Removable Reactor Floor for CVD SiC Systems
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Solution Overview
Problem
Conventional chemical vapor deposition (CVD) SiC reactors face challenges with parasitic deposition on reactor surfaces, leading to particle generation, process drift, and reduced reactor availability due to frequent preventative maintenance.
Innovation Solution
The introduction of a chemical vapor deposition system with a removable reactor floor, enabled by an automated handling system, allows for easy cleaning and optimized preventative maintenance, reducing downtime and extending the maintenance interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fixed reactor floor is used in CVD system, then the reactor structure is simple and reliable, but the maintenance interval is short and reactor availability is reduced due to frequent cleaning requirements
Solution Approach 1:
The reactor floor is segmented into a removable cover plate that can be separated from the main reactor body. This segmentation allows the cover plate to be independently removed for cleaning without shutting down the entire reactor system, thereby extending maintenance intervals and improving reactor availability while minimizing downtime.
2Ease of repair
If the reactor floor is made removable for easy maintenance, then the ease of repair is improved, but the device complexity increases due to additional components and automated handling systems
Solution Approach 1:
The cover plate is extracted as a separate removable component from the fixed reactor structure. This extraction enables easy removal and cleaning of the cover plate through automated handling systems, significantly improving ease of repair while the modular design keeps the added complexity manageable.
3Manufacturing precision
If frequent preventative maintenance is performed on the reactor floor, then the manufacturing precision is maintained by preventing particle generation, but the productivity is reduced due to frequent shutdowns
Solution Approach 1:
By segmenting the reactor floor into a removable cover plate, the system enables quick maintenance operations that prevent particle generation and maintain epitaxial layer quality without requiring frequent full reactor shutdowns, thus preserving productivity while ensuring manufacturing precision.
Solution Approach 2:
The removable cover plate design allows for preliminary cleaning actions to be performed quickly and efficiently on the critical surface that contacts the epitaxial layers, preventing particle generation before it affects product quality, thereby maintaining manufacturing precision without significant productivity loss.
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 significantly reduces costly downtime, extends the preventative maintenance interval, and improves reactor availability, leading to enhanced yield and productivity in semiconductor fabrication.
Implementation Method 1
chemical vapor deposition (CVD) SiC reactors
Implementation Method 2
The heated sidewalls are maintained at a temperature sufficient to crack the process gases for silicon (e.g., silane and chlorosilane) and carbon sources (alkanes) to generate the intermediate reactive species for growth of SiC on the wafer
Implementation Method 3
The water-cooled ceiling is maintained at a temperature to control the deposition of materials on the wafer
Data Source
AI summary
A chemical vapor deposition system includes a reaction chamber and a removable wafer carrier including a wafer carrier body that is configured to support a wafer. The system includes a removable cover plate that supports the wafer carrier body and a susceptor base is disposed below the cover plate that supports the cover plate. The removable cover plate is in a nested arrangement with respect to the susceptor base as a result of first nesting structure of the removable cover plate mating with a second nesting structure of the susceptor base.