Vertically Offset Hybrid-Bond Interconnects for Precise Alignment
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Solution Overview
Problem
Conventional hybrid bonding operations face challenges in aligning oxide and metal bonding zones, leading to misalignment and reduced bond strength in semiconductor packages.
Innovation Solution
The implementation of three-dimensional hybrid-bonding interconnect structures with vertically offset bonding surfaces, including a dielectric layer and interconnect structures with conductive elements and insulating materials, providing additional bonding area and mechanical alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hybrid bonding is used with coplanar bonding surfaces, then the bonding process is simpler, but alignment precision deteriorates leading to misalignment between oxide and metal bonding zones
Solution Approach 1:
The patent transitions from coplanar bonding surfaces to vertically offset bonding surfaces, introducing a vertical dimension to the bonding interface. The first bonding surface is positioned at a different vertical level than the second bonding surface, creating a stepped configuration that enables mechanical interlocking and improves alignment precision between bonding zones.
Solution Approach 2:
The vertically offset bonding surfaces create a nested or interlocking structure where one bonding surface partially overlaps or interlocks with the other in the vertical dimension. This nesting effect provides mechanical coupling that enhances alignment precision while managing the increased structural complexity.
2Manufacturing precision
If vertically offset bonding surfaces are implemented, then alignment precision improves through mechanical coupling, but device complexity increases
Solution Approach 1:
The bonding structure employs asymmetric vertically offset surfaces where the first bonding surface and second bonding surface are positioned at different vertical levels. This asymmetry creates a mechanical coupling configuration that inherently guides alignment during bonding, improving precision while the asymmetric design itself manages the complexity through functional integration.
3Strength
If bonding surface area is increased through vertical offset, then bond strength improves, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes the vertical dimension to expand the bonding surface area beyond the lateral plane. By creating vertically offset surfaces at different elevation levels, the total bonding area increases, providing more bonding interfaces and improving overall bond strength while distributing the manufacturing complexity across vertical layers.
Solution Approach 2:
The bonding interface is segmented into multiple vertical levels or steps, with the first bonding surface positioned at one vertical level and the second bonding surface at another. This segmentation increases the total bonding area by creating multiple bonding zones at different heights, improving bond strength while organizing the manufacturing process into discrete vertical stages.
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
Enhances bond strength and alignment consistency by increasing the surface area available for bonding and introducing a mechanical coupling mechanism, improving the reliability of semiconductor devices.
Implementation Method 1
During typical hybrid bonding processes, oxide-oxide bonds form between corresponding oxide bonding zones
Implementation Method 2
The temperature and high strength of the oxide-oxide bonds can induce compression to facilitate forming metal-metal bonds between corresponding metal bonding zones
Data Source
AI summary
Semiconductor devices having interconnect structures with vertically offset bonding surfaces, and associated systems and methods, are disclosed herein. In one embodiment, a semiconductor device includes a semiconductor substrate at least partially covered by a first dielectric material having an upper surface, and an interconnect structure extending therefrom. The interconnect structure can include a plurality of conductive elements, and a continuous region of a first insulating material at least partially between the plurality of conductive elements. The plurality of conductive elements and the continuous region can have coplanar end surfaces. The interconnect structure can further include a perimeter structure at least partially surrounding the plurality of conductive elements and the continuous region. The perimeter structure can have an uppermost surface that can be vertically offset from the upper surface of the first dielectric material and/or the coplanar end surfaces.