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Additive for diamond linear cutting monocrystalline silicon wafer suede manufacture and application method of additive

A diamond wire cutting, single crystal silicon wafer technology, applied in the field of solar cells, can solve the problems of reducing the photoelectric conversion efficiency of solar cells, high requirements on the surface state of the original silicon wafer, affecting the appearance and reflectivity of the silicon wafer, and reducing light reflection. efficiency, simple equipment and process of use, and reduced chemical consumption

Inactive Publication Date: 2016-12-14
杭州飞鹿新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: high requirements on the surface state of the original silicon wafer, difficult control of the texturing process, high difficulty in operation, large volatilization of isopropanol, uneven textured pyramid, resulting in high rework rate of textured appearance, Problems such as low cell conversion rate
[0005] At present, although the diamond wire-cut single crystal silicon wafer has basically solved the problem of texturing by using the optimized alkali solution system and the texturing additive process, the thickness of the damaged layer and the defects on the surface of the diamond wire-cut silicon wafer are lower than those of the mortar wire-cut silicon wafer. It is less, and there are serious cutting lines on the surface of the diamond wire-cut silicon wafer, so that there are still more or less line marks on the surface of the silicon wafer after wet texturing, which is difficult to completely eliminate, thus affecting the appearance and reflection of the silicon wafer after texturing rate, reducing the photoelectric conversion efficiency of solar cells

Method used

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  • Additive for diamond linear cutting monocrystalline silicon wafer suede manufacture and application method of additive
  • Additive for diamond linear cutting monocrystalline silicon wafer suede manufacture and application method of additive
  • Additive for diamond linear cutting monocrystalline silicon wafer suede manufacture and application method of additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] comparison group

[0032] The current conventional alkaline cashmere method:

[0033] Dissolve 20 grams of NaOH in 940 grams of deionized water, add 40 grams of isopropanol to obtain 1000 grams of alkaline alcohol-containing texturing liquid; add 3 grams of alcoholic additives to 1000 grams of alkaline alcohol-containing texturing liquid.

[0034] The diamond wire-cut solar monocrystalline silicon wafer is immersed in the texturing solution added with additives for surface texturing, the texturing temperature is 80°C, and the texturing time is 900s, and the texturing is completed.

[0035] figure 1 It is the scanning electron microscope plan view of the silicon wafer prepared by the traditional alkaline texturizing solution in this example.

[0036] figure 1 It can be seen that the size of the textured pyramid made by the traditional alkaline texturing liquid is large, the distribution is sparse and uneven, and the size is 2-6 μm. The diamond wire cutting marks are s...

Embodiment 2

[0038] To configure additives, take 0.05 grams of polyethyleneimine (mw: 600), take 1 gram of polyethylene glycol (mw: 400), 3 grams of polyethylene glycol (mw: 200), and 0.5 grams of disodium edetate , 1 gram of trisodium phosphate, 1 gram of disodium hydrogen phosphate, 0.05 grams each of gelatin, caramel, and riboflavin, and 93.3 grams of deionized water, and polyethyleneimine, polyethylene glycol, and ethylenediaminetetra Disodium acetate, trisodium phosphate, disodium hydrogen phosphate, gelatin, caramel, and riboflavin were dissolved in deionized water to make a 100 g solution.

[0039] Prepare texturing liquid, dissolve 20 grams of NaOH in 980 grams of deionized water to obtain 1000 grams of alkaline alcohol-free texturing liquid; add 10 grams of alcohol-free additives to 1000 grams of alkaline alcohol-free texturing liquid.

[0040] The diamond wire-cut solar monocrystalline silicon wafer is immersed in the texturing solution added with additives for surface texturing,...

Embodiment 3

[0045] Prepare additives, take 0.05 grams of polyvinyl alcohol (1788), take 1 gram of polyethylene glycol (mw: 400), 1 gram of sodium polyacrylate, 0.1 gram of sodium carboxymethyl cellulose, riboflavin, folic acid, and amino acids. 0.05 grams, and 97.7 grams of deionized water, polyvinyl alcohol, polyethylene glycol, sodium polyacrylate, sodium carboxymethylcellulose, riboflavin, folic acid, amino acids are dissolved in deionized water to make 100 grams of solution.

[0046] Prepare the texturing solution, dissolve 15 grams of NaOH in 985 grams of deionized water to obtain 1000 grams of alkaline alcohol-free texturing solution; add 5 grams of additives to the 1000 grams of alkaline alcohol-free texturing solution.

[0047] The diamond wire-cut solar monocrystalline silicon wafer is immersed in the texturing solution added with additives for surface texturing, the texturing temperature is 80°C, and the texturing time is 900s, and the texturing is completed.

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Abstract

The invention provides an additive for diamond linear cutting monocrystalline silicon wafer suede manufacture. The additive comprises the following components in weight percentage, 0.05-5% of defoaming agents, 1-10% of stain removers, 0.01-1% of suede optimizers and the balance water. The additive is simple in formula, convenient to operate, simple in flocking process and good in flocking repeatability, chemical consumption and production cost are reduced, and alcohols such as isopropanol or ethyl alcohol are omitted. When the additive is applied to diamond linear cutting monocrystalline silicon wafer suede manufacture, the additive has an excellent surface cutting mark eliminating effect, surfaces are black and clean, uniform, small and dense suede pyramids can be obtained, the size of each pyramid ranges from 2 micrometers to 3 micrometers, the light reflectivity of monocrystalline silicon wafers is reduced, and battery piece conversion efficiency is correspondingly improved.

Description

technical field [0001] The invention relates to an additive for making texturing of a diamond wire-cut monocrystalline silicon wafer and an application method thereof, belonging to the technical field of solar cells. Background technique [0002] As a widely distributed green, non-polluting and clean energy, solar energy is the preferred energy source for sustainable development. The solar photovoltaic industry is an important development direction of global energy technology and industry. It is a sunrise industry with great development potential. In order to promote a major transformation of the country's economic growth model, countries all over the world attach great importance to the development of the solar photovoltaic industry and have introduced industrial support policies. Seize the strategic commanding heights in the future new energy era. [0003] With the rapid development of the photovoltaic industry, crystalline silicon slices are expected to maintain an annua...

Claims

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Application Information

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IPC IPC(8): C30B33/10C30B29/06H01L31/18
CPCC30B29/06C30B33/10H01L31/1804Y02P70/50
Inventor 夏庆华斯小阳姚伟明
Owner 杭州飞鹿新能源科技有限公司
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