Ceramic Faraday Faceplate for High-Temperature Plasma Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor processing systems face issues with parasitic plasma generation outside the intended processing region, leading to substrate contamination, temperature non-uniformity, and component failure, particularly at high temperatures due to the use of aluminum faceplates that deform and generate parasitic plasma.
Innovation Solution
The use of ceramic faceplates integrated with Faraday cages and grounded peripheral edges to reduce electric fields, minimizing parasitic plasma generation and maintaining uniformity at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aluminum faceplates are used for high-temperature processing, then thermal conductivity is improved, but parasitic plasma generation increases and component deformation occurs
Solution Approach 1:
A Faraday cage constructed from RF mesh is introduced as an intermediary component between the heater and the faceplate. This mesh structure acts as a mediator that blocks parasitic plasma generation while allowing thermal energy to pass through, thereby resolving the contradiction between high-temperature processing capability and parasitic plasma control
Solution Approach 2:
The faceplate system transitions from a single aluminum material to a composite structure combining aluminum faceplate with a Faraday cage mesh and ceramic insulators. This composite approach allows the system to maintain thermal conductivity while adding plasma-shielding functionality, thus resolving the contradiction between thermal performance and parasitic plasma prevention
2Ease of manufacture
If aluminum faceplates are used, then ease of manufacture is improved, but structural stability at high temperature deteriorates due to deformation
Solution Approach 1:
The system combines aluminum faceplate (easy to manufacture) with ceramic insulating materials and RF mesh to create a composite structure. The ceramic components provide high-temperature structural stability while the aluminum maintains manufacturing simplicity, resolving the contradiction between ease of manufacture and thermal stability
3Device complexity
If conventional faceplate design is used, then device complexity is minimized, but substrate contamination and component failure increase
Solution Approach 1:
The Faraday cage mesh acts as an intermediary component that prevents parasitic plasma from reaching the substrate and other components. This additional layer protects against contamination and failure while maintaining relatively simple integration, resolving the contradiction between device complexity and processing reliability
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
Ceramic faceplates with Faraday cages enable high-temperature processing while reducing parasitic plasma, improving substrate processing efficiency and reducing contamination and component failure.
Implementation Method 1
The first RF mesh and the second RF mesh may be coupled together and form a Faraday cage about the heater
Implementation Method 2
The body may be made of a ceramic material. An insulating sleeve may circumferentially surround the portion of the first strut. The insulating sleeve may include a ceramic material.
Implementation Method 3
The faceplates may include a heater disposed within an interior of the body
Data Source
AI summary
Exemplary semiconductor processing chamber faceplates may include a body having a first surface and a second surface opposite the first surface. The body may define a plurality of apertures that extend through one or both of the first surface and the second surface. The faceplates may include a heater disposed within an interior of the body. The faceplates may include a first RF mesh disposed between the heater and the first surface. The faceplates may include a second RF mesh disposed between the heater and the second surface. The first RF mesh and the second RF mesh may be coupled together and form a Faraday cage about the heater.