SiC Ceramic Wafer Chuck Coating for Dusting and Wear Control
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Solution Overview
Problem
Ceramic wafer chucks used in semiconductor manufacturing suffer from dusting issues due to microcracks, leading to circuit failures and reduced durability, especially when polycrystalline diamond or hard carbon films are applied only on the surface, not the side or back surfaces, and heat treatment for oxide formation compromises mechanical strength and friction.
Innovation Solution
A ceramic wafer chuck with an oxidation-treated layer and a diamond-like carbon (DLC) film on its outermost surface is developed, where the ceramic base is treated at 300° C. to 700° C. to form an oxide layer, followed by a DLC film to enhance adhesion and reduce dusting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a polycrystalline diamond film or hard carbon film is formed on the wafer chuck surface, then dusting is reduced on the surface, but dusting cannot be reduced on side surfaces or back surfaces where the film is not formed
Solution Approach 1:
The solution segments the dusting prevention approach by applying different treatments to different surfaces: oxidation treatment for side and back surfaces, and DLC film formation for the wafer-contact surface. This segmented approach allows each surface to receive the most appropriate treatment for its specific functional requirements.
Solution Approach 2:
The invention applies local quality by using oxidation treatment specifically on side and back surfaces where dusting occurs but DLC film is not applied, while maintaining the DLC film on the wafer-contact surface. This localized treatment strategy addresses dusting issues precisely where they occur without compromising the functional integrity of the wafer-contact surface.
2Object-generated harmful factors
If heat treatment is performed to form an oxide surface film, then dusting is reduced, but mechanical strength decreases and friction coefficient increases
Solution Approach 1:
The oxidation treatment is applied locally only to side and back surfaces where dusting is a problem, rather than the entire wafer chuck. This localized application minimizes the impact on overall mechanical strength while still achieving dusting reduction on the specific surfaces where it occurs.
Solution Approach 2:
The invention creates a composite structure with the oxidation-treated layer on side and back surfaces and the DLC film on the wafer-contact surface. This composite approach allows the oxidation layer to provide dusting reduction on non-contact surfaces while the DLC film maintains low friction and high durability on the contact surface.
3Object-generated harmful factors
If a DLC film is formed on the wafer chuck surface, then adhesion is improved and dusting is reduced, but the side surface and back surface remain untreated
Solution Approach 1:
The solution segments the surface treatment strategy by applying oxidation treatment to side and back surfaces while maintaining DLC film on the wafer-contact surface. This segmentation allows comprehensive dusting reduction across all surfaces while preserving the functional advantages of DLC where needed.
Solution Approach 2:
The invention merges two different surface treatment approaches: oxidation treatment for dusting reduction on non-contact surfaces and DLC film formation for low-friction, high-durability performance on the contact surface. This combination creates a comprehensive solution that addresses both dusting and functional requirements.
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 effectively reduces dusting and improves durability by minimizing wear and maintaining positioning accuracy, ensuring high flatness and adhesion of the DLC film.
Implementation Method 1
oxidation-treating a surface of a base made of a ceramic containing silicon carbide
Implementation Method 2
Heat treatment of a silicon carbide ceramic at a temperature in the range of 400° C. to 1400° C. in the air or in an oxidizing atmosphere
Implementation Method 3
forming a film made of diamond-like carbon (DLC) on the outermost surface of the base
Data Source
AI summary
A wafer chuck includes a base made of a ceramic containing silicon carbide. The base has an oxidation-treated layer, and a film made of diamond-like carbon (DLC) is formed on an outermost surface of the base.