Wafer Bonding Deformation Control via Segmented Gas Pressure
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Solution Overview
Problem
The challenge in semiconductor technology is achieving accurate wafer deformation adjustment and bonding alignment, particularly as feature sizes approach the nanometer range, where existing techniques fail to ensure effective bonding alignment, hindering the integration of complex micro/nano electromechanical systems and 3D ICs.
Innovation Solution
A method and system for wafer bonding that involves releasing inner, middle, and outer rings of wafers from chucks and applying controlled gas pressures to adjust deformation, using alignment marks to analyze and compensate for run-out misalignment, ensuring precise alignment and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional wafer bonding techniques are used, then the bonding process is simple, but alignment accuracy deteriorates as feature sizes approach nanometer range
Solution Approach 1:
The wafer is divided into three independent zones (inner ring, middle ring, outer ring) that can be released and deformed separately. This segmentation allows precise local deformation control to compensate for run-out misalignment while maintaining overall bonding process manageability
Solution Approach 2:
The method performs preliminary deformation adjustment on the first wafer before bonding with the second wafer. By pre-compensating for run-out misalignment through controlled deformation of the first wafer's rings, the alignment accuracy is improved before the actual bonding occurs
2Manufacturing precision
If uniform gas pressure is applied to the entire wafer, then the process is simple, but deformation control precision deteriorates
Solution Approach 1:
Different gas pressures are applied to different zones of the wafer. The inner ring receives a first gas pressure, the middle ring receives a second gas pressure, and the outer ring maintains a third gas pressure. This local quality approach enables precise deformation control at each zone to achieve the desired wafer shape adjustment
Solution Approach 2:
The pressure control system is segmented into three independent pressure zones corresponding to the three wafer rings. Each zone can be controlled independently through separate gas supply channels, allowing precise deformation control without requiring complex global pressure management
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 improves alignment accuracy, reduces device size, and increases product yield by compensating for translational, rotational, and run-out misalignments during wafer bonding, enabling more complex semiconductor system integration.
Implementation Method 1
applying a first gas pressure to the inner rings of the first wafer, such that the inner rings of the first wafer are in contact with a second wafer
Implementation Method 2
releasing middle rings of the first wafer from the first chuck, such that the middle rings of the first wafer are deformed under a second gas pressure
Implementation Method 3
releasing inner rings of the second wafer from a second chuck, and applying a third gas pressure to the inner rings of the second wafer
Data Source
AI summary
Embodiments of methods and systems for adjusting wafer deformation during wafer bonding are provided. The method comprises: releasing inner rings of a first wafer, and applying a first gas pressure to the inner rings of the first wafer, such that the inner rings of the first wafer are in contact with a second wafer; releasing middle rings of the first wafer, such that the middle rings of the first wafer are deformed under a second gas pressure and in contact with the second wafer; releasing inner rings of the second wafer, and applying a third gas pressure less than the first gas pressure to the inner rings of the second wafer; releasing middle rings of the second wafer; and releasing outer rings of the first wafer and releasing outer rings of the second wafer simultaneously.