Integrated Hybrid Bonding Inspection for Chiplet Yield Loss
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Solution Overview
Problem
Existing hybrid bonding processes in semiconductor manufacturing are plagued by pre-bonding defects such as cracked or chipped dies, particulates, misalignment, voids, and delamination, leading to reduced yield and increased tool downtime.
Innovation Solution
A multi-chamber processing tool with integrated metrology systems for in-situ inspection of substrates and tape frames, including pre-bond and post-bond defect detection, and a master controller for data-driven process optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hybrid bonding processes are used without integrated inspection, then the process flow is simpler, but bonding yield decreases due to undetected pre-bond defects
Solution Approach 1:
The patent combines multiple inspection chambers and metrology systems directly into the hybrid bonding tool, merging defect detection capabilities with the bonding process. This integration allows pre-bond and post-bond inspections to be performed within the same equipment, resolving the contradiction by making the system more complex in structure but improving reliability through comprehensive defect detection without requiring separate external inspection equipment.
Solution Approach 2:
The patent implements pre-bond inspection chambers that detect defects before bonding occurs, allowing defective substrates or chiplets to be identified and removed in advance. This preliminary detection action prevents defects from propagating through the bonding process, thereby improving bonding yield while the integrated design manages the added complexity systematically.
2Reliability
If post-bond inspection is performed to detect defects, then bonding quality improves, but tool downtime increases for identifying and servicing tools
Solution Approach 1:
The patent incorporates real-time feedback mechanisms where metrology systems continuously monitor the bonding process and provide data to the control system. This feedback enables immediate detection of bonding quality issues during operation, allowing for in-situ adjustments that maintain high bonding quality while minimizing tool downtime by avoiding the need for extensive post-process inspection and servicing.
Solution Approach 2:
The integrated inspection system enables the bonding tool to self-diagnose and identify defects autonomously through built-in metrology chambers. The system performs self-verification of bonding quality without requiring external inspection equipment or manual intervention, thereby maintaining high bonding quality while reducing tool downtime for identifying and servicing the tool.
3Measurement precision
If multiple inspection chambers are integrated into the bonding tool, then defect detection capability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the inspection functionality into separate, modular chambers (pre-bond inspection chamber, post-bond inspection chamber, and metrology systems) that can be independently designed, manufactured, and maintained. This segmentation allows each chamber to be optimized for specific detection tasks, improving overall defect detection capability while managing equipment complexity through modular architecture that facilitates easier integration and maintenance.
Data Source
AI summary
Methods of hybrid bonding with inspection are provided herein. In some embodiments, a method of hybrid bonding with inspection includes: cleaning a substrate via a first cleaning chamber and a tape frame having a plurality of chiplets via a second cleaning chamber; inspecting, via a first metrology system, the substrate for pre-bond defects in a first metrology chamber and the tape frame for pre-bond defects in a second metrology chamber; bonding one or more of the plurality of chiplets to the substrate via a hybrid bonding process in a bonder chamber to form a bonded substrate; and performing, via a second metrology system different than the first metrology system, a post-bond inspection of the bonded substrate via a third metrology chamber for post-bond defects.