming process is performed before the thinning process to pre-modify the edge geometry. By creating a chamfered edge profile in advance, the substrate is prepared to avoid sharp edge formation during subsequent thinning operations, thereby preventing cracking while enabling 3D IC fabrication
Solution Approach 2:
The curved edges of the substrate are transformed into a chamfered geometry with rounded transitions. Instead of creating sharp angular edges during thinning, the bevel trimming process introduces a controlled curved transition zone that eliminates stress concentration points while maintaining the structural integrity needed for 3D IC fabrication
2Productivity
If wafer thinning is performed on a substrate with curved edges, then three-dimensional integrated circuits can be fabricated, but safety hazards occur due to sharp edges
Solution Approach 1:
The bevel trimming process is performed before thinning to pre-modify the edge geometry. By creating a chamfered edge profile in advance, the substrate is prepared to avoid sharp edge formation during subsequent thinning operations, thereby preventing cracking while enabling 3D IC fabrication
Solution Approach 2:
The naturally occurring curved edges that would normally create sharp points during thinning are converted into a beneficial chamfered geometry. The bevel trimming process transforms the potential harm of curved edges into a protective feature by creating a controlled edge profile that prevents cracking and improves safety during handling
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach eliminates sharp edges, reduces the risk of cracking, and enhances the flexibility and safety of the substrate, enabling more efficient fabrication of 3D semiconductor devices by maintaining the integrity of the device structure during thinning.
Implementation Method 1
performing a bevel trimming step to the curved edge of the substrate for obtaining a planar edge
Implementation Method 2
thinning the substrate to expose the through substrate vias
Data Source
AI summary
A method of bevel trimming a three dimensional (3D) semiconductor device is disclosed, comprising providing a substrate with stack layers thereon and through substrate vias (TSV) therein, wherein an edge of the substrate is curved, performing a bevel trimming step to the curved edge of the substrate for obtaining a planar edge, and thinning the substrate to expose the through substrate vias.