Focus Ring Grading for Plasma Uniformity
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Solution Overview
Problem
Current substrate processing technologies face challenges in uniformly controlling plasma in the edge region and optimizing component usage for specific processes, leading to reduced yield and inefficiencies.
Innovation Solution
A substrate processing apparatus and method that classify focus rings and other components by grade based on grain size and electrical resistivity, allowing for the selection of suitable components for each process, ensuring uniform plasma control and appropriate component usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If focus rings are used for substrate treatment processes, then plasma control is improved, but uniformity of plasma in the edge region deteriorates
Solution Approach 1:
The focus ring is designed with different grain sizes in different regions: a first region with a first grain size and a second region with a second grain size different from the first. This local variation in grain size creates local quality differences that enable uniform plasma control across the entire substrate surface, including the edge region where uniformity was previously problematic.
2Productivity
If components are used without classification by grade, then device complexity is reduced, but yield deteriorates
Solution Approach 1:
Focus rings are pre-classified into multiple grades based on grain size characteristics before being used in substrate treatment processes. This preliminary classification ensures that the appropriate grade of focus ring is selected for each specific process requirement, thereby improving yield without requiring complex real-time decision-making during operation.
Solution Approach 2:
The invention introduces grain size as a critical classification parameter for focus rings. By establishing clear parameter thresholds for different grades (e.g., first grain size for first grade, second grain size for second grade), the system enables systematic component selection that improves process outcomes while maintaining manageable complexity through standardized classification criteria.
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 approach enhances yield by ensuring high-quality components are used for demanding processes and prevents waste by matching component grades with process requirements, while maintaining uniform plasma control in the edge region.
Implementation Method 1
A substrate processing apparatus and method that classify focus rings and other components by grade based on grain size and electrical resistivity, allowing for the selection of suitable components for each process, ensuring uniform plasma control
Data Source
AI summary
A substrate processing method includes classifying a kind of substrate treatment process in which a focus ring is used, classifying a plurality of focus rings, selecting from the classified plurality of focus rings a specific focus ring suitable for a certain substrate treatment process corresponding to the classified kind of substrate treatment process, and performing the certain substrate treatment process using the selected specific focus ring. The operation of classifying the plurality of focus rings includes classifying the plurality of focus rings into two or more grades.