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Additive of wool making solution for monocrystalline silicon pieces and using method

A monocrystalline silicon wafer and texturing liquid technology, applied in sustainable manufacturing/processing, final product manufacturing, electrical components, etc., can solve the problem of poor surface uniformity of silicon wafers, poor texturing stability, and silicon wafer corrosion Large volume and other problems, to achieve the effect of improving photoelectric conversion efficiency, shortening the time of making texture, and good repeatability

Active Publication Date: 2010-10-06
CHANGZHOU SHICHUANG ENERGY CO LTD
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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, and obvious fingerprints, white spots, etc. can often be seen

Method used

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  • Additive of wool making solution for monocrystalline silicon pieces and using method
  • Additive of wool making solution for monocrystalline silicon pieces and using method
  • Additive of wool making solution for monocrystalline silicon pieces and using method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take the following process steps: 1) Preparation of additives: 100 ml of deionized water is used as a solvent, 5 ml of lactic acid and 0.5 gram of vitamin C are dissolved in deionized water; Alcohol is dissolved in deionized water to obtain 1000 grams of solution; 3) 20 grams of additives are added in 1000 grams of alkaline texturing liquid; 4) monocrystalline silicon wafers for solar cells are immersed in the texturing liquid for The surface is textured, the texture temperature is 75°C, and the texture time is 900s.

[0021] figure 1 A scanning electron microscope planar photo of the textured surface of the obtained silicon wafer is given. It can be seen from the figure that the size of the formed pyramids is small, about 2-4 μm, and the distribution is relatively uniform. figure 2 The reflectance spectrum of the textured surface of the prepared silicon wafer is given, and it can be seen from the figure that the reflectance of the textured surface of the silicon wafe...

Embodiment 2

[0023] The following process steps are taken: 1) preparation of additives: 100 ml of deionized water is used as a solvent, 3 ml of lactic acid and 0.3 gram of vitamin C are dissolved in deionized water; Dissolve NaOH and 6% isopropanol in deionized water; 3) Add 15 grams of additives in weight percent to 1000 grams of alkaline texturing liquid; 4) Immerse the monocrystalline silicon wafer for solar cells in the texturing liquid Carry out surface texturing, the texturing temperature is 70°C, and the texturing time is 800s.

Embodiment 3

[0025] The following process steps are taken: 1) preparation of additives: using 100 ml of deionized water as a solvent, 1 ml of lactic acid and 0.1 gram of vitamin C are dissolved in deionized water; Dissolving NaOH and 6% isopropanol in deionized water; 3) adding 10 grams of additives in percentage by weight in 1000 grams of alkaline texturing liquid; 4) immersing the monocrystalline silicon wafer for solar cells in the texturing liquid Carry out surface velvet making, velvet making temperature is 80 ℃, and velvet making time is 720s.

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Abstract

The invention relates to an additive of a wool making solution for monocrystalline silicon pieces, containing the components of lactic acid, vitamin and the balance of water. When the monocrystalline silicon pieces for solar cells are subjected to surface wool making, the additive is added in the alkali wool making solution so that an excellent wool making effect is achieved.

Description

technical field [0001] The invention relates to an additive and a using method of a monocrystalline silicon wafer texturing liquid. Background technique [0002] In the process of preparing solar cells, in order to improve the performance and efficiency of solar cells, it is necessary to make a textured surface on the surface of the silicon wafer. The effective textured structure can make the incident sunlight reflect and refract multiple times on the surface of the silicon wafer, changing the incident light. The way forward in silicon. 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 to generate photo-generated carriers, and these photo-generated carriers are more It is easy to be collected, thus increasing the collection efficiency of photogenerated carriers. The textured surface of a monocrystalline silicon cell is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/10H01L31/18
CPCY02P70/50
Inventor 符黎明陈培良
Owner CHANGZHOU SHICHUANG ENERGY CO LTD
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