Process Box Partition Wall Diffusion Barrier for RTP
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Solution Overview
Problem
The complex and costly construction of vacuum-tight process chambers in thin-film solar module production leads to increased wear and maintenance needs, particularly during high-temperature RTP heat treatment, which can result in leaks and production interruptions.
Innovation Solution
A process box with a gas-tight, evacuable cavity that uses electromagnetic heating and a partition wall as a diffusion barrier to maintain a controlled atmosphere, allowing for simpler and more cost-effective processing of coated substrates, reducing the need for complex vacuum-compatible components and minimizing volatile component loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum-tight process chambers are used for RTP heat treatment, then the process atmosphere can be controlled, but the device complexity and cost increase significantly
Solution Approach 1:
The process chamber is divided into a process space for substrate treatment and an intermediate space separated by a partition wall. This segmentation allows the process space to be evacuated while the intermediate space remains at atmospheric pressure, reducing the complexity of vacuum sealing requirements.
Solution Approach 2:
A partition wall with openings acts as an intermediary barrier between the evacuated process space and the atmospheric intermediate space. This partition wall controls the diffusion of volatile chalcogen components while allowing gas exchange, eliminating the need for complete vacuum sealing.
2Reliability
If vacuum-tight process chambers are used, then process control is improved, but wear and maintenance needs increase during high-temperature treatment
Solution Approach 1:
By segmenting the chamber into process and intermediate spaces, the vacuum requirements are localized only to the process space. This reduces the surface area and number of vacuum seals required, thereby reducing wear and maintenance needs during high-temperature operation.
Solution Approach 2:
The partition wall with openings provides a simpler, more durable barrier that does not require complex vacuum sealing mechanisms. This simpler structure is more resistant to wear from thermal cycling and corrosive gases, reducing maintenance frequency.
3Reliability
If complete vacuum sealing is used, then gas leakage is prevented, but volatile chalcogen component loss increases
Solution Approach 1:
The partition wall acts as an intermediary that selectively controls gas exchange between the process and intermediate spaces. It allows controlled diffusion of volatile chalcogen components while preventing uncontrolled leakage, maintaining a balance between containment and substance retention.
Solution Approach 2:
The partition wall with openings functions as a porous barrier that enables controlled diffusion of gases. This porous structure allows volatile chalcogen components to diffuse through controlled openings rather than being completely trapped, preventing pressure buildup while minimizing uncontrolled loss.
4Reliability
If complex vacuum-compatible components are used, then vacuum tightness is achieved, but production interruptions due to failures increase
Solution Approach 1:
Segmenting the vacuum requirement to only the process space reduces the number and complexity of vacuum-compatible components needed. Fewer complex components mean fewer potential failure points, reducing production interruptions.
Solution Approach 2:
The partition wall with openings serves as a simple intermediary structure that does not require complex vacuum sealing mechanisms. This simpler design is more reliable and less prone to failure, maintaining production continuity.
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 simplifies the processing system, reduces maintenance costs, and maintains the partial pressure of volatile chalcogen components, enhancing the quality of compound semiconductors produced while minimizing substrate exposure to corrosive gases and environmental influences.
Implementation Method 1
the partition wall between the coated substrate and the temperature-controllable or coolable housing section is arranged. The partition serves as a diffusion barrier (vapor barrier) for gas exchange between the process and intermediate space during the heat treatment
Implementation Method 2
each of which is designed to enable heat treatment by means of electromagnetic heating radiation impinging on the housing section
Implementation Method 3
The temperature-controllable or coolable housing sections can be actively cooled in relation to the temperature of the substrate during the heat treatment
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
The invention relates to a process box for processing a coated substrate, having the following features: a housing, which can be closed gas-tight and which forms a cavity; the housing comprises at least one housing section that is designed in such a way that the substrate can be heat-treated by means of electromagnetic heating radiation incident on the housing section; the housing has at least one housing section that can be coupled to a cooling device for cooling said housing section and at least one housing section that cannot be cooled; the cavity is divided by at least one separating wall into a process chamber for accommodating the substrate and an intermediate chamber, wherein the separating wall has one or more openings and is arranged between the substrate and the temperature-controllable housing section; the housing is provided with at least one gas feed-through for evacuating the cavity and introducing process gas into the cavity, which gas feed-through opens into the cavity and can be closed. The invention further relates to assemblies and a method for processing a coated substrate, in which method at least one housing section of the process box is cooled during and/or after the heat treatment and diffusion of a gaseous substance produced during the heat treatment to the temperature-controlled housing section is inhibited by a separating wall, which is provided with one or more openings and which is arranged between the coated substrate and the temperature-controlled housing section.