Decoupling Trench Capacitor Depth Layout for Low-Stress Die Packages
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Solution Overview
Problem
The challenge in semiconductor die packages is to increase decoupling capacitance while minimizing physical stress, which can lead to cracking, warpage, and device failures.
Innovation Solution
The solution involves forming decoupling trench capacitor structures with varying depths within the semiconductor substrate, allowing for sufficient capacitance while reducing the likelihood of physical stress and associated failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decoupling capacitance is increased to improve performance, then capacitance is improved, but physical stress increases leading to cracking and warpage
Solution Approach 1:
The patent applies local quality by creating decoupling trench capacitor structures with varying depths at different locations within the semiconductor substrate. Rather than using uniform-depth trenches throughout, the invention strategically places deeper trenches in regions where additional capacitance is needed while using shallower trenches in other areas, thereby locally optimizing capacitance distribution without uniformly increasing physical stress across the entire substrate.
Solution Approach 2:
The patent implements parameter changes by varying the depth parameter of decoupling trench capacitor structures across different regions of the semiconductor substrate. This parameter variation allows the system to achieve higher overall capacitance while controlling the stress distribution, as not all trenches penetrate to the same depth, thus reducing the cumulative physical stress that would lead to cracking and warpage.
2Reliability
If uniform depth decoupling trenches are used, then manufacturing simplicity is maintained, but insufficient capacitance is achieved
Solution Approach 1:
The patent applies segmentation by dividing the decoupling trench capacitor structures into multiple groups with different depths. Rather than creating a single uniform trench structure, the invention segments the trenches into first, second, and potentially third groups with varying depths, allowing each segment to contribute differently to the overall capacitance while maintaining a systematic fabrication approach.
Solution Approach 2:
The patent introduces dimensional variation by changing the depth dimension of the decoupling trenches. Instead of all trenches having the same depth (one-dimensional uniformity), the invention varies the depth parameter across different trench locations, adding a second dimension of control (depth variation) that enables higher capacitance while managing stress through controlled structural diversity.
3Reliability
If deeper trenches are formed throughout the substrate, then capacitance increases, but physical stress and warpage increase
Solution Approach 1:
The patent applies local quality by creating decoupling trench capacitor structures with varying depths at different locations within the semiconductor substrate. Rather than using uniform-depth trenches throughout, the invention strategically places deeper trenches in regions where additional capacitance is needed while using shallower trenches in other areas, thereby locally optimizing capacitance distribution without uniformly increasing physical stress across the entire substrate.
Solution Approach 2:
The patent implements parameter changes by varying the depth parameter of decoupling trench capacitor structures across different regions of the semiconductor substrate. This parameter variation allows the system to achieve higher overall capacitance while controlling the stress distribution, as not all trenches penetrate to the same depth, thus reducing the cumulative physical stress that would lead to cracking and warpage.
Data Source
AI summary
A semiconductor die included in a semiconductor die package may include a plurality of decoupling trench capacitor regions in a device region of the semiconductor die. At least two or more of the decoupling trench capacitor regions include decoupling trench capacitor structures having different depths. The depths of the decoupling trench capacitor structures in the decoupling trench capacitor regions may be selected to provide sufficient capacitance so as to satisfy circuit decoupling parameters for circuits of the semiconductor die package, while reducing the likelihood of warping, breaking, and/or cracking of the semiconductor die package.