Making method of seed crystal for polycrystalline ingot

A technology for polycrystalline ingots and production methods, which is applied in the growth of polycrystalline materials, chemical instruments and methods, crystal growth, etc., can solve the problems of high cost of seed crystals, non-reuse, and high purchase price.

Inactive Publication Date: 2016-11-09
JINKO SOLAR CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Seed crystals, as the foundation of semi-molten high-efficiency nucleation, are the most important part in the ingot casting process. Without high-quality seed crystals, high-efficiency semi-molten silicon ingots cannot be formed. However, since the existing seed crystals are all p

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  • Making method of seed crystal for polycrystalline ingot
  • Making method of seed crystal for polycrystalline ingot

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Embodiment Construction

[0032] The core idea of ​​the present invention is to provide a method for making seed crystals for polycrystalline ingots, which can reuse the unmelted layer at the bottom, obtain stable and efficient seed crystals, improve the crystal quality of polycrystalline ingots, and reduce production costs .

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] The method for making the first seed crystal for polycrystalline ingot provided in the embodiment of the present application is as follows: figure 1 as ...

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Abstract

The invention discloses a making method of a seed crystal for a polycrystalline ingot. The making method comprises the steps that a made silicon block is provided; a seed crystal unmelted layer located at the tail portion of the silicon block is cut off; the seed crystal unmelted layer is roasted, and remained colloid located at the bottom of the seed crystal unmelted layer is removed; pickling and soaking are conducted on the seed crystal unmelted layer for first preset time; the seed crystal unmelted layer is crushed into seed crystal particles; the seed crystal particles are soaked with a strong acid mixed liquor for second preset time; the seed crystal particles are subjected to washing, ultrasonic cleaning and drying, and the seed crystal for the polycrystalline ingot is obtained. According to the making method of the seed crystal for the polycrystalline ingot, the bottom unmelted layer can be recycled, the efficient seed crystal which is stable in performance is obtained, the crystal quality of the polycrystalline ingot is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic equipment manufacturing, and in particular relates to a method for making a seed crystal for polycrystalline ingot. Background technique [0002] At present, crystalline silicon solar cells occupy a dominant position in 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] When using an ingot furnace to grow cast polycrystalline crystals using a semi-melting process, it is necessary to place fine particles at the bottom of the quartz crucible as a seed crystal to form a nucleation seed. Seed crystals, as the foundation of semi-molten high-efficiency nucleation, are the most important part in the ingot casting process. Without high-quality seed crystals, ...

Claims

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Application Information

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IPC IPC(8): C30B28/06C30B29/06
CPCC30B28/06C30B29/06
Inventor 陈养俊陈志军曾先平陈伟肖贵云李林东金浩
Owner JINKO SOLAR CO LTD
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