Conductive Chamber Coating for Stable Plasma Processing
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Solution Overview
Problem
Plasma processing in chambers leads to damage of inner walls due to ion and radical collisions, and existing protective films, if insulating, hinder electron exchange between plasma and electrodes, causing process instability.
Innovation Solution
A method involving coating chamber components with a conductive film formed from a gas mixture containing carbon and hydrogen, which stabilizes the plasma processing by enhancing conductive properties and preventing component damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a protective film is formed on the inner wall of the chamber, then damage to the inner wall from ion and radical collisions is reduced, but electron exchange between plasma and electrodes is hindered, causing process instability
Solution Approach 1:
The patent changes the electrical conductivity parameter of the protective film by selecting specific materials (such as tungsten, molybdenum, or their alloys) that inherently possess conductive properties. This allows the film to simultaneously protect the chamber wall and maintain electron exchange with plasma, resolving the contradiction between physical protection and electrical functionality
Solution Approach 2:
The patent employs composite or alloy materials (e.g., tungsten-rhenium, molybdenum-based alloys) for the protective film that combine high resistance to ion/radical damage with good electrical conductivity. These composite materials integrate multiple functions: mechanical protection and electrical conduction, thereby eliminating the trade-off between protection and process stability
2Duration of action of stationary object
If existing protective films are used to protect chamber components, then component damage is reduced, but electron exchange between plasma and electrodes is hindered
Solution Approach 1:
The patent modifies the electrical parameter (conductivity) of the protective film by selecting conductive materials, enabling continuous electron exchange between plasma and electrodes while maintaining component protection over extended periods, thus resolving the contradiction between durability and energy efficiency
Solution Approach 2:
The conductive protective film acts as an intermediary layer that facilitates rather than hinders electron exchange. By choosing materials with appropriate conductivity, the film mediates between the plasma environment and the chamber components, allowing electron transfer while providing physical protection
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 conductive film stabilizes the plasma processing, reduces component consumption, and maintains desired process outcomes by preventing ion penetration and ensuring effective electron exchange.
Implementation Method 1
coating surfaces of components inside a chamber with a film having conductive properties by turning a first gas containing carbon and hydrogen into plasma inside the chamber
Implementation Method 2
processing the substrate by turning a second gas into plasma inside the chamber in a state where the surfaces of the components inside the chamber are coated with the film having conductive properties
Data Source
AI summary
A method of processing a substrate with plasma includes: coating surfaces of components inside a chamber with a film having conductive properties by turning a first gas containing carbon and hydrogen into plasma inside the chamber; loading the substrate into the chamber; and processing the substrate by turning a second gas into plasma inside the chamber in a state where the surfaces of the components inside the chamber are coated with the film having conductive properties.