Semiconductor Die Mechanical Decoupling Trenches
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Solution Overview
Problem
Semiconductor integrated devices face critical issues due to mechanical deformations caused by package-induced stresses, leading to drifts in electrical parameters, which existing solutions fail to robustly address, especially in components like OA and MEMS where stability is crucial.
Innovation Solution
A mechanical decoupling region is introduced within the semiconductor die to isolate the active area from package-induced stresses, utilizing trenches and a protective layer with a lower Young's Modulus to absorb deformations, maintaining the active area substantially undeformed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the die is attached to the die-carrier and enclosed in a package, then the die is protected and electrical connections are provided, but mechanical stresses cause bending and drift of electrical parameters
Solution Approach 1:
The die is segmented into a stress-sensitive active area and a stress-absorbing mechanical decoupling region. The active area contains the electronic components that require stability, while the mechanical decoupling region is designed to absorb package-induced stresses through controlled deformation, preventing stress transmission to the active area.
Solution Approach 2:
The harmful mechanical stresses are extracted from the active area by introducing a dedicated mechanical decoupling region. This region acts as a stress buffer that isolates the active area from package-induced stresses, allowing the stresses to be absorbed in a controlled manner without affecting the electrical parameters.
2Reliability
If package materials and dimensions are optimized to reduce deformations, then mechanical stresses are reduced, but the solution is not robust against material property spreads and aging
Solution Approach 1:
The mechanical decoupling region is pre-designed with specific geometric features (trenches, varying thickness) that enable it to absorb stresses regardless of material property variations. This preliminary structural design ensures robustness against aging and material spreads without requiring complex package material selection or optimization.
3Reliability
If the active area is completely isolated from the package, then stress-induced deformations are eliminated, but electrical connections and mechanical support are compromised
Solution Approach 1:
Different regions of the die are assigned different mechanical properties: the active area maintains high stiffness for electrical stability, while the mechanical decoupling region has reduced stiffness (through trenches and varying thickness) to absorb stresses. This local differentiation allows stress isolation while maintaining electrical connection capabilities through the substrate.
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
The solution effectively reduces or eliminates stress-induced deformations in the active area, maintaining parameter stability and performance across various package materials and thermal conditions without extensive manufacturing process modifications.
Implementation Method 1
utilizing trenches and a protective layer with a lower Young's Modulus to absorb deformations
Data Source
AI summary
A semiconductor integrated device is provided with: a die having a body of semiconductor material with a front surface, and an active area arranged at the front surface; and a package having a support element carrying the die at a back surface of the body, and a coating material covering the die. The body includes a mechanical decoupling region, which mechanically decouples the active area from mechanical stresses induced by the package; the mechanical decoupling region is a trench arrangement within the body, which releases the active area from an external frame of the body, designed to absorb the mechanical stresses induced by the package.