Circular Substrate Transfer for Parallel CMP Processing
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Solution Overview
Problem
The semiconductor manufacturing process faces inefficiencies in the CMP process due to the need for sequential and time-consuming substrate transfer, polishing, and cleaning, which hampers production efficiency and yield rate.
Innovation Solution
A substrate polishing system that integrates simultaneous transferring, polishing, and cleaning capabilities through a circular transfer orbit mechanism, utilizing a substrate transfer unit, carrier, loader, and stage portion with nozzles to maintain substrate stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential substrate transfer, polishing, and cleaning processes are used, then each process can be performed with dedicated equipment, but the total processing time increases and production efficiency decreases
Solution Approach 1:
The patent combines substrate transfer, polishing, and cleaning functions into a single integrated apparatus. The substrate transfer unit moves substrates between processing positions while the polishing unit performs CMP operations and the cleaning unit removes residues, all within one system. This merging eliminates the need for multiple separate equipment pieces and reduces substrate transfer time between processes, thereby improving production efficiency while maintaining process stability through coordinated operation of all units.
Solution Approach 2:
The integrated apparatus performs multiple functions simultaneously: substrate transfer, polishing, and cleaning. The substrate transfer unit can position substrates at different locations for various operations, the polishing unit provides CMP functionality, and the cleaning unit removes processing residues. This multi-functionality allows a single apparatus to replace multiple dedicated equipment pieces, reducing overall processing time and improving productivity.
2Ease of manufacture
If substrate is transferred between multiple processes, then each process can be optimized independently, but the substrate may experience state changes or contamination during transfer and waiting
Solution Approach 1:
By combining transfer, polishing, and cleaning into one apparatus, the substrate remains within a controlled environment throughout the entire process. The substrate transfer unit moves substrates between integrated processing positions without exposing them to external contamination risks. This merging ensures substrate state stability while still allowing each unit to be independently optimized for its specific function.
3Manufacturing precision
If multiple substrates are processed sequentially, then each substrate receives full attention, but the total processing time increases significantly
Solution Approach 1:
The substrate transfer unit dynamically moves substrates between different processing positions within the integrated apparatus. While one substrate is being polished, the transfer unit can prepare the next substrate for loading, and the cleaning unit can prepare for the next cleaning operation. This dynamic coordination allows multiple substrates to be processed in overlapping time periods, increasing throughput while maintaining polishing quality through dedicated polishing functionality.
Solution Approach 2:
The integrated apparatus enables continuous processing by eliminating idle time between operations. The substrate transfer unit continuously moves substrates between positions, the polishing unit continuously performs CMP operations when substrates are present, and the cleaning unit continuously removes residues. This continuity of useful action across all units allows multiple substrates to be processed in parallel, significantly increasing throughput while maintaining manufacturing precision.
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 system reduces processing time and enhances yield rate by maintaining substrate stability during transfer, waiting, and cleaning, enabling parallel processing of multiple substrates.
Implementation Method 1
The loader may include a first nozzle to spray a fluid.
Data Source
AI summary
A substrate polishing system may include a substrate transfer unit to support a bottom surface of a substrate and transfer the substrate while forming a transfer orbit in a circle by a rotational motion, at least one carrier to perform polishing on the substrate received from the substrate transfer unit, and a loader to load the substrate which is seated on the substrate transfer unit to the carrier or unload a substrate placed on the carrier to the substrate transfer unit.