Vacuum Deposition Source Layout for Dense Low-Pressure Plasma
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Solution Overview
Problem
Conventional PECVD systems face challenges such as low plasma density, high process pressures, low material utilization, powder formation, and deposition on plasma sources, which lead to inefficiencies and increased waste, particularly in roll-to-roll web processing where in-situ cleaning is impractical.
Innovation Solution
A high throughput deposition apparatus with a rotating workpiece platform, magnetron apparatus forming a closed-loop magnetic field, and an evaporation source that minimizes deposition on sources, allowing multiple workpieces to be processed simultaneously with reduced gas phase reactions and waste, using the workpieces as primary deposition sources and eliminating separate deposition sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If PECVD is applied between parallel plates to achieve good uniformity, then deposition uniformity is improved, but plasma density is low and process pressure is high
Solution Approach 1:
The invention divides the deposition system into multiple independent plasma sources arranged in an array, where each source deposits material onto a portion of the substrate. This segmentation allows each plasma source to operate at optimized conditions with sufficient plasma density while collectively achieving uniform deposition across the entire substrate surface.
Solution Approach 2:
The invention transitions from a two-dimensional parallel plate geometry to a three-dimensional array of plasma sources positioned at different locations and angles relative to the substrate. This dimensional change enables better plasma confinement and higher plasma density at each source while maintaining overall deposition uniformity through geometric arrangement.
2Manufacturing precision
If PECVD is applied between parallel plates to achieve good uniformity, then deposition uniformity is improved, but process pressure is high
Solution Approach 1:
By segmenting the deposition into multiple localized plasma sources, each operating at lower pressure with better plasma confinement, the system achieves the required deposition uniformity without needing to maintain high overall process pressure in the chamber.
Solution Approach 2:
The invention introduces magnetic fields as an intermediary to confine and control the plasma at each source location, enabling stable plasma operation at lower pressures and reducing the need for high process pressure to maintain plasma stability.
3Stability of the object's composition
If high process pressure is used to maintain stable plasma, then plasma stability is improved, but material utilization is low and powder formation increases
Solution Approach 1:
The invention extracts and removes excess gas phase reactions and powder formation from the deposition process by using localized plasma sources with better confinement, allowing the system to operate at lower pressures where material utilization is improved and unwanted side reactions are minimized.
Solution Approach 2:
The invention changes the operational parameters of each plasma source to operate at optimized power densities and gas flow rates that enhance material utilization efficiency while maintaining plasma stability, reducing the need for high overall process pressure.
4Productivity
If deposition occurs on plasma sources, then deposition rate is improved, but particulates formation and clogging of gas distribution holes occur
Solution Approach 1:
The invention employs disposable or easily replaceable plasma source components that can be quickly changed when deposition occurs on them, allowing continuous operation without lengthy cleaning processes and eliminating the harmful effects of deposited material on plasma source performance.
Solution Approach 2:
The system is designed to discard plasma sources that have accumulated deposition and recover the deposition material from the substrates, converting what would be waste into usable product and eliminating the need for complex in-situ cleaning of plasma sources.
5Manufacturing precision
If in-situ cleaning of plasma sources is performed, then deposition on sources is reduced, but processing time increases
Solution Approach 1:
The invention uses disposable plasma source components that are replaced rather than cleaned, eliminating the time-consuming in-situ cleaning process while ensuring plasma source cleanliness for each production run.
Solution Approach 2:
The system performs preliminary deposition on sacrificial plasma source components before the actual substrate processing, so that any problematic deposition occurs on the disposable components rather than on the substrates, eliminating the need for cleaning between substrate processing cycles.
6Productivity
If multiple workpieces are processed simultaneously, then productivity is improved, but deposition on deposition sources increases
Solution Approach 1:
By segmenting the plasma sources into multiple independent units arranged in an array, the system can process multiple workpieces simultaneously while directing deposition primarily onto the workpieces rather than accumulating material on the plasma sources themselves, as each source is optimized for its specific workpiece.
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 solution enhances gas utilization, reduces waste treatment, increases system productivity, and extends the lifetime of deposition equipment by minimizing deposition on sources and chambers, while maintaining plasma stability and uniformity.
Implementation Method 1
Magnet field can bend electrons in plasma, increase ionizations, increase plasma density and decrease operating pressure
Implementation Method 2
Magnet field can bend electrons in plasma
Implementation Method 3
an evaporation source that can provide a vapor gas in the center region of the process chamber to deposit a material on the deposition surfaces
Implementation Method 4
The plurality of workpieces are electrically biased to produce a plasma near the deposition surfaces on the plurality of workpieces
Implementation Method 5
PECVD is often applied between parallel plates to achieve good uniformity
Data Source
AI summary
A versatile high throughput deposition apparatus includes a process chamber and a workpiece platform in the process chamber. The workpiece platform can hold a plurality of workpieces around a center region and to rotate the plurality of workpieces around the center region. Each of the plurality of workpieces includes a deposition surface facing the center region. A gas distribution system can distribute a vapor gas in the center region of the process chamber to deposit a material on the deposition surfaces on the plurality of workpieces. A magnetron apparatus can form a closed-loop magnetic field near the plurality of workpieces. The plurality of workpieces can be electrically biased to produce a plasma near the deposition surfaces on the plurality of workpieces.