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Reutilization method and grating line recovery method of defective monocrystalline silicon battery sheet after sintering

A technology for monocrystalline silicon cells and silicon wafers, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of unsuitable monocrystalline silicon cells, achieve the convenience of overall recycling, improve the qualified rate of finished products, and reduce enterprise costs Effect

Active Publication Date: 2014-02-26
YINGLI GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for reusing unqualified monocrystalline silicon cells after sintering and a method for recycling grid lines, so as to solve the problem that the existing recycling process is not suitable for single crystal silicon cells after sintering

Method used

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  • Reutilization method and grating line recovery method of defective monocrystalline silicon battery sheet after sintering

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Embodiment 1

[0037] Embodiment 1: A method for reusing unqualified finished photovoltaic monocrystalline silicon cells of 156*156, the method specifically includes the following steps:

[0038] 1) Pickling step: Put 156*156 unqualified finished photovoltaic monocrystalline silicon cells into 10% HF solution, soak for 10 minutes at 25°C, take out pure water, clean them, dry them, and remove the fallen precious metals. Grid line for recovery and weighing.

[0039] 2) The step of removing the surface doping layer: at 16°C, use 40 parts by volume of HF with a mass concentration of 40%, 140 parts by volume of HNO3 with a mass concentration of 65%, and 70 parts by volume of water for 2 minutes. The corrosion thickness of the silicon wafer surface was controlled at 1.5 μm, and then rinsed with pure water; then the residual acid solution was removed with KOH with a mass concentration of 48%, and rinsed with pure water; Rinse with water and let dry.

[0040] 3) Perform secondary processing on the...

Embodiment 2

[0041] Embodiment 2: A method for reusing unqualified finished photovoltaic monocrystalline silicon cells of 125*125, the method specifically includes the following steps:

[0042] 1) Pickling step: Put 125*125 unqualified finished photovoltaic monocrystalline silicon cells into 15% HF solution, soak for 15 minutes at 30°C, take out pure water, clean them, and dry them to remove the fallen precious metals. Grid line for recovery and weighing.

[0043] 2) The step of removing the surface doping layer: at 14°C, use 30 parts by volume of HF with a mass concentration of 30%, and 130 parts by volume of HNO with a mass concentration of 60% 3 , 60 parts by volume of water mixed acid treatment for 5 minutes, the thickness of the corrosion amount on the surface of the silicon wafer is controlled at 1.0 μm, and then rinsed with pure water; then use KOH with a mass concentration of 40% to remove the residual acid solution and rinse with pure water; Then use HF with a mass concentration ...

Embodiment 3

[0045] Embodiment 3: a kind of 125*125 reutilization method of unqualified finished photovoltaic monocrystalline silicon cells, the method specifically comprises the following steps:

[0046] 1) Pickling step: put 125*125 unqualified finished photovoltaic monocrystalline silicon cells into 40% HF solution, soak for 3 minutes at 20°C, take out pure water, clean them, dry them, and remove the fallen precious metals Grid line for recovery and weighing.

[0047] 2) The step of removing the surface doping layer: at 18°C, use 50 parts by volume of HF with a mass concentration of 50%, 150 parts by volume of HNO3 with a mass concentration of 70%, and 80 parts by volume of water for 0.5 minutes, The thickness of the corrosion amount on the surface of the silicon wafer is controlled at 2.0 μm, and then rinsed with pure water; then the residual acid solution is removed with KOH with a mass concentration of 50%, and rinsed with pure water; then the red water is cleaned with HF with a mass...

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Abstract

The invention discloses a reutilization method and grating line recovery method of a defective monocrystalline silicon battery sheet after sintering. The reutilization method comprises the following steps: performing acid treatment on the defective monocrystalline silicon battery sheet to obtain a silicon chip to be used; and returning the silicon chip to be used to a monocrystalline silicon production process for secondary processing so as to obtain a qualified finished product monocrystalline silicon battery sheet. By using the method provided by the invention, a waste can be changed into valuable things in that the defective monocrystalline silicon battery sheet can be reprocessed and manufactured to be the qualified monocrystalline silicon battery sheet, precious metals can be recovered conveniently, and the production cost is substantially saved.

Description

technical field [0001] The invention relates to the field of solar cell manufacturing, in particular to a recycling method for sintered unqualified monocrystalline silicon cells and a method for recycling precious metals of grid lines. Background technique [0002] In the production of photovoltaic monocrystalline cells, various unqualified monocrystalline silicon cells will be caused due to occasional shaking of equipment or problems in other process steps. These unqualified monocrystalline silicon cells can account for 3% of the company's daily production. The ratio affects the qualified rate of finished products to a certain extent. [0003] The production process steps of photovoltaic monocrystalline cells are as follows: starting from the selection of qualified original silicon wafers, making a layer of suede on the surface of the silicon wafers through alkali corrosion, which can reduce light reflection, and then performing phosphorus diffusion to form a phosphorus dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCH01L31/1804
Inventor 商瑜颜广杨浩杨国涛唐宝田程立威
Owner YINGLI GRP
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