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Additive for texturing solution of monocrystalline silicon

A technology of additives and texturing fluid, which is applied in the field of solar cells, can solve the problems of shortening time, pollution, and large amount of isopropanol, and achieve the effects of cost saving, pollution reduction, and short reaction time

Active Publication Date: 2012-11-21
718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the defect that the environment is polluted due to the large amount of isopropanol used in the existing texturing liquid, the purpose of the present invention is to provide a kind of additive for monocrystalline silicon texturing liquid, using said additive, can make In the case of not using isopropanol or ethanol in the monocrystalline silicon texturing liquid, the monocrystalline silicon wafer textured pyramid structure is uniform and fine, and the reaction temperature can be lowered and the time can be shortened.

Method used

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  • Additive for texturing solution of monocrystalline silicon

Examples

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Effect test

Embodiment 1

[0028] 1) Preparation of additives: Dissolve 1 g of fructose, 50 g of sodium silicate, 60 g of sodium oxalate, 40 g of sodium lactate, and 20 g of nonylphenol polyoxyethylene ether in 829 g of deionized water at room temperature, and stir until completely dissolved to obtain 1000 g of additives.

[0029] 2) Preparation of alkaline texturing solution: 120 g of sodium hydroxide was dissolved in 9.88 kg of deionized water to obtain 10 kg of alkaline texturing solution.

[0030] 3) Add 150g of additives to 10kg of alkaline texturing liquid and mix well.

[0031] 4) Dip the cleaned silicon wafer into the alkaline texturing solution containing additives, and keep the temperature at 80°C for 12 minutes to complete the texturing. The silicon wafer is taken out from the alkaline texturizing solution, washed with deionized water and dried to obtain a blue-black shiny suede surface. The corroded mass of the silicon wafer after texturing is measured by an analytical balance is 0.3539g, ac...

Embodiment 2

[0033] 1) Prepare additives: at room temperature, mix 50g fructose, 35g sodium silicate, 35g sodium acetate, 5g F-containing nonionic surfactant FSO-100 ( , DuPont USA), 15g NP-10 was dissolved in 860g deionized water, stirred until completely dissolved, and 1000g additive was obtained.

[0034] 2) Dissolve 140g of sodium hydroxide in 9.86kg of deionized water to obtain 10kg of alkaline texturing solution.

[0035] 3) Add 30 grams of additives to 10 kg of alkaline texturing liquid and mix well.

[0036] 4) Dip the cleaned silicon wafer into the alkaline texturing solution containing additives, and keep the temperature at 75°C for 18 minutes to complete the texturing. The silicon wafer is taken out from the alkaline texturizing solution, washed with deionized water and dried to obtain a blue-black shiny suede surface. The corroded mass of the silicon wafer after texturing is measured by an analytical balance is 0.3308g, accounting for 4.9% of the mass of the silicon wafer be...

Embodiment 3

[0038] 1) Preparation of additives: at room temperature, mix 50g fructose, 100g sodium silicate, 1g sodium acetate, 1g F-containing nonionic surfactant FSO-100 ( , DuPont, USA) was dissolved in 848g of deionized water and stirred until completely dissolved to obtain 1000g of the additive.

[0039] 2) Dissolve 140g of sodium hydroxide in 9.86kg of deionized water to obtain 10kg of alkaline texturing solution.

[0040] 3) Add 100 grams of additives to 10 kg of alkaline texturing liquid and mix well.

[0041] 4) Dip the cleaned silicon wafer into the alkaline texturing solution containing additives, and keep the temperature at 85°C for 15 minutes to complete the texturing. The silicon wafer is taken out from the alkaline texturizing solution, washed with deionized water and dried to obtain a blue-black shiny suede surface. The corroded mass of the silicon wafer after the texturing is measured by an analytical balance is 0.3903g, accounting for 5.8% of the mass of the silicon w...

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Abstract

The invention discloses an additive for texturing solution of monocrystalline silicon, belonging to the field of solar cells. The additive has the following components by mass percentage: 0.1-10% of fructose, 1-10% of sodium silicate, 0.1-10% of organic acid salt, 0.1-5% of surfactant, and the balance of deionized water or water with a purity higher than that of the deionized water. By using the additive, the textured surface of the monocrystalline silicon wafer, which is prepared by the texturing solution of monocrystalline silicon in the absence of isopropanol or ethanolthe, has uniform and tiny pyramid structures; in addition, the reaction temperature can be reduced, and the time can be shortened.

Description

technical field [0001] The invention relates to an additive for monocrystalline silicon texturing liquid, which belongs to the field of solar cells. Background technique [0002] During the preparation of solar cells, it is necessary to make texture on the surface of silicon wafers. An effective textured structure can extend the optical path, increase the light absorption of the silicon wafer, and improve the efficiency of the solar cell. The textured surface of single crystal silicon wafers is usually obtained by reacting silicon wafers with alkaline texturing liquid. When the concentration of the alkaline solution is low, the corrosion rate of the alkaline solution on different crystal planes of the silicon wafer is different, and the corrosion rate on the (100) crystal plane is much higher than that on the (111) crystal plane. Form a pyramid-shaped suede. [0003] The main components of a typical alkaline texturing solution are sodium hydroxide (NaOH), isopropanol (IPA...

Claims

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Application Information

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IPC IPC(8): C30B33/10C23F1/32
Inventor 石晶吴小锋李杰刘保锋赵明闫云王晓利
Owner 718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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