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Conductive silver paste for the front side of crystalline silicon solar cells

A solar cell and conductive silver paste technology, applied in the field of solar energy, can solve the problems of affecting the conversion efficiency of the cell, low short-circuit current of the cell, and easy breakdown of the pn junction, etc., to achieve the improvement of photoelectric conversion efficiency, increase the conversion efficiency, and increase the short-circuit current Effect

Active Publication Date: 2017-09-26
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 the front side of crystalline silicon solar cells

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 a conductive silver paste for the front surface of a crystalline silicon solar cell. The components and weight percentages of the conductive silver paste are as follows: silver powder 75-90%; glass binder 0.5-2%; organic binder 10% ~25%; inorganic conductive additive 0.01~2%; wherein, the inorganic conductive additive is an inorganic compound containing antimony; the average particle size of the silver powder is 0.2~2 microns, and the tap density is greater than 4.8g / cc. In the present invention, by adding an appropriate amount of antimony-containing inorganic conductive additives and selecting glass powder, the antimony-containing inorganic conductive additives interact with the selected glass powder during sintering at high temperature, which can enhance the electrical conductivity of the glass and effectively reduce the battery life. The series resistance can improve the long-wave response of the electrode and the short-circuit current of the battery, thereby improving the conversion efficiency of the battery.

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 Patents(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