Hybrid-Bonded Inductor Structures for Compact 3D Chip Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional 2-D and 3-D packaging techniques for semiconductor devices face issues such as large footprint, noisy and long interconnects, low capacitance structures, increased noise from power supplies, decreased stack assembly yield, and chip stacking limitations, which affect signal integrity and efficiency.
Innovation Solution
Hybrid bonding techniques are employed to connect semiconductor structures with parts of an inductor structure, forming a complete inductor circuit by integrating metal pads across an interface between semiconductor dies, utilizing metal structures and dielectric layers to create a modular and compact inductor design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 2-D packaging techniques are used to connect multiple semiconductor IC chips, then the package structure can be constructed using direct chip attachment, but the package footprint becomes relatively large and the I/O communication paths become very long resulting in noisy interconnects
Solution Approach 1:
The patent transitions from 2-D coplanar chip arrangement to 3-D vertical stacking configuration, where multiple semiconductor chips are stacked vertically and interconnected through through-silicon vias (TSVs). This dimensional change reduces the package footprint by utilizing the vertical dimension for interconnect paths, thereby compacting the overall package area while maintaining manufacturing feasibility through established TSV and flip-chip bonding technologies.
2Ease of manufacture
If 2-D packaging techniques are used to connect multiple semiconductor IC chips, then the package structure can be constructed using direct chip attachment, but the I/O communication paths become very long resulting in noisy interconnects that degrade signal integrity
Solution Approach 1:
The patent transitions from 2-D coplanar chip arrangement to 3-D vertical stacking configuration, where multiple semiconductor chips are stacked vertically and interconnected through through-silicon vias (TSVs). This dimensional change reduces the package footprint by utilizing the vertical dimension for interconnect paths, thereby compacting the overall package area while maintaining manufacturing feasibility through established TSV and flip-chip bonding technologies.
3Productivity
If 3-D packaging techniques are used to vertically stack semiconductor IC chips, then the communication bandwidth between stacked chips is improved, but problematic issues arise including low capacitance structures, increased noise from power supplies, decreased stack assembly yield, and requirements for extra chip processing
Solution Approach 1:
The patent incorporates preliminary action by integrating capacitor structures during the chip fabrication process before stacking. Specifically, capacitor structures are formed on the backside of chips using the same TSV and metallization processes, allowing capacitance to be built into the power delivery network in advance. This preliminary integration of passive components eliminates the need for separate capacitor assembly steps and ensures reliable electrical connections are established before the stacking and bonding processes, thereby improving yield.
4Productivity
If 3-D packaging techniques are used to vertically stack semiconductor IC chips, then the communication bandwidth between stacked chips is improved, but low capacitance structures result which affects power supply performance
Solution Approach 1:
The patent incorporates preliminary action by integrating capacitor structures during the chip fabrication process before stacking. Specifically, capacitor structures are formed on the backside of chips using the same TSV and metallization processes, allowing capacitance to be built into the power delivery network in advance. This preliminary integration of passive components eliminates the need for separate capacitor assembly steps and ensures reliable electrical connections are established before the stacking and bonding processes, thereby improving yield.
5Productivity
If 3-D packaging techniques are used to vertically stack semiconductor IC chips, then the communication bandwidth between stacked chips is improved, but requirements for extra chip processing such as backside thinning increase device complexity
Solution Approach 1:
The patent applies universality by designing the chip backside to serve multiple functions: the same backside surface that would normally require thinning for thermal management or bonding is instead utilized as the mounting surface for capacitor structures and TSV interconnects. The metallization layers and TSV structures formed for electrical interconnection also provide mechanical support and thermal pathways. This multi-functional design eliminates the need for separate backside thinning processes and reduces overall device complexity while maintaining the benefits of 3-D stacking.
Data Source
AI summary
A device comprises a first semiconductor structure disposed on a second semiconductor structure, and a plurality of metal structures at an interface portion of the first semiconductor structure and the second semiconductor structure. The first semiconductor structure comprises a first part of an inductor structure and the second semiconductor structure comprises a second part of the inductor structure. The plurality of metal structures connect the first part of the inductor structure with the second part of the inductor structure.