Semiconductor Package Structure Using Rear-Side Warpage Patterns
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Solution Overview
Problem
The semiconductor industry faces challenges in warpage control techniques for semiconductor dies as demand increases for miniaturization, higher speed, greater bandwidth, lower power consumption, and reduced latency, necessitating effective methods to manage thermal expansion and maintain structural integrity during the integration of electronic components.
Innovation Solution
The implementation of warpage control patterns on the rear surface of semiconductor wafers, combined with hybrid bonding techniques and thermal annealing, to counterbalance thermal expansion and ensure precise alignment and bonding of semiconductor dies, thereby minimizing warpage and enhancing the reliability of 3D packaging structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If repeated reductions in minimum feature size are implemented to increase integration density, then more components can be integrated into a given area, but warpage control becomes more difficult
Solution Approach 1:
The patent applies local quality by forming a stress compensation layer with specific material properties in a targeted location (over the through-conductor vias) to counteract warpage. This localized structural modification allows the region to have different stress characteristics than the surrounding areas, compensating for thermal expansion differences and maintaining flatness despite miniaturization effects.
Solution Approach 2:
The patent employs composite materials by combining the stress compensation layer (with first coefficient of thermal expansion) with the substrate (with second coefficient of thermal expansion). This composite structure creates a balanced system where the different thermal expansion properties of the layers work together to reduce overall warpage, enabling better control as feature sizes are reduced for higher integration density.
2Length of moving object
If miniaturization is pursued to meet demand for higher speed and greater bandwidth, then component size is reduced, but thermal expansion management becomes more challenging
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the coefficients of thermal expansion for different layers. The stress compensation layer is designed with a specific CTE parameter that differs from the substrate, and this parameter is optimized to compensate for thermal effects. By adjusting these material parameters, the structure maintains dimensional stability despite miniaturization and thermal cycling.
Solution Approach 2:
The stress compensation layer is formed in advance (before final assembly and testing) to preemptively counteract thermal expansion effects. This preliminary structural modification ensures that when thermal cycling occurs during operation, the pre-engineered stress distribution prevents warpage, allowing miniaturized components to maintain their dimensional integrity.
3Quantity of substance
If integration density is increased to reduce power consumption and latency, then more components are packed into smaller area, but structural integrity during assembly is compromised
Solution Approach 1:
The patent strengthens structural integrity at critical locations by forming the stress compensation layer specifically over the through-conductor vias. These via regions are stress concentration points in high-density integrations, and the localized reinforcement provides additional mechanical support and stress distribution, preventing defects during assembly while maintaining high component density.
Solution Approach 2:
The composite structure of multiple layers with different mechanical and thermal properties creates a more robust assembly. The stress compensation layer acts as a reinforcing element within the composite, distributing stresses more evenly across the structure and preventing catastrophic failures during the assembly process, thereby maintaining structural integrity despite increased integration density.
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 effectively controls warpage, increases the reliability of 3D packaging structures, and improves the yield and cost-effectiveness by maintaining structural integrity and alignment precision during the integration of semiconductor components.
Implementation Method 1
counterbalance thermal expansion and ensure precise alignment and bonding of semiconductor dies, thereby minimizing warpage
Implementation Method 2
thermal annealing, to counterbalance thermal expansion and ensure precise alignment and bonding of semiconductor dies
Data Source
AI summary
A semiconductor device including a first semiconductor die, a second semiconductor die, an insulating encapsulation and a warpage control pattern is provided. The first semiconductor die includes an active surface and a rear surface opposite to the active surface. The second semiconductor die is disposed on the active surface of the first semiconductor die. The insulating encapsulation is disposed on the active surface of the first semiconductor die and laterally encapsulates the second semiconductor die. The warpage control pattern is disposed on and partially covers the rear surface of the first semiconductor die.