Localized Plasma Control via Multi-Zoned Gas Injection
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Solution Overview
Problem
Plasma processing of semiconductor substrates faces challenges in achieving uniformity across localized regions, particularly at the edge of substrates, leading to variations in deposition rates, etch rates, selectivity, and anisotropy, which affect critical dimension control.
Innovation Solution
The implementation of localized plasma control methods using multi-zoned gas injection systems to direct reactive gases to specific regions of the substrate, while using inert gases to restrict their spread, and adjusting process variables like pressure, power, and temperature to maintain these conditions, allowing for separate plasma processing steps focused on edge regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-zoned gas injection system is implemented to provide localized plasma control, then regional plasma uniformity improves, but system complexity increases
Solution Approach 1:
The gas injection system is divided into discrete zones (edge, middle, center) with independent control capabilities. This segmentation enables localized plasma uniformity optimization while maintaining a manageable system architecture where each zone can be controlled independently through dedicated gas delivery channels and flow control mechanisms.
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 critical dimension control and uniformity across substrates by precisely managing plasma conditions at specific regions, improving edge-to-center uniformity and reducing polymerization-related non-uniformities.
Implementation Method 1
The plasma systems may be typically utilized for plasma etching and/or plasma deposition
Implementation Method 2
The plasma systems may be typically utilized for plasma etching and/or plasma deposition
Implementation Method 3
a reactive gas may be maintained in a localized region of a substrate while other regions of the substrate are not exposed to such reactive gas
Data Source
AI summary
Plasma processing conditions may be changed for localized regions of a substrate. A reactive gas may be maintained in a localized region of a substrate while other regions of the substrate are not exposed to the reactive gas. Thus, plasma conditions may be generated at specific regions of the substrate. A multi-zoned gas injection system may be utilized to direct certain gases in certain regions of the plasma space. Techniques may be provided to maintain these gases in the desired regions, as opposed to the gases spreading across the substrate surface. Reactive gases may be provided in one region while a flow of inert gas is provided in other regions in which it is desired to restrict the effects of the reactive gases. Localized control of the plasma process may be provided as a separate plasma processing step. The localized region of the substrate may be the substrate edge.