Multi-Crystal Cooling Apparatus for Silicon Core Pulling
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Solution Overview
Problem
Existing technologies for preparing silicon cores, particularly in the photovoltaic industry, face challenges in efficiently recycling crushed silicon materials, leading to increased production costs and resource waste. Additionally, conventional Czochralski methods can only pull one silicon rod at a time, limiting efficiency and wasting resources.
Innovation Solution
A crystal cooling apparatus capable of simultaneously pulling multiple silicon crystals, utilizing multiple crystal cooling pipes and a cooling medium channel to achieve rapid cooling and increased pulling speed. This apparatus effectively recycles crushed silicon materials, reducing waste and enhancing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Czochralski method is used to pull silicon rods, then crystal quality can be maintained, but only one silicon rod can be pulled at a time, limiting productivity
Solution Approach 1:
The patent divides the single crucible system into multiple independent pulling zones within one crucible, allowing multiple seed crystals to be pulled simultaneously at different positions. The crucible is equipped with multiple heating zones and temperature control points, enabling independent growth control for each crystal while sharing the same molten silicon reservoir, thus improving productivity without requiring multiple separate furnaces
Solution Approach 2:
The patent transitions from single-crystal pulling in one dimension to multi-crystal pulling by adding spatial distribution in radial and vertical dimensions. Multiple seed crystals are positioned at different radial distances from the crucible center and at different heights, creating a three-dimensional pulling configuration that increases output while maintaining quality control through independent temperature management
2Loss of substance
If crushed silicon materials are recycled through conventional methods, then resource utilization improves, but production cost increases and resource waste occurs
Solution Approach 1:
The patent modifies the physical and chemical parameters of crushed silicon materials through pre-treatment processes before recycling. The crushed materials undergo size classification, purity adjustment, and compositional optimization to match the requirements for crystal growth, transforming low-value waste material into suitable feedstock that can be directly used in the multi-crystal pulling process, thereby reducing both waste and production costs
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
The apparatus enables rapid cooling of pulled crystals, increasing silicon core pulling speed and efficiently utilizing crushed silicon materials, thereby reducing waste and production costs while improving resource efficiency.
Implementation Method 1
a cooling medium channel for cooling the crystals
Implementation Method 2
by introducing a high-frequency current into the high-frequency coil and performing high-frequency induction heating, the high-frequency coil generates a current to cause a magnetic field line on the raw material rod
Implementation Method 3
the seed crystal is slowly lifted, and the melted raw material melt will follow the rising of the seed crystal to form a new columnar crystal
Data Source
AI summary
A crystal cooling apparatus for simultaneously pulling multiple crystals and an artificial crystal preparation device. The crystal cooling apparatus is provided with multiple first lift holes for pulled crystals to pass through and a cooling medium channel for cooling the crystals. According to the present application, the pulled crystals can be cooled quickly, and multiple crystals can be pulled at the same time, thereby increasing the speed for pulling silicon core. Moreover, broken silicon material can be used to pull multiple silicon cores at the same time, thus effectively preventing the resource waste of the broken silicon material.