Flip-Chip Alignment Structures for Precise Qubit Chip Bonding
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Solution Overview
Problem
Existing processes for fabricating 3D integrated circuit devices, such as flip chip, lack precise control over the separation, orientation, and alignment of individual chips, which is crucial for advanced qubit chip design and higher component density in quantum computers.
Innovation Solution
The method involves etching a raised alignment structure on one substrate and a recessed alignment structure on another, positioning them to restrict movement along specific axes, and bonding them using flip-chip bumps or an indium film, with trapezium-shaped cross-sections to achieve precise alignment and separation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing flip chip processes are used for fabricating 3D integrated circuit devices, then chip stacking and component density are achieved, but precise control of chip separation, orientation, and alignment is lost
Solution Approach 1:
The patent applies preliminary action by pre-forming raised alignment structures on one substrate and recessed alignment structures on another substrate before the bonding process. These structures are etched into the substrates in advance, creating mechanical features that will automatically guide and constrain chip positioning during subsequent bonding, thereby achieving precise alignment without requiring complex real-time control mechanisms.
Solution Approach 2:
The patent introduces alignment structures as intermediary elements that mediate between the two substrates being bonded. The raised structure on one substrate fits into the recessed structure on the other substrate, acting as a mechanical intermediary that transfers and constrains positional information, ensuring precise alignment and orientation control during the bonding process.
2Manufacturing precision
If chip separation and orientation control are improved through alignment structures, then manufacturing precision increases, but the fabrication process complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the alignment control function into separate raised and recessed structures etched into different substrates. This segmentation allows each substrate to be prepared independently with its own alignment features, simplifying the overall fabrication process while maintaining precise control over chip separation and orientation during bonding.
3Adaptability or versatility
If alignment structures are added to control chip positioning, then component density and design flexibility improve, but device complexity increases
Solution Approach 1:
The patent employs asymmetry by creating raised alignment structures on one substrate and corresponding recessed structures on the other substrate. This asymmetric design provides precise mechanical guidance for chip positioning and orientation, enabling greater design flexibility for qubit chip configurations while maintaining relatively simple fabrication processes through standard etching techniques.
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 method allows for precise control of chip alignment and separation, enhancing the flexibility and density of qubit chip design, particularly in quantum computers, by restricting movement and ensuring accurate positioning of components.
Implementation Method 1
Bonding the first substrate to the second substrate may comprise thermocompression bonding
Data Source
AI summary
The invention relates to the field of chip fabrication, in particular to the fabrication of superconducting integrated circuits for use in quantum computers. Raised and recessed alignment structures are provided on the surfaces of two substrate such that the raised and recessed alignment structure extends within the recessed alignment structure to a maximum depth determined by the geometry of the alignment structures. The alignment structures act as a hard stop for positioning and aligning the substrates for flip chip bonding.