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Additive for acidic texturing agent for polycrystalline silicon solar battery sheet

A solar cell and texturing agent technology, which is applied in the field of additives, can solve the problems of uneven texture of wafers, low photoelectric conversion efficiency, and large thinning of silicon wafers, and achieves simple preparation and use processes and improved photoelectric conversion efficiency. , the effect of small suede size

Inactive Publication Date: 2011-05-18
DALIAN SANDAAOKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing acidic texturing liquid reacts very violently during the texturing process, and its formula and reaction conditions are in an unstable state. Therefore, it is difficult to control the texturing process, and the thinning of silicon wafers is relatively large, which makes it easy for polycrystalline silicon wafers to process. Cracks, uneven suede formed by the wafer, and large pyramidal structure size, resulting in high reflectivity of the wafer, small short-circuit current, and low photoelectric conversion efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Phosphoric acid (H 3 PO 4 ), sulfuric acid (H 2 SO 4 ) and pure water, the mass percentage of each raw material is: 5%-30% of phosphoric acid, 5%-10% of sulfuric acid, and the balance of pure water.

[0014] Each raw material is selected within its weight range, and the total weight is 100%.

[0015] Preparation of additives: Add pure water into the agitator, add sulfuric acid and phosphoric acid according to the mass percentage under rapid agitation, continue to agitate and cool to normal temperature.

[0016] When in use, the embodiment 1 of the present invention is added into the existing acidic texturing liquid as an additive, and the mass ratio of the embodiment 1 of the present invention to the acidic texturing liquid is 1-20:100. The polycrystalline silicon wafer is immersed in the texturing solution added with the embodiment 1 of the present invention for texturing at a temperature of 60-70° C. for 5-15 minutes.

Embodiment 2

[0018] Phosphoric acid (H 3 PO 4 ), sulfuric acid (H 2 SO 4 ) and pure water to prepare 100g of solution, the mass percent of each raw material is: phosphoric acid 5%, sulfuric acid 5%, pure water 90%.

[0019] The preparation method is the same as in Example 1.

[0020] When in use, the embodiment 2 of the present invention is added into the existing 1000g acidic texturing liquid as an additive. The polycrystalline silicon wafer is immersed in the texturing solution added with Example 2 of the present invention for texturing at a temperature of 60° C. for 10 minutes. The textured structure on the surface of the obtained silicon wafer is small in size, uniform in distribution, and low in reflectivity, with an average reflectivity of 13%.

Embodiment 3

[0022] Phosphoric acid (H 3 PO 4 ), sulfuric acid (H 2 SO 4 ) and pure water to prepare 40g of solution, the mass percent of each raw material is: phosphoric acid 30%, sulfuric acid 10%, pure water 60%.

[0023] The preparation method is the same as in Example 1.

[0024] When in use, the embodiment 3 of the present invention is added as an additive to the existing 1000g acidic texturing liquid. The polycrystalline silicon wafer was immersed in the texturing solution added with Example 3 of the present invention for texturing at a temperature of 70° C. for 8 minutes. The textured structure on the surface of the obtained silicon wafer is small in size, uniform in distribution, and low in reflectivity, with an average reflectivity of 13.5%.

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Abstract

The invention discloses an additive for an acidic texturing agent for a polycrystalline silicon solar battery sheet, which is prepared from the following raw materials in percentage by mass: 5 to 30 percent of phosphoric acid, 5 to 10 percent of sulfuric acid and the balance of pure water. The invention has the advantages that: the additive has the stabilizing effect on the acidic texturing liquid and can reduce texturing temperature and shorten texturing time, and a process condition is easy to control; the size of a formed texture is fine, the distribution is more uniform, the reflectivity of a silicon wafer is reduced, the short-circuit current of the battery sheet is improved, the fill factor of the battery sheet is increased, and the photoelectric conversion efficiency of the solar battery sheet is improved; and preparation and using processes are simple, and the repeatability is high.

Description

Technical field: [0001] The invention relates to an additive in the texturing process of a polycrystalline silicon solar cell, in particular to an additive for an acidic texturing agent for a polycrystalline silicon solar cell which has a simple texturing process and good repeatability and can improve photoelectric conversion efficiency. Background technique: [0002] Currently, polysilicon solar cells account for the largest share (greater than 60%) of the solar photovoltaic market. In the production of polycrystalline silicon solar cells, surface texturing (texturing) of polycrystalline silicon wafers plays an important role in reducing surface reflection, and is also one of the effective means to improve the photoelectric conversion efficiency of the surface of solar cells. At present, the textured methods of industrial production of polycrystalline silicon cells mainly include vapor deposition of SiN film, ion etching, mechanical grooving and isotropic acid etching, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/53
Inventor 侯军陈贵才
Owner DALIAN SANDAAOKE CHEM
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