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Conductive silver paste for frontage of crystalline silicon solar cell

A technology of solar cells and conductive silver paste, applied in the field of solar energy, can solve problems such as low short-circuit current of cells, affect cell conversion efficiency, and easy breakdown of pn junctions, etc., to improve photoelectric conversion efficiency, reduce series resistance, and improve short circuit The effect of current

Active Publication Date: 2015-04-29
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the microcrystallization of the glass phase, the supersaturation of silver in the glass phase increases, so that the precipitated silver particles are too large, and it is easy to break down the pn junction, resulting in a low short-circuit current of the battery after sintering, which affects the battery life. conversion efficiency

Method used

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  • Conductive silver paste for frontage of crystalline silicon solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of organic binder

[0029] Weigh 3.3g ethyl cellulose, 1.3g acrylic resin, add 5g terpineol, 6.7g butyl carbitol acetate, 6.7g diethylene glycol butyl ether, mix and heat to 60-90°C, dissolve, Obtain the organic binder and set aside.

[0030] (2) Preparation of conductive silver paste

[0031] Weigh 0.01g of antimony additive InSb, 2.0g of B 2 o 3 -SiO 2 -Bi 2 o 3 The lead-free glass binder of the system (softening temperature is 650°C), mixed with 23 grams of the above-mentioned organic binder, and then added 75g of silver powder (particle size is 0.2 microns, tap density is 5.5g / cc), After mixing, stirring and grinding, the required conductive silver paste for the front side of the solar cell is obtained.

Embodiment 2

[0033] (1) Preparation of organic binder

[0034] Weigh 0.75g of rosin, add 6.0g of dibutyl phthalate and 8.5g of terpineol, mix and heat to 60-90°C, dissolve to obtain an organic binder, and set aside.

[0035] (2) Preparation of conductive silver paste

[0036] Weigh 2.0g of antimony additive Sb 2 Te 3 , 2.0g of B 2 o 3 --Bi 2 o 3 --PbO system lead-containing glass binder (softening temperature is 450°C), after mixing with 15 grams of the above-mentioned organic binder, add 81g of silver powder (particle size is 1.0 micron, tap density is 4.9g / cc ) mixed, stirred and then ground to obtain the desired conductive silver paste for the front side of the solar cell.

Embodiment 3

[0038] (1) Preparation of organic binder

[0039] Weigh 1.05g of nitrocellulose, add 3.15g of butyl carbitol acetate and 2.8g of diethylene glycol butyl ether, mix and heat to 60-90°C, dissolve to obtain an organic binder, and set aside.

[0040] (2) Preparation of conductive silver paste

[0041] Weigh 1.0g of YSb, 2.0g of Bi 2 o 3 - SiO 2 - Lead-free glass binder of ZnO system (softening temperature is 500°C), after mixing with 7g of the above organic binder, add 90g of silver powder (particle size: 2.0 microns, tap density: 5.2g / cc) and mix , stirred and then ground to obtain the required conductive silver paste for the front side of the solar cell.

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Abstract

The invention relates to conductive silver paste for the frontage of a crystalline silicon solar cell. The conductive silver paste comprises the following components in percentage by weight: 75-90% of aluminium powder, 0.5-2% of a glass binder, 10-25% of an organic binder and 0.01-2% of an inorganic conductive assistant, wherein the inorganic conductive assistant is an antimony-containing inorganic compound; the mean grain size of the aluminium powder is 0.2-2 microns, and the tap density of the aluminium powder is 4.8g / cc. According to the invention, a proper amount of antimony-containing inorganic conductive assistant is added, selected glass powder is adopted, and the antimony-containing inorganic conductive assistant and the selected glass powder interact with each other under the condition of high-temperature sintering, so that the conductive performance of glass is enhanced, the series resistance of a battery is effectively reduced, the long wave response of an electrode can be improved, and the short-circuit current of the battery is improved; therefore, the battery transfer efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a conductive silver paste for the front surface of a crystalline silicon solar cell. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. Under the condition of light, a photogenerated current is generated inside the solar cell, and the electrical energy can be directly output through the electrodes. In order to output the maximum amount of electric energy, electrode fabrication is a very important link. Silicon solar cell electrodes include front silver electrodes, back silver electrodes, and aluminum electrodes. The front silver electrodes have a great influence on the conversion efficiency of silicon solar cells. The performance of the front silver paste directly determines the performance of the front electrodes of solar cells. A key material in the manufacture of crystalline silicon solar cells. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22
Inventor 任明淑刘子英何红伟马亚男徐建伟王小记柳青赵双林
Owner 乐凯胶片股份有限公司