Hybrid Bonding Inspection Flow for Pre- and Post-Bond Defects
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Solution Overview
Problem
Hybrid bonding processes in semiconductor manufacturing are hindered 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, followed by cleaning and hybrid bonding, to enhance defect detection and yield.
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 defect detection capability is insufficient leading to reduced yield
Solution Approach 1:
The patent combines multiple previously separate tools (cleaning chambers, metrology systems, bonder chambers) into a single integrated hybrid bonding tool. This merging enables seamless pre-bond and post-bond inspections without transferring substrates between tools, thereby improving bonding yield through comprehensive defect detection while managing complexity through unified system architecture.
Solution Approach 2:
The patent implements pre-bond inspection capabilities that detect defects (particulates, cracks, misalignment) before the bonding process occurs. By performing inspection actions beforehand, the system can identify and flag defective substrates or chiplets prior to bonding, preventing yield loss from undetected pre-bond defects.
2Reliability
If post-bond inspection is performed to detect defects, then defect detection capability is improved, but tool downtime increases due to additional inspection steps
Solution Approach 1:
The patent maintains continuous substrate processing flow by integrating post-bond inspection within the same tool that performs bonding. The substrate remains in the tool and is directly transferred from the bonder chamber to the metrology chamber without removal, eliminating idle time and maintaining continuous productive action while still performing comprehensive defect detection.
Solution Approach 2:
By merging the post-bond inspection function into the bonding tool itself, the patent eliminates the need to transfer substrates to separate inspection tools. This integration removes transfer time and positioning overhead, achieving continuous inspection that does not add significant downtime while maintaining high defect detection capability.
3Ease of manufacture
If multiple separate tools are used for cleaning, inspection, and bonding, then each tool can be optimized for its specific function, but substrate transfer between tools increases complexity and potential for contamination
Solution Approach 1:
The patent merges cleaning chambers, metrology systems, and bonder chambers into a single integrated tool with shared vacuum infrastructure and substrate handling mechanisms. This reduces the number of inter-tool transfers, minimizing contamination risks and simplifying the overall system architecture while maintaining specialized functionality through dedicated chambers within the unified tool.
4Manufacturing precision
If pre-bond inspection is performed to detect defects, then bonding quality is improved, but process time increases due to additional inspection steps
Solution Approach 1:
The patent performs pre-bond inspection of substrates and chiplets for defects (particulates, cracks, chips, misalignment) before the bonding process. By detecting and flagging defective components beforehand, the system prevents rework and ensures high bonding quality. The inspection is integrated into the process flow without requiring separate processing steps.
Solution Approach 2:
The pre-bond inspection is performed continuously as substrates and chiplets are loaded into the tool, before they enter the bonding chamber. This continuous inspection approach does not interrupt the bonding process flow and maintains steady-state operation, minimizing additional process time while ensuring high bonding quality through comprehensive defect detection.
Data Source
AI summary
Methods and apparatus 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.