Laminated Ceramic Chamber Parts for Plasma Window Degradation
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Solution Overview
Problem
Dielectric windows in semiconductor processing chambers degrade due to plasma exposure, leading to contamination and visual color changes, which can cause device failures and quality assurance concerns, especially with laminated ceramic parts having small pits that are difficult to clean.
Innovation Solution
A method involving a ceramic component with a base zone, a protective zone, and a transition zone, where exposure to UV light and subsequent heat treatment between 400° C to 1000° C for 2-20 hours alters optical properties and reduces debris in pits less than 5 microns, including decontamination processes and nanotexturing to improve surface cleanliness and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric windows are used in plasma processing chambers, then power can be transmitted into the chamber, but the windows degrade and change color due to plasma exposure
Solution Approach 1:
The patent applies composite materials by creating a laminated ceramic structure with multiple zones (base zone, protective zone, transition zone) containing different dielectric ceramic materials. This composite structure allows the protective zone to resist plasma degradation while the base zone maintains optical properties, thereby resolving the contradiction between window durability and plasma resistance.
Solution Approach 2:
The patent implements local quality by assigning different material properties to different zones of the ceramic window. The protective zone facing the plasma has enhanced plasma resistance, the base zone maintains optical transmission, and the transition zone provides a gradient interface. This localized differentiation allows each zone to optimize for its specific function, resolving the degradation issue.
2Manufacturing precision
If laminated ceramic parts are manufactured with small pits less than 5 microns in width, then manufacturing precision is improved, but debris removal becomes difficult
Solution Approach 1:
The patent applies preliminary action by performing UV light exposure and heat treatment on the ceramic component before it is installed in the plasma chamber. This pre-treatment process removes debris from the small pits and stabilizes the optical properties, eliminating the need for difficult post-manufacturing cleaning operations while maintaining high manufacturing precision.
Solution Approach 2:
The patent replaces mechanical cleaning methods with a combination of UV light exposure and thermal treatment. This substitution allows for effective debris removal from sub-5-micron pits without requiring physical access or mechanical intervention, thereby resolving the contradiction between manufacturing precision and ease of maintenance.
3Manufacturing precision
If heat treatment is applied to restore optical properties, then appearance quality is improved, but processing time increases
Solution Approach 1:
The patent performs the heat treatment as a preliminary action during the manufacturing or reconditioning process, before the component is installed in the plasma chamber. This timing allows the full benefit of optical property restoration to be achieved without delaying operational timelines, as the treatment is completed during scheduled maintenance or manufacturing cycles rather than during production.
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 method effectively reduces contamination and optical property changes, improving the reliability and appearance of ceramic components in semiconductor processing chambers by minimizing debris in small pits and restoring uniform optical properties.
Implementation Method 1
exposure of the ceramic component to UV light changes an optical property of at least a first part of the ceramic component from a first optical state to a second optical state
Implementation Method 2
A heat treatment of the ceramic component is provided by heating the ceramic component in a furnace to a temperature of between 400° C. to 1000° C. for a period between 2 hours to 20 hours, wherein the heat treatment changes the optical property of the first part of the ceramic component from the second optical state to a third optical state
Data Source
AI summary
A method for treating a ceramic component for use in a semiconductor processing chamber, wherein the ceramic component comprises a ceramic laminate comprising a base zone comprising a first dielectric ceramic material, a protective, wherein the protective zone comprises a second dielectric ceramic material, and a transition zone between the protective zone and base zone, wherein the transition zone comprises the first dielectric ceramic material and the second dielectric ceramic material, wherein exposure of the ceramic component to UV light changes an optical property of at least a first part of the ceramic component is provided. A heat treatment of the ceramic component is provided by heating the ceramic component in a furnace to a temperature of between 400° C. to 1000° C. for a period between 2 hours to 20 hours, wherein the heat treatment changes the optical property of the first part of the ceramic component.