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

A technology of texturing fluid and additives, which is applied in the direction of sustainable manufacturing/processing, final product manufacturing, electrical components, etc., and can solve the problems of poor surface uniformity of silicon wafers, poor stability of texturing, and large corrosion of silicon wafers, etc. 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 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

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Effect test

Embodiment 1

[0020] Take the following process steps: 1) Prepare additives: use 100 ml of deionized water as a solvent, dissolve 5 ml of lactic acid and 0.5 g of vitamin C in deionized water; 2) configure alkaline texturing liquid: mix 11 g of NaOH and 60 g of isopropyl Alcohol is dissolved in deionized water to obtain 1000 grams of solution; 3) Add 20 grams of additives by weight to 1000 grams of alkaline texturing solution; 4) Immerse monocrystalline silicon wafers for solar cells in the texturing solution Surface texturing, texturing temperature is 75℃, texturing time is 900s.

[0021] figure 1 The scanning electron microscope plane photograph of the textured surface of the obtained silicon wafer is given. From the figure, it can be seen that the pyramid size is small, about 2-4 μm, and the distribution is relatively uniform. figure 2 The reflection spectrum of the surface texture of the prepared silicon wafer is given. It can be seen from the figure that the surface texture of the silico...

Embodiment 2

[0023] The following process steps are adopted: 1) Preparation of additives: using 100 ml of deionized water as a solvent, 3 ml of lactic acid and 0.3 g of vitamin C are dissolved in deionized water; 2) preparation of alkaline texturing liquid: the weight percentage is 1.1% NaOH and 6% isopropanol are dissolved in deionized water; 3) Add 15 grams of additives by weight to 1000 grams of alkaline texturing solution; 4) Immerse the monocrystalline silicon wafers for solar cells in the texturing solution Perform 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: 1 ml of lactic acid and 0.1 g of vitamin C are dissolved in deionized water with 100 ml of deionized water as a solvent; 2) Alkaline texturing liquid: the weight percentage is 1.1% NaOH and 6% isopropanol are dissolved in deionized water; 3) Add 10 grams of additives by weight to 1000 grams of alkaline texturing solution; 4) Immerse the solar cell monocrystalline silicon wafers in the texturing solution Carry out surface texturing, texturing temperature is 80℃, texturing 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 for monocrystalline silicon wafer texturing liquid and a use method. Background technique [0002] In the solar cell preparation process, in order to improve the performance and efficiency of the solar cell, it is necessary to make a suede on the surface of the silicon wafer. The effective suede structure can make incident sunlight reflect and refract on the surface of the silicon wafer multiple times, changing the incident light The way forward in silicon. On the one hand, the optical path is extended, thereby increasing the absorption rate of the silicon wafer for infrared light; on the other hand, more photons are absorbed in the region near the pn junction to generate photo-generated carriers, which are more It is easy to be collected, thus increasing the collection efficiency of photogenerated carriers. The texture of the monocrystalline silicon battery is usually formed by etching the surface of the silicon wafer...

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 符黎明陈培良
Owner CHANGZHOU SHICHUANG ENERGY CO LTD
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