3D Capacitor Chip Integration for Stable Voltage in Semiconductor Stacks
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Solution Overview
Problem
Existing semiconductor technologies face challenges in further reducing the size and improving the operating characteristics of stacked semiconductor devices, particularly in 3D integrated circuits, as they struggle to effectively integrate active circuits and capacitors for enhanced performance.
Innovation Solution
The implementation of deep trench capacitors within semiconductor substrates, combined with through vias and metallization layers, allows for a 3D structure with system-on-chip integration, utilizing microbumps for die-to-die connections, which enhances capacitance and reduces interference, enabling larger voltage applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If semiconductor process node is reduced to sub-20 nm to increase integration density, then more components can be integrated into a given area, but manufacturing precision and reliability become more difficult to maintain
Solution Approach 1:
The patent transitions from 2D planar integration to 3D stacked architecture, where multiple semiconductor dies are vertically stacked and interconnected via through-silicon vias (TSVs). This dimensional change allows continued increase in integration density without further reduction of minimum feature size, thereby avoiding the manufacturing precision challenges associated with sub-20 nm nodes while still achieving higher component density through vertical stacking of multiple functional layers
Solution Approach 2:
The patent implements nested structures where through-silicon vias penetrate through entire semiconductor die stacks, and multiple interconnect layers are embedded within dielectric materials that are themselves embedded within the semiconductor substrate. This nested arrangement allows multiple interconnect levels to be integrated within the vertical space of a single die stack, increasing integration density without requiring proportional reduction in feature dimensions
2Volume of moving object
If stacked semiconductor devices are implemented to reduce physical size, then form factor is reduced, but device complexity and difficulty of manufacture increase
Solution Approach 1:
The patent divides the semiconductor device into multiple discrete functional dies that are stacked vertically, with each die performing a specific function. These segmented dies are interconnected through through-silicon vias and multiple interconnect layers, allowing the complex functionality to be distributed across simpler individual units while achieving compact 3D integration and reduced overall device form factor
Solution Approach 2:
The patent introduces dielectric materials as intermediary layers between conductive interconnect layers and semiconductor substrates. These dielectric intermediaries provide electrical isolation, mechanical support, and stress management, simplifying the overall manufacturing process by enabling modular assembly of stacked dies with standardized interconnect interfaces rather than requiring direct complex bonding between all components
3Reliability
If capacitors are integrated closer to semiconductor devices to reduce impedance at higher frequencies, then voltage stability improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the capacitor structure with the existing 3D integrated circuit architecture by forming capacitors using the same through-silicon via and interconnect layer structure that connects the semiconductor dies. The capacitors are integrated within the vertical stack, utilizing available dielectric and conductive materials from the interconnect structure, thereby achieving voltage stability through close proximity without adding separate complex capacitor manufacturing processes
Solution Approach 2:
The patent designs the interconnect structure to serve multiple functions: through-silicon vias and interconnect layers simultaneously provide both electrical connection between stacked dies and formation of capacitor electrodes. The dielectric materials serve both as insulation for interconnects and as capacitor dielectric layers. This multi-functionality reduces overall device complexity by eliminating the need for separate dedicated capacitor structures while achieving improved voltage stability
Data Source
AI summary
Three dimensional structures and methods are provided in which capacitors are formed separately from a first semiconductor device and then connected to the first semiconductor device. For example, a capacitor chip is provided and then bonded to a first semiconductor die. The capacitor chip and the first semiconductor die are encapsulated with a first encapsulant, and one of the capacitor chips and the first semiconductor die are thinned to expose through vias.