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A kind of texturing method of polycrystalline silicon solar cell

A technology of solar cells and polysilicon, applied in the field of solar cells, can solve problems such as inaccessibility, and achieve the effects of easy access to equipment, deepening depth, and increasing incident angle

Active Publication Date: 2017-05-31
GUANGDONG AIKO SOLAR ENERGY TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polysilicon is composed of many small single crystal particles, which are isotropic, and the same effect as single crystal cannot be achieved by alkaline etching.

Method used

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  • A kind of texturing method of polycrystalline silicon solar cell
  • A kind of texturing method of polycrystalline silicon solar cell

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] In the prior art, the surface of the polycrystalline silicon chip is textured by acid method to increase the absorption area of ​​sunlight and reduce the reflectivity of the silicon chip. However, as the technology in this field becomes more and more mature, higher requirements are placed on the reflectivity of the polysilicon wafer.

[0027] The present inventor finds that the reaction speed of the silicon dioxide layer formed after the oxidation of the silicon wafer and the acid solution used for texturing by the acid method is slower than that of the silicon wafer and the acid solution, and there is a difference in reaction speed. Thus, the silicon dioxide The layer can effectively delay the corrosion rate of the acid solution. According to this charact...

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Abstract

The invention discloses a texturization method for a polycrystalline silicon solar battery. The method comprises the following steps that 1, the front side of a silicon wafer is oxidized, and a silicon dioxide layer with the thickness being 0.5 to 5nm is formed; 2, corrosive slurry is printed on the silicon dioxide layer, so that the corrosive slurry is dotted uniform distribution, after the silicon dioxide layer is placed for 1 to 5 minutes, cleaning and blowing drying are carried out, and the silicon dioxide layer in a corrosive slurry printing region is removed; 3, acid process texturization is carried out on the silicon wafer, so that a suede-like structure is formed on the surface of the silicon wafer, and the reflectivity of the suede-like structure is 5 percent to 10 percent. When the texturization method is adopted, the reflectivity of the polycrystalline silicon solar battery on sunlight can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a texturing method for polycrystalline silicon solar cells. Background technique [0002] A crystalline silicon solar cell is a device that effectively absorbs solar radiation energy and uses the photovoltaic effect to convert light energy into electrical energy. When sunlight shines on a semiconductor P-N junction (P-N Junction), a new hole-electron pair ( V-Epair), under the action of the P-N junction electric field, holes flow from the N region to the P region, electrons flow from the P region to the N region, and a current is formed after the circuit is turned on. [0003] The manufacturing process of crystalline silicon solar cells is divided into six major processes: texturing, diffusion, etching, front coating, screen printing, and sintering. Among them, the purpose of texturing is to form an uneven textured structure on the front of the silicon wafer, increase the ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18C30B33/10
CPCH01L31/0236Y02E10/50Y02P70/50
Inventor 方结彬秦崇德石强黄玉平何达能
Owner GUANGDONG AIKO SOLAR ENERGY TECH CO LTD