Continuous Substrate Coating with Segmented Cleaning Chamber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing continuous coating technologies face issues with parasitic deposits causing layer inhomogeneity, blockages, and reduced uptime due to friction and flaking, which are difficult to manage with current cleaning methods, especially for etch-resistant materials like silicon carbide.
Innovation Solution
The method involves fixing a cover to substrate carriers to prevent friction and improve sealing, allowing for ex-situ cleaning and using a sacrificial layer to simplify etching-back of parasitic deposits, which are transported out of the deposition chamber for removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular cleaning by in-situ etching-back is used, then parasitic layers are removed, but this method cannot be applied to etch-resistant layers like silicon carbide
Solution Approach 1:
The deposition chamber is segmented into a working chamber and a cleaning chamber separated by a transfer chamber. Substrate carriers are transported between chambers, allowing the working chamber to maintain deposition conditions while the cleaning chamber handles removal of parasitic layers, enabling specialized cleaning methods for etch-resistant materials.
Solution Approach 2:
A transfer chamber acts as an intermediary between the deposition chamber and cleaning chamber. This intermediate space allows substrate carriers to be moved without exposing the deposition chamber to cleaning processes, enabling the use of specialized cleaning methods for different layer types without affecting the main deposition process.
2Reliability
If regular ex-situ cleaning is used, then parasitic deposits are removed, but additional time expenditure is associated
Solution Approach 1:
The system enables continuous operation by maintaining substrate carriers in a ready state through pre-cleaning in the cleaning chamber before deposition. Multiple carriers can be prepared simultaneously, allowing continuous deposition without interruption for cleaning, thus eliminating downtime while maintaining effective parasitic deposit removal.
3Reliability
If regular exchanging of parasitically coated surfaces is used, then parasitic deposits are removed, but this represents an expensive variant
Solution Approach 1:
Instead of discarding entire substrate carriers after use, the system recovers and reuses them. The cleaning chamber restores carriers by removing parasitic deposits, allowing multiple deposition cycles on the same carrier without replacement, significantly reducing costs while maintaining reliable parasitic deposit elimination.
4Object-affected harmful factors
If cover material is used to protect surfaces from parasitic deposits, then protection is achieved, but the cover material needs frequent cleaning or exchanging
Solution Approach 1:
The cover material is extracted from the deposition chamber environment and placed in a dedicated cleaning chamber for restoration. This separation allows the cover to be cleaned or replaced without interrupting the deposition process, maintaining protection while minimizing maintenance time impact on production.
5Object-generated harmful factors
If directed gas flow is used to avoid contact of surfaces with process gas, then parasitic deposit formation is limited, but prevention is only partial
Solution Approach 1:
Instead of relying solely on gas flow direction during deposition, the system performs preliminary cleaning of substrate carriers and chamber surfaces before deposition begins. This preventive cleaning removes potential nucleation sites for parasitic deposits, enhancing the effectiveness of gas flow control and providing more reliable deposit prevention.
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 approach significantly reduces parasitic deposit formation, minimizes downtime, and ensures continuous operation by preventing particle entry and flaking, maintaining layer quality and extending plant uptime.
Implementation Method 1
The cover (6) is fixed to the substrate carriers (1, 1') and can therefore be transported together with the substrate carriers (1, 1') through the coating device... the friction between the components (and the disadvantage associated therewith of the formation of abraded particles) can be prevented
Implementation Method 2
the substrates on the substrate carriers being transported through the coating device, the continuous coating of the substrates being effected during the transport
Implementation Method 3
a sacrificial layer to simplify etching-back of parasitic deposits
Implementation Method 4
the continuous coating of the substrates being effected during the transport
Data Source
AI summary
The invention relates to a method for continuous coating of substrates, in which the substrates are transported continuously through a deposition chamber and, at the same time, measures are adopted for reducing parasitic deposits as well as possible. Likewise, the invention relates to a corresponding device for continuous coating of substrates.