Abstract
In this paper, we present a solidification growth model that primarily describes the principal components of horizontal ribbon growth process, but also discusses the interaction between fluid flow and heat transfer, crystallization dynamics, and the effects of oxygen impurity distribution in melts, particularly with respect to the morphology of the interface. The effects of the jet cooling rate, pulling speed, and transfer coefficient on solute transport were studied. The results showed that a higher jet velocity produces a sharper temperature gradient at the interface and a stronger Marangoni effect, facilitates solute transport in the silicon melt, and promotes higher oxygen concentration in crystal. The stronger Marangoni convection causes more rapid oxygen transfer in the silicon melt and a higher oxygen concentration. Solidification front increases the downward flow velocity of the eddy current as the pulling speed is increased; this leads to a decrease in solute concentration at the interface. An increase in the downward flow of the vortex confluence facilitates the reduction of solute concentration in the crystal. An increase in the upward flow of the vortex confluence will increase the concentration in the crystal. The oxygen concentration is concentrated at the top and bottom of the silicon ribbon.
Highlights
With the continued deterioration of the global environment and the increasing scarcity of resources, renewable energy has been replacing fossil fuels and other conventionally used types of energy
The stronger Marangoni convection causes an increase in the rate of oxygen transfer in the silicon melt and a higher concentration of oxygen
As the pulling speed is increased, the downward flow velocity of the eddy current is progressively increased by the solidification front, thereby decreasing the solute concentration at the interface
Summary
With the continued deterioration of the global environment and the increasing scarcity of resources, renewable energy has been replacing fossil fuels and other conventionally used types of energy. Production of silicon ribbon via silicon ingot cutting results in a loss of up to 50% of the silicon material.[1] if the material loss can be reduced in the fabrication process of silicon ribbon, the cost of silicon ribbon will be significantly reduced. Increasing silicon ribbon production efficiency is an effective means of reducing the cost of photovoltaic power generation
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