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Additives for monocrystalline silicon wafer alkaline environment-friendly non-alcoholic texturing liquid and its application method

An additive and monocrystalline silicon technology, applied in chemical instruments and methods, crystal growth, post-processing details, etc., can solve problems such as poor surface uniformity of silicon wafers, poor texture stability, and large corrosion of silicon wafers , to achieve the effect of improving photoelectric conversion efficiency, shortening the time of making texture, and uniform color

Active Publication Date: 2015-11-25
湖州叁峰能源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The texturing effect of this texturing liquid is not very ideal, and the existing problems include: the size of the pyramid is relatively large, generally 10-15 μm; the corrosion amount of the silicon wafer is relatively large; the stability of the texturing is not good; the silicon wafer after texturing The surface uniformity is not good, the decontamination ability is poor, and obvious fingerprints, white spots, etc. can often be seen
At the same time, due to the extensive use of isopropanol, a dangerous product that is flammable, explosive and volatile, the cost of production raw materials, transportation costs, and storage costs have greatly increased
At the same time, isopropanol is volatile, and there is a risk of explosion in the workshop. People who inhale a large amount of isopropanol can cause various occupational diseases. Long-term inhalation can even lead to various persistent diseases including lung cancer and leukemia.
Moreover, due to the large amount of isopropanol used in the corrosive solution, it causes environmental pollution and requires post-treatment, thereby increasing production costs

Method used

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  • Additives for monocrystalline silicon wafer alkaline environment-friendly non-alcoholic texturing liquid and its application method
  • Additives for monocrystalline silicon wafer alkaline environment-friendly non-alcoholic texturing liquid and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Prepare additives, take 0.05 grams of edible protein powder with more than 85% protein, take 0.01 grams of anionic surfactant (a kind of detergent), take 0.001 grams of vitamins, donkey-hide gelatin, and tea polyphenols, and 99.939 grams of deionized water. Dissolve protein powder, detergent, vitamins, donkey-hide gelatin, and tea polyphenols in deionized water to make a 100-gram solution.

[0037] Prepare the texturing solution, dissolve 5 grams of NaOH in 995 grams of deionized water to obtain 1000 grams of alkaline alcohol-free texturing solution; add 20 grams of additives to the 1000 grams of alkaline alcohol-free texturing solution.

[0038] The monocrystalline silicon wafers for solar cells are immersed in the texturing solution added with additives for surface texturing, the texturing temperature is 70°C, and the texturing time is 720s, and the texturing is completed.

Embodiment 2

[0040] Prepare additives, take 0.05 grams of edible protein powder with more than 85% protein, take 0.01 grams of anionic surfactant (a kind of detergent), take 0.001 grams of vitamins, donkey-hide gelatin, and tea polyphenols, and 99.939 grams of deionized water. Dissolve protein powder, detergent, vitamins, donkey-hide gelatin, and tea polyphenols in deionized water to make a 100-gram solution.

[0041] Prepare the texturing solution, dissolve 11 grams of NaOH in 989 grams of deionized water to obtain 1000 grams of alkaline alcohol-free texturing solution; add 25 grams of additives to the 1000 grams of alkaline alcohol-free texturing solution.

[0042] The monocrystalline silicon wafer for solar cells is immersed in the texturing solution added with additives for surface texturing, the texturing temperature is 75°C, and the texturing time is 900s, and the texturing is completed.

Embodiment 3

[0044] Prepare additives, take 1 gram of food foaming agent, 1 gram of household neutral surfactant (a kind of detergent), 0.003 grams of vitamins, donkey-hide gelatin, and tea polyphenols, and 97.997 grams of deionized water. Powder, detergent, vitamins, donkey-hide gelatin, and tea polyphenols were dissolved in deionized water to make a 100-gram solution.

[0045] Prepare the texturing solution, dissolve 100 grams of NaOH in 900 grams of deionized water to obtain 1000 grams of alkaline alcohol-free texturing solution; add 50 grams of additives to the 1000 grams of alkaline alcohol-free texturing solution.

[0046] The monocrystalline silicon wafer for solar cells is immersed in the texturing solution added with additives for surface texturing, the texturing temperature is 90° C., and the texturing time is 1200 s, and the texturing is completed.

[0047] see figure 1 as shown, figure 1 It is a comparison diagram of the scanning electron microscope plan view of the textured ...

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Abstract

The invention provides an additive for an alkali environment-protecting type no-alcoholic felting liquid of a mono-crystal silicone chip, which comprises the following components in percent by weight: 0.05 to 1 percent of protein, 0.01 to 1 percent of detergent, 0.001 to 0.003 percent of vitamin, donkey-hide gelatin or tea polyphenol or the combination thereof, and the balance of water. After adopting the additive for the alkali environment-protecting type no-alcoholic solution of the mono-crystal silicone chip and the using method thereof, compared with the condition without the additive for an alkali environment-protecting type no-alcoholic felting liquid of a mono-crystal silicone chip, the felt temperature can be decreased, no isopropanol is required to be used, the felting time is shortened, and the felting effect is obviously improved.

Description

【Technical field】 [0001] The invention relates to the field of manufacturing silicon wafers for solar cells, in particular to an environment-friendly additive for alcohol-free monocrystalline silicon wafer alkaline texturizing liquid in the manufacturing of silicon wafers and a method for using the same. 【Background technique】 [0002] In the process of preparing a solar cell single wafer, in order to improve the performance and photoelectric conversion efficiency of the solar cell, the surface of the silicon wafer must be roughened to make the sunlight incident on the silicon surface form a diffuse reflection. On the one hand, the optical path is extended, thereby increasing the absorption rate of infrared light by the silicon wafer; on the other hand, more photons are absorbed in the area near the PN junction, generating photo-generated carriers, and these photo-generated carriers It is easier to be collected because there is a built-in electric field near the PN junction,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B33/10C23F1/32
Inventor 韩庚欣徐涛
Owner 湖州叁峰能源新材料有限公司
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