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Texturing method for monocrystalline silicon pieces for batteries

A single crystal silicon wafer and battery technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve problems such as low efficiency, and achieve the effects of high efficiency, small size and high photoelectric conversion efficiency

Inactive Publication Date: 2018-04-24
DEQING LIJING ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing monocrystalline silicon texturing process usually requires 600 s-900 s of texturing time, and the efficiency is low. If the texturing time can be shortened, the production efficiency will be effectively improved

Method used

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  • Texturing method for monocrystalline silicon pieces for batteries
  • Texturing method for monocrystalline silicon pieces for batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The process steps are as follows:

[0011] 1. Configure texturing additives: 0.5 g of vinylpyrrolidone-vinylimidazole copolymer (number average molecular weight is ), 1 g of polyethylene glycol-polypropylene glycol-polyethylene glycol copolymer, 0.5 g of ethylenediaminetetra Acetic acid, 2 g monoethanolamine, 0.1 g sodium benzoate, and 0.25 g sodium p-toluenesulfonate were sequentially dissolved in 100 ml deionized water.

[0012] 2. Prepare lye: dissolve 10 g of sodium hydroxide in 990 g of deionized water to obtain an aqueous solution of sodium hydroxide with a mass fraction of 1%.

[0013] 3. Prepare alkaline texturing solution: mix the texturizing additive obtained in step 1 and the lye obtained in step 2 evenly at a mass ratio of 0.5:100.

[0014] 4. Texturing process: immerse the monocrystalline silicon wafer for solar cells into the alkaline texturing solution prepared in step 3 for surface texturing, and the texturing temperature is 85 o C, the texturing time ...

Embodiment 2

[0016] The process steps are as follows:

[0017] 1. Configure texturizing additives: 1 g of vinylpyrrolidone-vinylimidazole copolymer, 2 g of polyethylene glycol-polypropylene glycol-polyethylene glycol copolymer, 0.1 g of ethylenediaminetetraacetic acid, 0.5 g of monoethanolamine , 0.05 g sodium benzoate and 0.5 g sodium p-toluenesulfonate were successively dissolved in 100 ml deionized water.

[0018] 2. Prepare lye: dissolve 15 g of potassium hydroxide in 985 g of deionized water to obtain an aqueous solution of potassium hydroxide with a mass fraction of 1.5%.

[0019] 3. Prepare alkaline texturing solution: mix the texturizing additive obtained in step 1 and the lye obtained in step 2 evenly at a mass ratio of 1:100.

[0020] 4. Texturing process: immerse the monocrystalline silicon wafer for solar cells into the alkaline texturing solution prepared in step 3 for surface texturing, and the texturing temperature is 75 o C, the texturing time is 420 s.

Embodiment 3

[0022] The process steps are as follows:

[0023] 1. Configure texturizing additives: 2 g of vinylpyrrolidone-vinylimidazole copolymer, 1 g of polyethylene glycol-polypropylene glycol-polyethylene glycol copolymer, 0.5 ethylenediaminetetraacetic acid, monoethanolamine 3, benzene Dissolve 0.1 g of sodium formate and 0.5 g of sodium p-toluenesulfonate into 100 ml of deionized water in turn.

[0024] 2. Prepare lye: dissolve 20 g of sodium hydroxide in 980 g of deionized water to obtain an aqueous solution of sodium hydroxide with a mass fraction of 2%.

[0025] 3. Prepare alkaline texturing solution: mix the texturizing additive obtained in step 1 and the lye obtained in step 2 evenly in a mass ratio of 0.1:100.

[0026] 4. Texturing process: immerse the monocrystalline silicon wafer for solar cells into the alkaline texturing solution prepared in step 3 for surface texturing, and the texturing temperature is 88 o C, the texturing time is 300 s.

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Abstract

The invention provides a texturing method for monocrystalline silicon pieces for batteries. The texturing method comprises the following steps: dissolving a vinyl pyrrolidone-vinyl imidazole copolymer, a polyethylene glycol-polypropylene glycol-polyethylene glycol copolymer, edetic acid, monoethanolamine, sodium benzoate and paratoluenesulfonic acid sodium salt in the balance of water; adding a texturing additive prepared in step (1) in an alkaline solution, and mixing uniformly; and placing monocrystalline silicon pieces in texturing liquid prepared in step (2) and carrying out texturing. When the monocrystalline silicon pieces are subjected to texturing by the method, the texturing additive in the patent is added in the alkaline solution according a certain proportion, and thus, a rapidtexturing effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic cells, in particular to a texturing method for monocrystalline silicon wafers for cells. Background technique [0002] The lye etches the [100] crystal plane of the single crystal silicon wafer faster, but the etching of the [111] crystal plane is slower. The resulting difference in etching rate will lead to the formation of a pyramid structure on the surface of the single crystal silicon wafer during the process of etching the silicon wafer with alkaline solution. The structure can effectively reduce the light reflection of the silicon wafer. In the preparation process of solar cells, the lower the reflection of silicon wafers to light, the more the absorption of light by silicon wafers, and the higher the conversion efficiency of solar cells. Texturing the surface of a single crystal silicon wafer by the above alkali etching method is one of the commonly used effective ways to incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/10C30B29/06H01L31/18
CPCC30B29/06C30B33/10H01L31/1804Y02P70/50
Inventor 姜翰钦吴金丹周小国
Owner DEQING LIJING ENERGY TECH CO LTD
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