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Monocrystalline silicon system flocking additive for crystalline silicon solar battery

A technology of solar cells and additives, applied in crystal growth, post-processing details, post-processing, etc., can solve problems such as high cost and unbalanced ratio of liquid medicine

Inactive Publication Date: 2014-01-15
SHANGHAI HANYAO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boiling point of isopropanol is relatively low, around 82°C, so isopropanol will volatilize during the reaction, resulting in an imbalance in the ratio of the chemical solution in the texturing tank. In order to compensate for the decrease in isopropanol, it is necessary to Add isopropanol after the batch to make up for its volatilization, which leads to the consumption of isopropanol, which accounts for a large cost in texturing, and also has a certain impact on water treatment and production environment

Method used

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  • Monocrystalline silicon system flocking additive for crystalline silicon solar battery
  • Monocrystalline silicon system flocking additive for crystalline silicon solar battery
  • Monocrystalline silicon system flocking additive for crystalline silicon solar battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Texturing additive ratio is:

[0027] Glycerin polyoxypropylene ether is 1%, fatty amine polyoxyethylene ether is 0.05%, methyl pyruvate is 5%, vitamin C is 0.1%, oxalic acid is 3%, lactic acid is 5%, NaOH is 2%, and the rest is Deionized water.

[0028] Add 1000ml of texturing additive according to the above formula into a 150L single crystal texturing tank. The NaOH content in the texturing tank has been configured to be 1.8%. The temperature of the texturing tank is controlled at 80°C. The sheet is soaked into the texture-making tank for reaction, and the texture-making time is controlled at 900 seconds to 1200 seconds, and the average size of the obtained texture pyramid is about 3-4um. Each subsequent batch (the number of silicon wafers in a batch is 200-400 pieces) only needs to add 200-300 grams of NaOH and 20ml of additives.

[0029] After the above method continues to produce 40-60 batches, due to the reflection of the product Na in the texturing tank 2 SiO ...

Embodiment 2

[0031] Texturing additive ratio is:

[0032] Glycerin polyoxypropylene ether is 1.5%, fatty amine polyoxyethylene ether is 0.03%, methyl pyruvate is 2.5%, vitamin C is 1.5%, oxalic acid is 1.5%, lactic acid is 2.5%, and NaOH is 1%. ionized water.

[0033] Add 1000ml of the texturing additive prepared according to the above formula into a 100L single crystal texturing tank. The NaOH content in the texturing tank has been configured to be 1.8%. The temperature of the texturing tank is controlled at 80°C. The sheet is soaked in the texturing tank for reaction, and the texturing time is controlled at 1200 seconds to 1500 seconds, and the average size of the obtained texture pyramid is about 2um. Each subsequent batch (the number of silicon wafers in a batch is 300-400 pieces) needs to add 200-300 grams of NaOH and 20ml of additives;

[0034] After the above method continues to produce 40-60 batches, due to the reaction product Na in the texturing tank 2 SiO 3 If the content is...

Embodiment 3

[0036] Texturing additive ratio is:

[0037] Glycerin polyoxypropylene ether is 2%, fatty amine polyoxyethylene ether is 0.01%, methyl pyruvate is 0.5%, vitamin C is 5%, oxalic acid is 0.1%, lactic acid is 0.1%, NaOH is 0.1%, and the rest is Deionized water.

[0038] Add 1000ml of the texturing additive prepared according to the above formula into a 100L single crystal texturing tank. The NaOH content in the texturing tank has been configured to be 1.8%. The temperature of the texturing tank is controlled at 80°C. The sheet is soaked in the texturing tank for reaction, and the texturing time is controlled at 1200 seconds to 1500 seconds, and the average size of the obtained texture pyramid is about 2um. Each subsequent batch (the number of silicon wafers in a batch is 300-400 pieces) needs to add 200-300 grams of NaOH and 20ml of additives;

[0039] After the above method continues to produce 40-60 batches, due to the reaction product Na in the texturing tank 2 SiO 3 If th...

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Abstract

The invention aims to disclose a monocrystalline silicon system flocking additive for a crystalline silicon solar battery. The monocrystalline silicon system flocking additive comprises the following components in percentage by mass: 1-2% of poly(propylene glycol), 0.01-0.05% of fatty amine polyoxyethylene ether, 0.5-5% of methyl pyruvate, 0.1-5% of vitamin C, 0.1-3% of oxalic acid, 0.1-5% of lactic acid, 0.1-2% of alkali and the balance of deionized water. Compared with the prior art, the monocrystalline silicon system flocking additive with the formula has the advantages that the size of a monocrystalline suede coating pyramid can be well controlled, and a suede coating structure with good uniformity and high density is obtained; the etching thinning weight of a monocrystalline silicon chip is stable and can be controlled at 5-8%; the appearance of the silicon chip is uniform in color, and the average reflectivity is lower than 15%, so that the requirements for industrial production are met, and the aim of the invention is achieved.

Description

technical field [0001] The invention relates to a texturing additive, in particular to a crystalline silicon solar cell texturing additive suitable for the texturing process in the monocrystalline silicon solar cell manufacturing process. Background technique [0002] The preparation process of traditional crystalline silicon solar cells mainly includes six steps: (1) chemical etching thinning, texturing and cleaning; (2) diffusion to prepare PN junction; (3) etching to remove the surface phosphosilicate glass and edge PN junction; (4) Preparation of anti-reflection passivation silicon nitride film; (5) Screen printing electrodes and sintering; (6) Battery testing and sorting. Solar cells based on monocrystalline silicon crystals are prepared through the above steps, and then crystalline silicon is made into components through component packaging technology for photovoltaic power generation. [0003] The main function of etching in the above steps to prepare the textured su...

Claims

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Application Information

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IPC IPC(8): C30B33/10
Inventor 王鑫胡小丽何煊
Owner SHANGHAI HANYAO NEW MATERIAL TECH
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