RF Power Transmission Paths for Plasma Density Profile Control
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Solution Overview
Problem
Existing semiconductor wafer fabrication processes face challenges in controlling plasma density profiles, leading to center-to-edge uniformity issues and variations in die yield due to indirect compensation methods for uncontrolled plasma density.
Innovation Solution
A plasma processing system with a radiofrequency (RF) power source, matching network, and tuning elements that allow direct control of RF power transmission paths to adjust plasma density profiles over the wafer surface, using spatially dispersed RF power transmission paths and computing systems to maintain target plasma density profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If indirect compensation methods are used to control wafer uniformity by adjusting process parameters, then wafer uniformity can be partially improved, but plasma density profile control remains uncontrolled and center-to-edge uniformity problems persist
Solution Approach 1:
The plasma generation system is segmented into multiple independent RF power transmission paths, each capable of being controlled separately. This allows the plasma density profile to be divided into controllable regions, enabling direct manipulation of plasma density distribution across the wafer surface without requiring complex indirect compensation mechanisms.
Solution Approach 2:
The system employs dynamically adjustable RF power transmission paths with tuning elements that can be modified in real-time during plasma generation. This dynamic control capability allows the plasma density profile to be actively adjusted and optimized, providing direct control over wafer uniformity rather than relying on static indirect compensation.
2Manufacturing precision
If multiple RF power transmission paths with tuning elements are implemented to directly control plasma density profile, then plasma density control precision is improved, but device complexity increases
Solution Approach 1:
The RF power transmission system is divided into multiple independent paths, each with its own tuning elements. This segmentation allows precise local control of plasma density in different regions while maintaining modular architecture that simplifies overall system management compared to a monolithic complex system.
Solution Approach 2:
Each RF power transmission path is equipped with local tuning elements that can be independently adjusted to achieve the desired plasma density profile. This local quality approach allows precise control of plasma density at specific locations without requiring complex global control mechanisms, simplifying the overall system design.
3Manufacturing precision
If RF power transmission paths are spatially dispersed throughout the plasma volume, then plasma density uniformity across the wafer is improved, but system complexity and difficulty of control increases
Solution Approach 1:
The plasma volume is divided into multiple zones with dedicated RF power transmission paths spatially dispersed throughout. Each segmented path can be independently controlled to achieve uniform plasma density distribution, and the modular segmented architecture actually simplifies control compared to attempting to manage the entire plasma volume as a single unit.
Solution Approach 2:
Each spatially dispersed RF power transmission path is optimized for its specific location in the plasma volume, providing local quality control. This allows each path to be tuned independently for optimal performance in its region, making the overall system easier to control by breaking down the complex task of plasma uniformity into manageable local adjustments.
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 enables direct control of plasma density profiles, improving wafer uniformity and die yield by ensuring consistent plasma-to-substrate reactions across the wafer surface, thereby enhancing process uniformity and flexibility.
Implementation Method 1
a radiofrequency (RF) power source and a matching network connected to the RF power source. A transmit electrode is connected to the matching network and is defined to transmit RF power to a plasma to be generated within a volume
Implementation Method 2
exposing a wafer to a plasma to allow the reactive constituents of the plasma to modify the surface of the wafer
Data Source
AI summary
A number of RF power transmission paths are defined to extend from an RF power source through a matching network, through a transmit electrode, through a plasma to a number of return electrodes. A number of tuning elements are respectively disposed within the number of RF power transmission paths. Each tuning element is defined to adjust an amount of RF power to be transmitted through the RF power transmission path within which the tuning element is disposed. A plasma density within a vicinity of a particular RF power transmission path is directly proportional to the amount of RF power transmitted through the particular RF power transmission path. Therefore, adjustment of RF power transmitted through the RF power transmission paths, as afforded by the tuning element, enables control of a plasma density profile across a substrate.