Cooling block for polycrystalline silicon ingot furnace

Abstract

The invention relates to a cooling block for a polycrystalline silicon ingot furnace, and belongs to the fields of novel energy and photovoltaics. The cooling block comprises a cooling block body and a crucible, the crucible is disposed at the top surface of the cooling block body; the top surface of the cooling block body is provided with a groove; the crucible covers on the groove; and the central line of the groove, the central line of the crucible and the central line of the cooling block overlap with one another. Proper heat preservation for corner parts of the crucible by arranging a square groove and utilizing difference between thermal conductivities of the air and graphite, so that preferential growth of crystal grains near the wall of the crucible is inhibited; relatively flat solid-liquid interface can be obtained; and the quality of directionally solidified polycrystalline silicon can be increased.

Description

technical field [0001] The invention relates to a cooling block, in particular to a polycrystalline silicon ingot furnace cooling block, which is mainly used in the thermal field system of polycrystalline silicon directional solidification casting equipment in the field of photovoltaic solar energy, and belongs to the fields of new energy and photovoltaics. Background technique [0002] In recent years, with the depletion of fossil and non-renewable resources such as petroleum and coal in the world, solar energy has gradually become one of the most important renewable new energy sources in the future. Polycrystalline silicon solar cells are one of the most important photovoltaic products. The preparation of this product requires The solar grade silicon material is cast into silicon ingots, and then squared, sliced ​​and other steps are made to make silicon wafers for solar cells, and then the subsequent production of solar cells, modules, and power stations is carried out. ...

AI Technical Summary

Problems solved by technology

The invention patent includes a furnace body and a bracket. There is a crucible in the furnace body, a graphite crucible on the outside of the crucible, and a graphite cooling block below the graphite crucible. Although this patent increases the effect of purification and crystal growth, it improves the reliability of the polysilicon ingot casting device. , but the heat dissipation at the bottom of the crucible is faster, the grain production speed near the crucible is faster, and the growth direction of the grain is shifted, so it still has the above defects

[0006] Chinese Patent No. 200820031102.X discloses a utility model patent titled "Polysilicon Ingot Furnace Thermal Field Structure with Graphite Cooling Block Insulation Bar", which includes a thermal insulation cage, and the thermal insulation cage is installed on the side With the heater on the top surface and the graphite cooling block where the crucible is placed, insulation strips are installed around the bottom of the graphite cooling block. This patent reduces the content of microcrystals in the effective area, but cannot inhibit the preferential crystallization near the crucible wall, and the photoelectric conversion efficiency is low. , so it still has the above defects

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