Continuous Coating CSS Reactor with Lock Chamber Refill
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Solution Overview
Problem
The CSS reactor must be opened to top up semiconductor material, disrupting the production process, leading to reduced sublimation rate, nonuniform coating, and potential contamination of toxic substances, which increases setup time and quality fluctuations.
Innovation Solution
The method involves continuous evaporation and deposition of semiconductor material in a closed reactor, where the crucible is preheated and topped up with material in a lock chamber, maintaining constant temperature and pressure to minimize sublimation rate fluctuations and prevent atmospheric interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the reactor is opened to top up semiconductor material in the crucible, then the material supply is replenished, but the production process is interrupted and quality fluctuations occur
Solution Approach 1:
The reactor system is segmented into a main reaction chamber and a separate locking chamber. The locking chamber can be independently opened and closed, allowing material replenishment without exposing the main reaction chamber to atmospheric contamination. This spatial segmentation enables continuous production while maintaining coating quality.
Solution Approach 2:
The locking chamber is pre-filled with semiconductor material before the main reaction begins. This preliminary preparation allows the crucible to be topped up without interrupting the ongoing deposition process in the main chamber, thereby maintaining coating uniformity and preventing production interruptions.
2Quantity of substance
If the reactor is opened for crucible replenishment, then material can be added, but toxic substances may contaminate the atmosphere
Solution Approach 1:
The system is divided into a sealed main reaction chamber and an isolated locking chamber. Material replenishment operations are confined to the locking chamber, which can be opened independently. This segmentation prevents toxic semiconductor materials from escaping into the laboratory atmosphere while still allowing crucible replenishment.
Solution Approach 2:
The locking chamber acts as an intermediary between the external environment and the main reaction chamber. It serves as a buffer zone where material handling can occur without directly exposing the sensitive main chamber to atmospheric contamination, thereby preventing toxic substance release.
3Object-affected harmful factors
If the reactor is cooled before opening for replenishment, then safety is improved, but setup time increases
Solution Approach 1:
The reactor system is segmented into a main chamber that maintains continuous production temperature and a separate locking chamber for material replenishment. This allows the main chamber to remain hot and productive while the locking chamber handles material loading, eliminating the need to cool down the entire system for safety.
Solution Approach 2:
Material replenishment is performed in advance in the locking chamber while the main reaction chamber maintains its operating temperature. This preliminary action in the isolated chamber allows safe material handling without requiring the main chamber to be cooled, thereby minimizing setup time and maintaining continuous production.
4Manufacturing precision
If the reactor is evacuated for sublimation, then deposition quality is improved, but evacuation time extends setup duration
Solution Approach 1:
The vacuum system is segmented such that the main reaction chamber maintains continuous vacuum for high-quality deposition, while the locking chamber can be independently evacuated or vented. This allows material replenishment in the locking chamber without requiring evacuation of the entire system, reducing setup time while maintaining deposition quality in the main chamber.
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 allows for continuous semiconductor material coating with reduced quality fluctuations and minimized contamination, maintaining consistent sublimation and deposition rates, thus ensuring uniform layer growth on the substrate.
Implementation Method 1
a semiconductor material is evaporated in a crucible and guided to the surface of a substrate to be coated where it is deposited
Implementation Method 2
The selenium initially liquefies in the graphite crucible before then evaporating
Implementation Method 3
a chalcogen vapour—carrier gas mixture is introduced into the process chamber so that the chalcogen vapour condenses on the substrate
Data Source
AI summary
The invention relates to a method for the continuous coating of at least one substrate 14 with a semiconductor material e.g. CdTe. To this end a semiconductor material is sublimated in at least one crucible 30 in order to deposit it on a substrate, e.g. a glass panel. If the crucible 30 is filled with semiconductor material (16) during the deposition and/or evaporation, the set-up time required otherwise is then eliminated. Preferably used for carrying out the method is a CSS reactor comprising a crucible, a guide for substrates and at least one lock through which the crucible can be refilled during evaporation of semiconductor material from the crucible.