Composite Fill Particulates for Low-Strain Semiconductor Die Stacks
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Solution Overview
Problem
The presence of lateral gaps in semiconductor substrate stacks during manufacturing leads to inefficiencies and increased defect rates due to mechanical robustness issues, requiring multi-step processes that can cause damage and yield loss, and existing sealants introduce defects during high-temperature processing.
Innovation Solution
A supporting fill mixture comprising composite particulates with varying sizes and shapes is used in the lateral gap regions, altering the coefficient of thermal expansion to match the substrate's CTE, reducing strain and defect likelihood during high-temperature operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing sealants are used to fill lateral gaps in semiconductor substrate stacks, then the gaps are filled providing some structural support, but defects are introduced during high-temperature processing
Solution Approach 1:
The patent changes the thermal parameters of the fill material by using composite particulates with varying sizes, shapes, and material compositions. This allows tuning of the coefficient of thermal expansion (CTE) to match the semiconductor substrates, reducing thermal strain during high-temperature processing and eliminating the defect introduction problem associated with conventional sealants
Solution Approach 2:
The patent employs composite particulate materials consisting of multiple types of particles with different properties (sizes, shapes, compositions). This composite approach enables optimization of both mechanical robustness and thermal expansion characteristics, solving the contradiction between providing structural support and minimizing thermal strain-induced defects
2Stability of the object's composition
If multi-step processes are used to address mechanical robustness issues in lateral gap regions, then structural stability is improved, but manufacturing complexity and defect rates increase
Solution Approach 1:
The patent combines multiple functions into a single fill material: structural support, mechanical robustness, and thermal strain management are all achieved through the composite particulate fill mixture. This eliminates the need for separate multi-step processes to address each issue individually, reducing manufacturing complexity while maintaining stability
Solution Approach 2:
The patent applies local quality by placing composite particulates with specific size distributions and material properties in the lateral gap regions where they are most needed. The varying particulate sizes and shapes provide localized mechanical interlocking and structural support exactly where the substrates require enhanced robustness
3Ease of manufacture
If uniform particulates are used in the fill mixture, then manufacturing is simpler, but the coefficient of thermal expansion cannot be optimized to match substrate CTE
Solution Approach 1:
The patent changes the particulate parameters (size, shape, material composition) to create a distribution rather than using uniform particles. This allows precise control of the composite material's effective CTE to match the semiconductor substrates, achieving manufacturing precision in thermal properties while still maintaining ease of manufacture through established composite material processing techniques
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 use of composite particulates in the fill mixture enhances manufacturing efficiency by minimizing defects and reducing resource allocation, improving the robustness of semiconductor substrate stacks.
Implementation Method 1
altering the coefficient of thermal expansion to match the substrate's CTE, reducing strain and defect likelihood during high-temperature operations
Data Source
AI summary
Some implementations described herein include systems and techniques for fabricating a stacked die product. The systems and techniques include using a supporting fill mixture that includes a combination of types of composite particulates in a lateral gap region of a stack of semiconductor substrates and along a perimeter region of the stack of semiconductor substrates. One type of composite particulate included in the combination may be a relatively smaller size and include a smooth surface, allowing the composite particulate to ingress deep into the lateral gap region. Properties of the supporting fill mixture including the combination of types of composite particulates may control thermally induced stresses during downstream manufacturing to reduce a likelihood of defects in the supporting fill mixture and/or the stack of semiconductor substrates.