Semiconductor Substrate Transfer Sequence Balancing
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Solution Overview
Problem
The productivity of semiconductor device manufacturing is reduced due to mismatches between the number of process chambers in a processing apparatus and the number of processed wafers, leading to inefficiencies and variations in film characteristics across different chambers.
Innovation Solution
A substrate processing system with multiple processing units, a vacuum transfer chamber, a load lock chamber, and transfer robots that systematically transfer substrates between storage units and processing chambers, ensuring balanced usage of chambers and improved processing uniformity by controlling the transfer sequence and placement surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If substrates are processed in multiple process chambers to improve productivity, then manufacturing efficiency increases, but mismatches between chamber count and wafer count cause productivity reduction and film characteristic variations
Solution Approach 1:
The system pre-arranges substrate storage in multiple storage units (first, second, third storage units) and establishes a predetermined transfer sequence before processing begins. This preliminary organization enables systematic substrate distribution across process chambers, ensuring balanced usage and consistent film characteristics while maintaining high productivity
Solution Approach 2:
The processing system is divided into multiple independent process chambers (first, second, third chambers) with dedicated storage units and transfer robots for each. This segmentation allows parallel processing of multiple substrates simultaneously, improving productivity while maintaining uniform film characteristics through controlled substrate allocation to each chamber
2Quantity of substance
If the number of process chambers is increased to handle more wafers, then processing capacity improves, but chamber usage becomes unbalanced leading to reduced productivity
Solution Approach 1:
The system implements a feedback mechanism where the control unit monitors substrate processing status and chamber availability, then dynamically adjusts the transfer sequence to balance chamber usage. This ensures optimal utilization of all process chambers regardless of the number of wafers being processed, maintaining high productivity
3Speed
If transfer sequences are not controlled systematically, then processing speed increases, but film characteristic variations occur across chambers
Solution Approach 1:
The control unit pre-determines the optimal transfer sequence for substrates from storage units to process chambers before processing begins. This preliminary planning ensures that substrates are distributed systematically across chambers in a controlled manner, maintaining film characteristic consistency while enabling rapid parallel processing
Solution Approach 2:
The system employs dynamic transfer robots that can adaptively move substrates between storage units and process chambers based on real-time chamber status and processing requirements. This dynamic adjustment maintains optimal processing speed while ensuring uniform film characteristics through controlled substrate allocation
Data Source
AI summary
The present invention provides a technique for improving the productivity of a processing apparatus including a plurality of process chambers. There is provided a technique including a method for manufacturing a semiconductor device including: (a) transferring a last remaining substrate stored in an xth storage unit of a plurality of storage units to an empty nth chamber in an mth processing unit of a plurality of processing units; and (b) transferring a first one of a plurality of substrates stored in an (x+1)th storage unit of the plurality of storage units to one of chambers in an (m+1)th processing unit of the plurality of processing units (where x, m and n are natural numbers).