Direct Bonding Layout for Fine-Pitch Microelectronic Assemblies
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Solution Overview
Problem
Conventional integrated circuit (IC) packages using solder-based attach technologies are limited by pitch constraints, which hinder the achievement of fine pitches required for next-generation devices, and do not effectively manage thermal and electrical performance.
Innovation Solution
The use of direct bonding techniques between microelectronic components and an organic interposer, which allows for ultra-fine pitch connections and enhanced thermal and electrical performance by eliminating the need for solder and using metal-to-metal or hybrid bonding methods with varying metal densities and dielectric materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solder-based attach technologies are used, then manufacturing process is simple, but pitch constraints prevent achievement of fine pitches required for next-generation devices
Solution Approach 1:
The patent changes the bonding parameters from solder-based eutectic bonding to direct metal-to-metal bonding with controlled metallization layers. By modifying the metallization structure (adding specific metal layers like Cu, Ni, Au with controlled thicknesses and compositions) and bonding conditions (temperature, pressure, time), the patent achieves ultra-fine pitch bonding without solder, resolving the pitch constraint while maintaining manufacturability through controlled parameter changes.
Solution Approach 2:
The patent employs composite metallization structures with multiple metal layers (e.g., Cu/Ni/Au combinations, or gradient metal compositions) to achieve both fine pitch bonding capability and reliable electrical connection. The composite metallization approach allows optimization of each layer's properties for specific functions (diffusion barrier, adhesion, conductivity), enabling ultra-fine pitch while maintaining ease of manufacture through standardized multi-layer deposition processes.
2Reliability
If conventional solder-based attach is used, then device assembly is straightforward, but thermal and electrical performance management is insufficient
Solution Approach 1:
The patent applies local quality by creating spatially varying metallization structures within the bonding interface. Different regions of the bonding pad or interconnect structure have different metal compositions, thicknesses, or layer configurations optimized for local requirements (e.g., higher Cu content for thermal conduction in certain areas, Ni for diffusion barrier in others). This localized optimization enhances thermal and electrical performance without requiring overall structural complexity.
Solution Approach 2:
The direct bonding metallization structure serves multiple functions simultaneously: electrical conduction, thermal management, mechanical bonding, and diffusion prevention. By designing the metallization layers to fulfill multiple roles (e.g., a Ni layer providing both adhesion and oxidation resistance, or Cu pillars serving as both electrical interconnects and heat sinks), the patent achieves superior thermal and electrical performance without increasing device complexity through additional separate components.
3Reliability
If direct bonding with varying metal densities is implemented, then thermal management and electrical conductivity are enhanced, but manufacturing process becomes more complex
Solution Approach 1:
The patent controls metal density variations through precise deposition parameters (thickness, composition, porosity) of different metallization layers. By adjusting deposition conditions (temperature, pressure, deposition rate) and layer configurations during manufacturing, the desired metal density distribution is achieved. This parameter control enables enhanced thermal and electrical properties while maintaining compatibility with existing semiconductor fabrication processes, thus not significantly increasing manufacturing complexity.
Data Source
AI summary
Disclosed herein are microelectronic assemblies including direct bonding, as well as related structures and techniques. For example, in some embodiments, a microelectronic assembly may include a first microelectronic component and a second microelectronic component coupled to the first microelectronic component by a direct bonding region, wherein the direct bonding region includes a first subregion and a second subregion, and the first subregion has a greater metal density than the second subregion. In some embodiments, a microelectronic assembly may include a first microelectronic component and a second microelectronic component coupled to the first microelectronic component by a direct bonding region, wherein the direct bonding region includes a first metal contact and a second metal contact, the first metal contact has a larger area than the second metal contact, and the first metal contact is electrically coupled to a power/ground plane of the first microelectronic component.