Hybrid Bonded Decoupling Capacitors in Multilayer Substrates
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Solution Overview
Problem
The miniaturization and increased power management requirements in mobile electronic devices pose challenges in effectively forming decoupling capacitors within package substrates to manage ground bounce in high-performance circuits.
Innovation Solution
The formation of decoupling capacitors using hybrid bonding within multilayer substrates, employing dummy bond pads and high-k dielectric materials like hafnium or zirconium, which are connected to voltage or ground references, allowing for additional capacitance in previously unused areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional capacitor formation methods are used in package substrates, then capacitor placement is limited to specific areas, but the capacitance is insufficient to meet increased power management requirements
Solution Approach 1:
The substrate is divided into multiple segments or regions, with capacitors distributed across different areas including previously unused regions. This segmentation allows capacitance to be accumulated across the entire substrate rather than concentrated in one location, resolving the contradiction between limited placement area and insufficient total capacitance.
Solution Approach 2:
The invention utilizes the vertical dimension by forming capacitors at different depths within the substrate structure, and also exploits previously unused lateral areas. This multi-dimensional approach increases the effective area available for capacitor placement without requiring additional substrate real estate.
2Quantity of substance
If dummy bond pads are used to form capacitors, then additional capacitance is achieved in previously unused areas, but the device complexity increases
Solution Approach 1:
Dummy bond pads, which would otherwise be unused or wasted structures, are repurposed to serve dual functions: maintaining electrical connectivity where needed and providing capacitor formation in previously unused areas. This multi-functionality increases capacitance without requiring entirely separate structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The existing dummy bond pad structures serve themselves by being converted into functional capacitors. Rather than requiring entirely new capacitor structures to be added (which would increase complexity), the existing unused areas are made productive, achieving additional capacitance through self-utilization of available resources.
3Quantity of substance
If hybrid bonding is used to form decoupling capacitors, then capacitors can be placed at multiple locations enhancing capacitance, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process is segmented into distinct stages: forming first and second substrates with respective metal layers, applying dielectric material, and then hybrid bonding. This segmentation allows each stage to be optimized independently and enables parallel processing of multiple substrates, making the complex multi-location capacitor formation manageable and scalable.
Solution Approach 2:
The metal layers and dielectric materials are prepared and positioned on the substrates before the hybrid bonding step. This preliminary action ensures that all capacitor components are in place and correctly aligned before the irreversible bonding process, simplifying manufacturing by avoiding the need for post-bonding adjustments or complex assembly operations.
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 enables the placement of capacitors at multiple locations within the substrate, enhancing capacitance and supporting higher performance in mobile devices by effectively managing ground bounce and power management.
Implementation Method 1
a dielectric layer between the first metal layer and the second metal layer
Implementation Method 2
high-k dielectric materials like hafnium or zirconium
Data Source
AI summary
Embodiments herein relate to systems, apparatuses, or processes for forming a decoupling capacitor within a multilayer die using hybrid bonding. Dummy bond pads may be used to form plates for the capacitor and a high-k dielectric material may be deposited between the plates prior to hybrid bonding. Other embodiments may be described and/or claimed.