Binder for back electrode silver paste and preparation method thereof

A backside electrode and binder technology, applied in the direction of adhesives, binder types, polysaccharide binders, etc., can solve the problems of insufficient photoelectric conversion rate of batteries and weak adhesion with silicon plates, etc., to achieve strong adhesion, Good adaptability and high light conversion rate

Active Publication Date: 2021-06-18
JIANGSU RIYU PHOTOVOTTAIC NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main problems of polysilicon solar cells are: 1. The adhesion of the back electrode paste to the silicon plate is not strong after sintering
2. The photoelectric conversion rate of the battery is not enough

Method used

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  • Binder for back electrode silver paste and preparation method thereof
  • Binder for back electrode silver paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] According to a preferred embodiment of the present invention, the binder for the back electrode silver paste includes the following components in parts by weight: 3-5 parts of gum arabic, 2-4 parts of alginate, 0.4-1 part of squash gum, 0.2-0.4 parts of castor oil, 0.2-0.5 parts of carboxymethyl cellulose, 1-3 parts of sodium lauryl sulfate, 20 parts of water; and the castor oil, carboxymethyl cellulose and sodium lauryl sulfate The weight ratio is 0.24-0.3:0.35-0.4:1.

[0025] The second aspect of the present invention provides a kind of preparation method of described back electrode silver paste binder, and this method comprises:

[0026] (1) Gum Arabic, alginate, and safflower gum are mixed and ground, and dissolved in part of water to form a binder solution;

[0027] (2) The remaining water and sodium lauryl sulfate are mixed for the first time, then castor oil and carboxymethyl cellulose are added for the second mixing to obtain the mixture;

[0028] (3) Stir the...

Embodiment 1

[0042] (1) Gum Arabic, alginate, and safflower gum are mixed and ground, and dissolved in part of water to form a binder solution;

[0043] (2) first mixing the remaining water and sodium lauryl sulfate, then adding castor oil and mixing, then adding carboxymethyl cellulose and mixing to obtain the mixture;

[0044] (3) Stir the binder solution and the mixture to obtain a binder.

[0045] The dosage and process parameters of the above-mentioned raw materials are shown in Table 1.

[0046] The bonding strength of the obtained adhesive was measured according to GB / T 1742-1979, as shown in Table 2. According to the method of CN105469854B, a polycrystalline silicon solar cell was fabricated, and its photoelectric conversion efficiency was measured, as shown in Table 2.

Embodiment 2-3

[0048] According to the method of Example 1, the difference is that the amount of raw materials shown in Table 1 and the process parameters are used.

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Abstract

The invention relates to the technical field of binders for electrode silver paste, in particular to a binder for back electrode silver paste and a preparation method thereof. The binder comprises the following components in parts by weight: 3-8 parts of Arabic gum, 2-7 parts of algin, 0.4-1.5 parts of sesbania gum, 0.2-0.6 part of castor oil, 0.2-0.8 part of carboxymethylcellulose, 1-4 parts of lauryl sodium sulfate and 20 parts of water. According to the invention, the binder is a water-based binder, has high bonding strength, has strong adhesive force with a silicon plate after being used for sintering the back electrode paste, has high light conversion rate, adopts water as a solvent, and is green and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of a binder for electrode silver paste, in particular to a binder for back electrode silver paste and a preparation method thereof. Background technique [0002] With the development of my country's science and technology and the development of optoelectronics and communication industries, crystalline silicon solar cells have been widely promoted and applied. Crystalline silicon solar cells are the core part of the solar power generation system, and also the most valuable part of the solar power generation system. Push the load to work. Solar monocrystalline silicon perc (passivated emitterandrearcell) double-sided cells in the photovoltaic industry are optimized and upgraded by perc production line technology, and the rear aluminum back field is optimized from full printing to partial printing, and then the battery is completed through the sintering process and subsequent processes. Production. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J105/00C09J11/06C09J11/08C09J11/00H01B1/22
CPCC09J105/00C09J11/06C09J11/08C09J11/00H01B1/22C08L2205/025C08L2205/035C08L2203/206C08L5/00C08L91/00C08L1/286C08K5/41
Inventor 刘国民
Owner JIANGSU RIYU PHOTOVOTTAIC NEW MATERIAL TECH CO LTD
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