Layered temperature control polycrystalline ingot casting furnace

Abstract

The invention discloses a layered temperature control polycrystalline ingot casting furnace, which comprises a furnace body, a cooling table arranged on the bottom portion of the furnace body and used for placing a silicon material, and heaters arranged between the interior of the furnace body and the outer circumference of the cooling table, wherein the heaters comprise a plurality of side heaters arranged on the circumferential portion of the cooling table along the height direction of the furnace body, and a top heater arranged above the side heaters and the cooling table, and the plurality of the side heaters are respectively connected to different power supply modules so as to respectively and conveniently control the heating temperature of any one of the side heaters. According to the present invention, with the layered temperature control polycrystalline ingot casting furnace, the temperature gradient of the thermal field in the furnace body can be precisely adjusted, the production speed of the polycrystalline silicon ingot can be precisely controlled, the slow silicon ingot growth at the late stage and the dislocation proliferation of the middle-upper portion of the silicon ingot can be solved, and the crystal quality of the middle-upper silicon ingot and the battery conversion efficiency can be improved.

Description

technical field [0001] The invention relates to the field of solar photovoltaics, in particular to a layered temperature-controlled polycrystalline ingot furnace. Background technique [0002] In the process of polycrystalline ingot casting in the solar industry, a crucible filled with high-purity silicon material will be placed in a polycrystalline ingot casting furnace, and heated by a heater to melt all the silicon material into a silicon melt. Subsequently, by opening the hot spot or lifting the side insulation cage, the temperature of the condensation table is lowered and the temperature of the silicon melt in the crucible is indirectly lowered, thereby starting crystal nucleation and growth. [0003] At present, the heaters of polycrystalline ingot furnaces are usually distributed around the crucible, and are heated on five sides of the top and side of the crucible. There are also some furnace platforms that are equipped with a separate set of graphite heaters under th...

AI Technical Summary

Problems solved by technology

In the current ingot casting furnace, most of the side heaters are mostly single-layer structure, it is difficult to use the side heater to adjust the temperature gradient of the thermal field, which is not conducive to the growth rate control of the crystal growth process in the ingot casting process, and directly affects the ingot casting Efficiency and ingot quality

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