Vacuum Pipe Conductance Matching for Uniform Semiconductor Chambers
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Solution Overview
Problem
Semiconductor fabrication systems face challenges in achieving uniform performance across multiple process chambers, leading to variations in fabrication yield due to differences in vacuum pipe conductance and pump placement configurations.
Innovation Solution
The method involves designing and connecting vacuum pipes with equal total conductance, regardless of shape or length, to ensure uniform fluid flow between process chambers and pumps, allowing for flexible placement and reduced performance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vacuum pipes of different shapes and lengths are used to connect process chambers to pumps, then flexibility in chamber and pump placement is improved, but performance uniformity between chambers deteriorates due to varying conductance
Solution Approach 1:
The patent applies parameter changes by adjusting the conductance values of vacuum pipes to compensate for differences in pipe shape and length. Specifically, pipes with different geometries are designed with different conductance parameters so that the overall vacuum flow characteristics remain uniform across all process chambers, resolving the contradiction between placement flexibility and performance uniformity
Solution Approach 2:
The patent implements equipotentiality by ensuring that all process chambers operate under equivalent vacuum conditions through careful design of vacuum pipe conductance. By making the conductance values equivalent across different pipe configurations, the system achieves uniform performance despite variations in chamber and pump placement
2Ease of manufacture
If vacuum pipe conductance is not standardized, then ease of installation is improved, but fabrication yield deteriorates due to performance variation between chambers
Solution Approach 1:
The patent standardizes the conductance parameter of vacuum pipes while allowing other installation parameters to vary. This approach maintains ease of installation through flexible positioning while ensuring uniform performance across chambers by controlling the conductance parameter, thereby improving fabrication yield
3Ease of operation
If process chambers are spaced apart for accessibility, then ease of operation is improved, but vacuum system performance uniformity deteriorates due to increased pipe length and conductance variation
Solution Approach 1:
The patent compensates for the negative effects of increased pipe length resulting from chamber spacing by adjusting the conductance parameter of the vacuum pipes. Longer pipes are designed with higher conductance values to maintain uniform vacuum flow characteristics, enabling both good accessibility and performance uniformity
Data Source
AI summary
A method of manufacturing a semiconductor fabrication system may include preparing a first vacuum pipe, preparing a second vacuum pipe, connecting a first process chamber to a first pump through the first vacuum pipe, and connecting a second process chamber, which is spaced apart from the first process chamber, to a second pump through the second vacuum pipe. The preparing of the first vacuum pipe may include connecting a plurality of first unit pipes to form the first vacuum pipe and calculating a first conductance, which is a total conductance of the first vacuum pipe. The preparing of the second vacuum pipe may include forming the second vacuum pipe by connecting a plurality of second unit pipes such that the second conductance, which is a total conductance of the second vacuum pipe, is equal to the first conductance.