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Low-cost monocrystalline silicon wafer texturing additive

A cost-effective single crystal and additive technology, applied in crystal growth, post-processing details, post-processing, etc., can solve the problems of short storage time of texturing additives, unfavorable product quality control, harsh process conditions, etc., and achieve the suede pyramid. Uniform structure, low cost, and the effect of increasing the corrosion rate

Active Publication Date: 2013-02-06
贵州威顿晶磷电子材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the industrial application of the above additives, after each batch of texturing, it is necessary to add additives to the texturing liquid to maintain the texturing effect. The process conditions are harsh, it is not easy to operate, and it is easy to cause production losses.
Moreover, the texturing solution must be replaced after 12 hours (25 batches) of texturing, and the storage time of the texturing additive is short, which increases the cost of raw materials in the preparation of solar cells, and the process is complicated, which is not conducive to the control of product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 72g of water, 8g of sodium tartrate, 15g of beet molasses, and 5g of perfluoropolyoxyethylene ether to prepare an additive solution; dissolve 13g of sodium hydroxide and 50g of isopropanol in 930g of pure water to obtain a velvet-making solution, and add 7g at a time Add the above-mentioned additives to the above-mentioned texturing liquid to prepare a texturing liquid with additives; immerse the pretreated monocrystalline silicon wafer in the texturing liquid with additives, make texturing at a temperature of 75°C for 750s, and make texturing for 25 seconds. After batching, the size of the textured pyramids of the first batch, the 10th batch, and the 25th batch of silicon wafers were detected with a scanning electron microscope. The test results of the silicon wafers of the three batches of samples showed that the size of the textured pyramids was 1.5~2.5μm. And the size is uniform, there is no gap between adjacent pyramids; and the reflectivity of the suede surface...

Embodiment 2

[0024] Mix 61g of water, 10g of sodium tartrate, 2g of sodium salicylate, 3g of sodium edetate, 20g of soybean molasses, and 6g of potassium perfluorooctane sulfonate to prepare an additive solution; mix 13g of sodium hydroxide and 50g of isopropanol Dissolve it in 927g of pure water to obtain a texturing solution, add 10g of additives to the texturing solution at one time to prepare a texturing solution with additives; immerse the pretreated monocrystalline silicon wafer in the texturing solution, at 75°C Texture was made at high temperature for 780s. After 30 batches of texturing, the size of the pyramids of the textured surface of the 5th, 10th, and 30th batches of silicon wafers were detected with a scanning electron microscope. The test results of the silicon wafers of the three batches of samples showed that the textured surface The size of the pyramids is 1~3μm, and the size is uniform, and there is no gap between adjacent pyramids; and the reflectance of the suede surfa...

Embodiment 3

[0026] 71g water, 5g sodium tartrate, 5g sodium salicylate, 5g beet molasses, 10g grape molasses, 3g perfluoropolyoxyethyl ether, 1g perfluoroalkyl ether carboxylate were mixed to prepare additive solution; 13g sodium hydroxide and Dissolve 50g of isopropanol in 931g of pure water to obtain the texturing liquid, add 6g of additives to the texturing liquid at one time to prepare the texturing liquid with additives; In the velvet liquid, the velvet was made at a temperature of 70°C for 800s. After 25 batches of velvet, the pyramid size of the velvet surface of the 5th, 10th, and 25th batches of silicon wafers was detected with a scanning electron microscope. The test results of the silicon wafer show that the size of the textured pyramids is 1~2.5μm, and the size is uniform, and there is no gap between adjacent pyramids; and the reflectivity of the textured surface is 7.8%, 7.7%, 7.6%.

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Abstract

The invention relates to a low-cost monocrystalline silicon wafer texturing additive and belongs to the technical field of solar cells. The additive is composed of a complexing agent, molasses, a perfluorinated surfactant and deionized water. During texturing on a monocrystalline silicon wafer of a solar cell, the additive is added by an amount of 0.3%-1.2%, therefore uniform and fine pyramid texture can be obtained, silicon wafer reflectivity can be reduced, and the efficiency of the solar cell can be improved. Additionally, the additive is not needed to refill during the texturing process. The additive is provided with a wide technological operation range and a high solution storage life, therefore the texturing quality is improved greatly, the technological operation is simple, and the cost is low.

Description

technical field [0001] The method relates to the technical field of crystalline silicon solar cell production, in particular to a low-cost monocrystalline silicon wafer texturing additive. Background technique [0002] After the sunlight radiates to the silicon chip covered with suede pyramids, the reflected sunlight radiates to another pyramid, forming multiple reflections, thereby increasing the absorption of sunlight. Moreover, the PN junction area after texturing is much larger than that of the light plane, so the efficiency of solar cells can be greatly improved and the photovoltaic on-grid electricity price can be reduced. The most direct way to improve the efficiency of solar cells is to reduce the surface reflectance of silicon wafers. The lower the surface reflectance, the more photons are absorbed by the silicon wafers and converted into electrical energy. The higher the efficiency of solar cells, the lower the electricity price. . [0003] In the process of indu...

Claims

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Application Information

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IPC IPC(8): C30B33/10
Inventor 郭之军王天喜汪忠发赵和英程永福刘涛杨丰誉
Owner 贵州威顿晶磷电子材料股份有限公司
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