Hybrid-Bonded Capacitor Interface for Shorter 3D Interconnects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor packaging technologies face challenges such as large package footprints, noisy and long interconnect lengths, reliability issues, and increased noise from power supplies due to high-speed circuit switching, along with decreased stack assembly yield and requirements for extra chip processing in 2-D and 3-D packaging.
Innovation Solution
The development of hybrid bonded capacitor devices with inlayed capacitor elements, where semiconductor structures are hybrid bonded to form integrated capacitor structures with concentric conductive plates and dielectric layers, allowing for efficient vertical integration and reduced interconnect lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional semiconductor packaging technologies are used, then device integration is achieved, but package footprint becomes large and interconnect lengths increase
Solution Approach 1:
The patent transitions from conventional 2-D packaging to 3-D hybrid bonding architecture, stacking semiconductor wafers vertically to reduce footprint. Capacitor structures are integrated within the bonded interface of stacked wafers, utilizing the third dimension (vertical stacking) to achieve higher density while shortening interconnect paths between components.
Solution Approach 2:
Capacitor structures are nested within the hybrid bonding interface between stacked semiconductor wafers. The capacitor electrodes are formed within recesses of the bonding interface, allowing capacitor elements to be embedded in the interconnect structure itself, thereby reducing overall package footprint and eliminating separate capacitor components.
2Adaptability or versatility
If wafer bonding is used to construct integrated semiconductor devices, then device integration is improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into independent wafer fabrication steps followed by a separate bonding step. Each wafer can be fabricated using conventional processes, then bonded together with capacitor structures formed in the interface. This segmentation allows standard fabrication techniques to be used while achieving integrated 3-D device structures.
Solution Approach 2:
Capacitor structures are prepared in advance within recesses of the wafer surfaces before bonding occurs. The electrode patterns and dielectric layers are pre-formed in the bonding interface regions, so that when wafers are bonded, the capacitor structures are automatically assembled and connected to appropriate circuit nodes without requiring additional post-bonding fabrication steps.
3Ease of operation
If conventional packaging is used, then device assembly is straightforward, but signal integrity deteriorates due to noisy and long interconnects
Solution Approach 1:
By stacking wafers vertically and forming capacitors within the bonding interface, the patent reduces the physical distance between circuit elements from millimeter-scale lateral connections to micrometer-scale vertical connections. This dimensional transition dramatically shortens interconnect lengths, reducing noise and improving signal integrity while maintaining assembly simplicity through standard bonding processes.
4Quantity of substance
If 2-D and 3-D packaging techniques are used, then device density is increased, but yield decreases due to assembly issues and extra processing
Solution Approach 1:
The patent segments the device into separately fabricated wafers that are bonded together, allowing each wafer to be optimized and tested independently before assembly. This segmentation enables yield management at the wafer level rather than requiring perfect yield across the entire stacked assembly, improving overall manufacturing yield while achieving high device density.
Data Source
AI summary
A device comprises a first semiconductor structure disposed on a second semiconductor structure, and a capacitor structure disposed at an interface portion of the first semiconductor structure and the second semiconductor structure. The capacitor structure comprises a first conductive plate, at least one dielectric layer inlayed within the first conductive plate and at least a second conductive plate inlayed within the first conductive plate.