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

A technology of texturing liquid and additives, which is applied in the direction of sustainable manufacturing/processing, climate sustainability, and final product manufacturing, and can solve the problems of poor surface uniformity of silicon wafers, poor texture stability, and corrosion of silicon wafers. Large and other problems, to achieve the effect of improving photoelectric conversion efficiency, shortening the time of making texture, and good repeatability

Active Publication Date: 2011-03-23
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 alkali wool making solution for monocrystalline silicon pieces and using method
  • Additive of alkali wool making solution for monocrystalline silicon pieces and using method
  • Additive of alkali wool making solution for monocrystalline silicon pieces and using method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take the following process steps: 1) Prepare additives: dissolve 2 grams of urea and 2 grams of sorbitol in deionized water to obtain 100 grams of solution; Dissolve in deionized water to obtain 1000 grams of solution; 3) Add 20 grams of additives in weight percent to 1000 grams of alkaline texturing solution; 4) Immerse monocrystalline silicon wafers for solar cells into the additive-added manufacturing The surface texture is carried out in the texture liquid, the texture temperature is 75°C, and the texture time is 900s.

[0028] figure 1 A scanning electron microscope plane photo of the textured surface of the obtained silicon wafer is given. It can be seen from the picture that the size of the formed pyramids is small, about 1-4 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 silico...

Embodiment 2

[0030] The following process steps are taken: 1) preparation of additives: 1 gram of urea and 1.5 grams of sorbitol are dissolved in deionized water to obtain 100 grams of sorbitol; 2) configuration of alkaline texturing solution: 11 grams of NaOH and 60 grams of isopropyl alcohol Dissolve in deionized water to obtain 1000 grams of solution; 3) Add 25 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 For velvet making, the velvet making temperature is 70°C, and the velvet making time is 800s.

Embodiment 3

[0032] Take the following process steps: 1) Prepare additives: dissolve 0.5 gram of urea and 1 gram of sorbitol in deionized water to obtain 100 grams of solution; 2) configure alkaline texturing solution: mix 11 grams of NaOH and 60 grams of isopropanol Dissolved in deionized water to obtain 1000 grams of solution; 3) Adding 30 grams of additives in weight percent to 1000 grams of alkaline texturing liquid; 4) Immersing monocrystalline silicon wafers for solar cells in the texturing liquid for surface For velvet making, the velvet making temperature is 80°C, and the velvet making time is 720s.

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Abstract

The invention relates to an additive of an alkali wool making solution for monocrystalline silicon pieces, containing the components of urea (carbamide), sorbic alcohol 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 an alkaline texturizing liquid for monocrystalline silicon wafers. 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/10H01L31/18
CPCY02P70/50
Inventor 符黎明符涛
Owner CHANGZHOU SHICHUANG ENERGY CO LTD
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