Directional Silicon Solidification via Bottom Cooling Fins
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for purifying silicon to solar grade from metallurgical grade are costly and inefficient, as they rely on expensive cooling and heating mechanisms that fail to effectively control the directional solidification process, leading to impurities in the final product.
Innovation Solution
A directional solidification apparatus and method using a crucible with a bottom that includes heat transfer fins and a cooling platform with forced air to dissipate heat, combined with a top heater for precise temperature control, allowing for efficient purification of silicon by controlling the temperature gradient and crystallization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cooling and heating mechanisms are used for directional solidification, then temperature control is achieved, but the cost and complexity of the apparatus increases significantly
Solution Approach 1:
The patent extracts the cooling function from complex internal cooling conduits and implements it through a simple cooling plate with heat transfer fins at the bottom of the crucible. This externalized cooling approach maintains temperature gradient control while eliminating complicated cooling mechanisms, directly resolving the contradiction between purification quality and device complexity
Solution Approach 2:
The invention replaces expensive, maintenance-intensive cooling conduits with a simple, inexpensive cooling plate that can be easily replaced. The cooling plate with fins provides effective cooling without the high cost and complexity of conventional systems, addressing both the quality and complexity concerns
2Reliability
If conventional cooling mechanisms with conduits are used, then cooling capability is provided, but maintenance difficulty and cost increase
Solution Approach 1:
The cooling function is extracted from complex internal conduits and implemented through a simple external cooling plate. This design eliminates the maintenance issues associated with internal cooling systems while maintaining reliable temperature control, directly addressing the contradiction between reliability and ease of repair
Solution Approach 2:
The cooling plate with heat transfer fins provides self-contained cooling capability without requiring complex maintenance systems. The design allows for easy replacement and maintenance while maintaining reliable operation, resolving the contradiction between reliability and maintenance difficulty
3Manufacturing precision
If highly insulated ingot sides are used during solidification, then directional solidification is improved, but the dimensions of the ingot and production cost are negatively affected
Solution Approach 1:
The patent applies insulation selectively - the crucible sides are insulated to maintain directional solidification, while the bottom incorporates heat transfer fins for efficient cooling. This localized approach to insulation maintains purification quality while improving heat transfer efficiency and reducing production costs, resolving the contradiction between manufacturing precision and productivity
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 results in a more cost-effective and efficient method for purifying silicon, producing a more pure and consistent product by controlling the directional solidification process, suitable for use in solar cells.
Implementation Method 1
a cooling duct configured to provide a portion of forced air to the portion of the bottom of the directional solidification crucible
Implementation Method 2
a bottom that includes heat transfer fins and a cooling platform with forced air to dissipate heat
Implementation Method 3
combined with a top heater for precise temperature control
Implementation Method 4
directional solidification apparatus and method... allowing for efficient purification of silicon by controlling the temperature gradient and crystallization process
Data Source
AI summary
The present invention relates to an apparatus and method for directional solidification of silicon. The apparatus can use a cooling platform to cool a portion of a bottom of a directional solidification crucible. The apparatus and method of the present invention can be used to make silicon crystals for use in solar cells.