Combined-type protection plate for ingot casting crucible
A composite, ingot-casting technology, applied in the directions of polycrystalline material growth, crystal growth, single crystal growth, etc., can solve the problems of poor heat insulation effect and low ingot yield rate, and can inhibit the formation of corner polycrystalline , the effect of improving the heat transfer coefficient and suppressing the generation of transverse heat flow
Inactive Publication Date: 2015-06-10
TIANWEI NEW ENERGY HLDG
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Problems solved by technology
[0005] In order to overcome the problem that the traditional crucible guard plate has a large side temperature gradient inside the crucible due to poor heat insulation effect, resulting in low ingot yield, the present invention provides a composite guard plate for ingot casting crucible
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[0025] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0026] figure 1 It is a schematic diagram of a traditional crucible guard plate, the bottom plate and side plate of the traditional crucible guard plate are both made of graphite as the guard plate. figure 2 It is a schematic diagram of the crucible guard plate of the present invention, and both the bottom plate 3 and the side plate 4 of the crucible guard plate of the present invention adopt a composite structure. image 3 A schematic diagram of heat conduction using a traditional crucible shield, Figure 4 It is a schematic diagram of heat conduction using the crucible guard plate of the present invention.
[0027] The preparation process of cast single crystal is as follows: first prepare the seed crystal and crucible, put the seed crystal on the bottom of the crucible, then put polysilicon and master alloy on top of the seed ...
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The invention relates to a combined-type protection plate for an ingot casting crucible. The combined-type protection plate comprises a side plate and a bottom plate. The side plate is divided into an upper half part and a lower half part, wherein the upper half part is made of graphite and the lower half part is made of a heat insulation material. The bottom plate can be divided into a ring edge part and a middle part, wherein the ring edge part is made of graphite and the middle part is made of a material with good heat conducting performance. By using the combined-type protection plate for the ingot casting crucible, the lateral heat transfer coefficient of the crucible can be effectively reduced, the heat transfer coefficient of the vertical direction of the crucible is improved, the generation of corner polycrystals is inhibited and the yield rate of cast ingots is improved.
Description
technical field [0001] The invention relates to a composite protective plate for an ingot crucible. Background technique [0002] Crystalline silicon solar cells currently dominate the photovoltaic industry. The cost of silicon wafers accounts for more than half of the cost of single / polycrystalline silicon, so reducing the cost of silicon wafers and improving the quality of silicon wafers are of great significance to the development of the photovoltaic industry. [0003] In conventional polysilicon, the random orientation of the grains makes it difficult to texture the resulting wafer surface. Texturing is used to increase cell efficiency by reducing light reflection and increasing the absorption of light energy passing through the cell surface. In addition, "kinks" that form on the boundaries (grain boundaries) between polysilicon grains tend to become nuclei for structural defects in the form of clusters or dislocation lines, and these dislocations and their gettering e...
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IPC IPC(8): C30B11/00C30B28/06C30B29/06
Inventor 罗大伟林洪峰张凤鸣王临水路忠林
Owner TIANWEI NEW ENERGY HLDG