Dual-Zone TEOS Gas Blocker for PECVD Deposition Uniformity
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Solution Overview
Problem
Plasma enhanced chemical vapor deposition (PECVD) techniques face challenges in achieving uniform deposition rates across the substrate due to varying plasma densities, particularly between the center and edge, caused by inefficient gas distribution.
Innovation Solution
A processing chamber design with a dual-zone gas blocker and concentric gas distribution plates that independently control the flow of gas mixtures, ensuring uniform plasma formation by separating the substrate processing region into inner and outer gas zones, allowing precise control of TEOS and oxygen-containing gases to enhance plasma density and deposition uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single gas distribution system is used, then the device complexity is low, but the deposition uniformity across the substrate deteriorates due to varying plasma densities between center and edge
Solution Approach 1:
The gas distribution system is divided into multiple independent zones: a first gas distribution system serving a first region of the substrate and a second gas distribution system serving a second region. Each system can independently control gas flow rates and compositions, allowing separate optimization of plasma density and deposition characteristics for different substrate areas, thereby achieving uniform deposition across the entire substrate despite the increased system complexity.
2Manufacturing precision
If gas flow is not independently controlled, then the gas distribution system is simple, but the plasma density varies across the substrate causing non-uniform deposition rates
Solution Approach 1:
The gas distribution system incorporates dynamic control capabilities through independent gas flow controllers for each region. These controllers can adjust gas flow rates in real-time based on process requirements, enabling independent optimization of plasma density and deposition rate for different substrate regions. This dynamic control ensures uniform deposition across the substrate while accommodating the complexity through automated control mechanisms.
3Adaptability or versatility
If a single gas source is used for the entire substrate, then the gas source complexity is low, but the ability to control deposition profiles independently in different regions is limited
Solution Approach 1:
The gas source system is segmented into multiple independent gas sources or independently controllable gas delivery channels, with each source dedicated to a specific substrate region. This segmentation enables independent control of gas composition and flow rate for each region, providing the versatility to create different deposition profiles (e.g., varying film thickness, composition, or properties) across different areas of the substrate, while the modular architecture manages the inherent complexity.
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
The solution achieves uniform deposition rates across the substrate by maintaining TEOS concentration and plasma density, promoting uniform film deposition and allowing for adjustable film profiles without affecting film properties, thereby addressing the issue of varying deposition rates.
Implementation Method 1
A processing chamber design with a dual-zone gas blocker and concentric gas distribution plates that independently control the flow of gas mixtures
Implementation Method 2
The precursor gas in the chamber is energized (e.g., excited) to form a plasma by applying RF power to the chamber from one or more RF sources coupled to the chamber
Implementation Method 3
The excited gas reacts to form a layer of material on a surface of the substrate that is positioned on a temperature controlled substrate support
Data Source
AI summary
In one embodiment, at least a processing chamber includes a perforated lid, a gas blocker disposed on the perforated lid, and a substrate support disposed below the perforated lid. The gas blocker includes a gas manifold, a central gas channel formed in the gas manifold, a first gas distribution plate comprising an inner and outer trenches surrounding the central gas channel, a first and second gas channels formed in the gas manifold, the first gas channel is in fluid communication with a first gas source and the inner trench, and the second gas channel is in fluid communication with the first gas source and the outer trench, a second gas distribution plate, a third gas distribution plate disposed below the second gas distribution plate, and a plurality of pass-through channels disposed between the second gas distribution plate and the third gas distribution plate. The second gas distribution plate includes a plurality of through holes formed through a bottom of the second gas distribution plate, a central opening in fluid communication with the central gas channel, and a recess region formed in a top surface of the second gas distribution plate, and the recess region surrounds the central opening.