Continuous Ingot Growth with Molten Silicon Flow and Impurity Blocking
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Solution Overview
Problem
Conventional Czochralski crystal growth methods face issues such as increased manufacturing costs due to the use of dual-type crucibles and splashing of molten silicon, which can lead to thermal deformation and reduced durability of the crucible.
Innovation Solution
A continuous ingot growing apparatus with a preliminary crucible that melts solid silicon material and supplies it to a main crucible, featuring a beak and partitions to control the supply of molten silicon, while blocking floating matter and adjusting the supply amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-type crucible is used to directly melt solid silicon material, then the melting function is achieved, but the manufacturing cost of the ingot molding apparatus increases
Solution Approach 1:
The crucible system is divided into two separate components: a preliminary crucible for melting solid silicon material and a main crucible for holding molten silicon. This segmentation allows each crucible to be optimized for its specific function, reducing the need for expensive dual-type crucibles while maintaining the melting function.
2Ease of operation
If solid silicon material is directly introduced into the crucible in a fixed amount, then the supply process is simple, but molten silicon splashes in the main crucible
Solution Approach 1:
The preliminary crucible acts as an intermediary device between the solid silicon material supply and the main crucible. It melts the solid material and controls the flow of molten silicon, preventing direct introduction and subsequent splashing while maintaining operational simplicity.
3Object-generated harmful factors
If the height at which liquid silicon material is introduced is lowered to prevent splashing, then splashing is reduced, but thermal deformation occurs making it difficult to use for a long time
Solution Approach 1:
By separating the melting function (preliminary crucible) from the holding function (main crucible), the system avoids the need to lower the introduction height, thereby preventing thermal deformation and extending crucible durability while still reducing splashing.
4Quantity of substance
If the opening in the preliminary crucible is made larger to increase supply amount, then more molten silicon is supplied, but floating matter is also supplied to the main crucible
Solution Approach 1:
The opening is positioned at a specific location and height within the preliminary crucible, creating a local quality difference. This positioning allows the opening to filter out floating matter while still supplying sufficient molten silicon to the main crucible, maintaining both supply amount and ingot quality.
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 apparatus reduces manufacturing costs, prevents splashing, extends crucible durability, and maintains temperature stability, resulting in higher ingot quality and yield.
Implementation Method 1
a preliminary crucible heating module that heats the preliminary crucible
Implementation Method 2
a beak which is provided on one side of the body so that the molten silicon melted in the body is supplied to the main crucible
Data Source
AI summary
The present invention relates to a continuous ingot growing apparatus, and more specifically, to a continuous ingot growing apparatus which melts a solid silicon material supplied to a preliminary crucible to supply the solid silicon material to a main crucible and which can adjust a supply amount of molten silicon while blocking floating matter floating on top of the molten silicon so as not to be supplied.