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Positive silver paste of crystalline silicon solar cell laminated printing and preparation method thereof

A solar cell and silver paste technology, which is applied in the field of solar cells, can solve the problems of serious EL grid breakage on silicon wafers and the inability to improve the efficiency of silicon wafer cells, and achieve the effects of improving light conversion efficiency, welding tension, and filling factor

Active Publication Date: 2017-04-26
北京市合众创能光电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of the market, the competition in the photovoltaic market is fierce. In order to achieve high efficiency and increase their market share, many battery factories try to print smoothly with a line width below 30um, but the EL grid of the silicon wafer is seriously broken. , and instead of improving the cell efficiency of silicon wafers, more defective products appear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The composition and weight percent of the first printing positive silver conductive paste in this embodiment: 78% of silver powder, 2% of glass powder, 8% of organic vehicle, 0.5% of BYK180, 0.3% of polyamide, and the rest are solvents, Glass powder is PbO-TeO 2 A series of glass powders with a particle size of 0.5-3 microns.

[0072] Preparation of organic vehicle 1: rosin 5%, ethyl cellulose 5%, polyamide 10%, butyl carbitol 40%, tributyl citrate 10%, dimethyl adipate 30%, at 80°C Dissolved for 2 hours at low temperature to obtain a uniform organic carrier;

[0073] Weigh 78% of silver powder, 2% of glass powder, 8% of organic carrier, 0.5% of BYK 180, 0.3% of polyamide according to the proportion of the above formula, and the rest is solvent. On-machine dispersion to below 10μm can be used to make crystalline silicon solar cell network-free front-side silver paste. The front silver paste of crystalline silicon solar cells is filtered through a 400-mesh sieve, and ...

Embodiment 2

[0079] The composition and percentage by weight of one printing positive silver conductive paste in the present embodiment: silver powder 80%, glass powder 2.6%, organic vehicle 10%, Tego 240 1%, polyester 1%, all the other are solvent, glass powder is PbO-TeO 2 A series of glass powders with a particle size of 0.5-3 microns.

[0080] Preparation of organic vehicle 1: rosin 5%, ethyl cellulose 3%, acrylic acid 2%, polyamide 10%, terpineol 30%, butyl carbitol 20%, tributyl citrate 10%, glutaric acid Dimethyl ester 20%, dissolved at 80°C for 2 hours to obtain a uniform organic carrier;

[0081] Weigh 80% of silver powder, 2.6% of glass powder, 10% of organic carrier, 1% of Tego 240, 1% of polyester and the rest as solvent according to the proportion of the above formula. Dispersed to less than 10 μm, it can be made into non-network front silver paste for crystalline silicon solar cells. The front silver paste of crystalline silicon solar cells is filtered through a 400-mesh s...

Embodiment 3

[0087] The composition and percentage by weight of one printing positive silver conductive paste in this embodiment: 78% of silver powder, 6.9% of glass powder, 12.8% of organic vehicle, 0.7% of BYK 180, 0.8% of polyoxymethylene, the rest is solvent, and glass powder is PbO-TeO 2 A series of glass powders with a particle size of 0.5-3 microns.

[0088] Preparation of organic vehicle 1: ethyl cellulose 3%, acrylic acid 2%, polyester 15%, butyl glycol ether 20%, DBE 25%, tributyl citrate 15%, ethylene glycol phenyl ether 20%, in Dissolve at 80°C for 2 hours to obtain a uniform organic carrier;

[0089] Weigh 78% of silver powder, 6.9% of glass powder, 12.8% of organic carrier, 0.7% of BYK 180, 0.8% of polyoxymethylene according to the proportion of the above formula, and the rest is solvent. Dispersed to less than 10 μm, it can be made into non-network front silver paste for crystalline silicon solar cells. The front silver paste of crystalline silicon solar cells is filtered...

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Abstract

The present invention relates to the technical field of solar cells and especially relates to a positive silver paste of crystalline silicon solar cell laminated printing and a preparation method thereof. A first positive silver paste is characterized for first positive silver printing and is formed by, by weight, 75% to 90% of silver powder, 1% to 8% of glass powder, 5 % to 15% of organic carriers 1, 0% to 1.5% of auxiliaries, 0.1% to 3% of adhesion promoters, and balance of solvent. A second positive silver paste is characterized for second positive silver printing and is formed by, by weight, 75% to 90% of silver powder, 1% to 8% of glass powder, 5 % to 15% of organic carriers 2, 0% to 1.5% of auxiliaries, 0.1% to 3% of pulling agent, and balance of solvent. The positive silver paste of crystalline silicon solar cell laminated printing comprises special first positive silver paste and second positive silver paste, the contact resistance of a cell can be reduced, the short circuit current and open circuit voltage are raised, a fill factor is raised, and thus the light conversion efficiency of the cell is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a combination of stacked and printed front silver pastes for crystalline silicon solar cells. Background technique [0002] Energy is the cornerstone of economic and social development. As an inexhaustible source of energy, solar energy is undoubtedly the best among many energy sources. Considering the conversion efficiency and material sources, silicon-based solar cells are still the key projects for the future development of solar cells. With the continuous development of crystalline silicon solar technology and the continuous improvement of the efficiency of crystalline silicon cells, the entire industry has higher and higher requirements for solar front silver paste. [0003] With the continuous development of the market, the competition in the photovoltaic market is fierce. In order to achieve high efficiency and increase their market share, many battery factories try t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
CPCH01B1/16H01B1/22H01B13/00H01L31/022425
Inventor 赵德平任中伟丁兴隆
Owner 北京市合众创能光电技术有限公司
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