Multi-Tiered Substrate Cleaning and Inspection Interface
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Solution Overview
Problem
The challenge is to reduce the footprint of a substrate treatment system used in semiconductor manufacturing while maintaining the effectiveness of cleaning the rear surface of substrates before exposure, without altering the configuration of existing treatment units.
Innovation Solution
The system incorporates a treatment station with multiple-tiered cleaning and inspection units at the interface station, along with a substrate transfer mechanism using an arm to transfer substrates between these units, allowing for efficient cleaning and inspection before exposure, thereby reducing the system's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cleaning unit and inspection unit are provided separately on front and back sides, then substrate can be cleaned and inspected, but interface station size increases
Solution Approach 1:
The patent applies vertical stacking of cleaning units and inspection units in the up-down direction (vertical dimension) instead of arranging them horizontally on front and back sides. This dimensional transition from horizontal to vertical arrangement reduces the horizontal footprint of the interface station while maintaining all necessary cleaning and inspection functions.
Solution Approach 2:
The patent nests multiple cleaning units and inspection units within a compact vertical structure at the interface station. By stacking these units vertically and positioning the substrate transfer mechanism in the adjacent horizontal region, the system achieves space-efficient nesting that minimizes overall interface station area.
2Area of stationary object
If multiple-tiered cleaning and inspection units are stacked vertically, then footprint is reduced, but substrate transfer complexity increases
Solution Approach 1:
The substrate transfer mechanism employs dynamic positioning capability with the arm movable in vertical direction to adapt to multiple-tiered cleaning and inspection units. This dynamic adjustment allows the transfer mechanism to service vertically stacked units efficiently, managing the complexity through flexible, adaptive motion control.
Solution Approach 2:
The substrate transfer mechanism with vertically movable arm serves multiple functions: transferring substrates between different vertical tiers, positioning substrates for cleaning, and positioning substrates for inspection. This multi-functionality consolidates what would otherwise require separate mechanisms, managing complexity through universal design.
3Area of stationary object
If cleaning unit configuration is changed to reduce footprint, then interface station size decreases, but treatment unit configuration constraint is violated
Solution Approach 1:
The patent resolves the configuration constraint by transitioning the arrangement dimension from horizontal to vertical. This allows the cleaning and inspection units to maintain their functional configurations while being stacked vertically, thus reducing footprint without violating treatment unit configuration requirements.
Data Source
AI summary
In a coating and developing treatment system including a treatment station and an interface station, the interface station has: a cleaning unit cleaning a rear surface of a wafer before the wafer is transferred into an exposure apparatus; an inspection unit inspecting whether the cleaned wafer is in an exposable state; and a wafer transfer mechanism including an arm transferring the wafer between the cleaning unit and the inspection unit. Each of the cleaning unit and the inspection unit is provided at multiple tiers in an up and down direction on the front side in the interface station, and the wafer transfer mechanism is provided in a region adjacent to the cleaning units and the inspection units.