Vertically Distributed I/O Ports for Semiconductor Cassette Storage
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Solution Overview
Problem
Semiconductor fabrication systems face bottlenecks in throughput due to limitations in the supply of unprocessed substrates, as processing systems can operate more quickly than substrates can be delivered through access ports, leading to idle reactors and reduced system efficiency.
Innovation Solution
The implementation of a semiconductor substrate processing system with multiple vertically distributed input/output ports and storage positions, allowing for increased cassette availability and efficient transport of substrates, while maintaining compatibility with existing systems and preserving valuable floor space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple vertically distributed input/output ports and storage positions are implemented, then cassette availability and throughput are increased, but device complexity increases
Solution Approach 1:
The patent applies vertical dimensionality by distributing input/output ports and storage positions across multiple vertical levels within the housing. This allows cassettes to be accessed from different heights, increasing storage capacity and cassette availability without expanding the horizontal footprint, thereby improving throughput while managing system complexity through spatial optimization.
2Quantity of substance
If vertically distributed storage positions are added, then cassette storage capacity is increased, but the use of floor space is constrained
Solution Approach 1:
The invention transitions from horizontal to vertical spatial organization by implementing multiple levels of storage positions at different heights within the housing. This vertical stacking approach maximizes cassette storage capacity within the available vertical envelope, effectively increasing storage density without requiring additional floor space.
3Productivity
If additional input/output ports are provided at different vertical levels, then cassette supply rate is improved, but system complexity increases
Solution Approach 1:
The system segments the cassette supply function across multiple independent input/output ports located at different vertical levels. Each port can independently receive and supply cassettes, distributing the supply rate across parallel channels. This segmentation increases overall cassette throughput while managing complexity by modularizing the I/O architecture.
Solution Approach 2:
By distributing input/output ports across vertical levels rather than concentrating them at a single level, the system creates multiple access points that can operate simultaneously. This vertical distribution increases cassette supply rate by enabling parallel cassette handling while organizing complexity in a structured spatial framework.
Data Source
AI summary
A system for processing semiconductor substrates includes a front-end with at least two vertical levels of input/output ports for transferring substrate cassettes into or out of the housing of the processing system. The front-end also includes at least one level of storage positions, e.g., two levels of storage positions, which can be disposed between the two vertical levels of the input/output ports. The two vertical levels of storage positions can each be provided with two storage positions and each of two levels of input/output ports can be provided with accommodations for two cassettes, allowing for a total of eight cassettes to be accommodated at the front-end of the processing system. Inside the housing of the processing system, interior storage positions can be provided adjacent a wafer handling chamber and spaced apart from a cassette store having rotary platforms for housing cassettes. A single cassette handler can be used to access cassettes at each of the input/output ports and the interior storage positions.