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PERC crystalline silicon solar main grid positive silver paste for silk-screen printing and preparation method thereof

A technology of screen printing and silver paste, used in cable/conductor manufacturing, semiconductor device, final product manufacturing, etc., can solve the problems of EL blackening and darkening, and achieve the effect of reducing sintering energy consumption and low sintering temperature

Inactive Publication Date: 2018-05-25
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

Busbar front-side silver paste is printed on the current PERC battery, and the EL becomes black and dark after sintering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0025] Specific embodiment 1: the busbar front silver paste made by the following weight percentage, its weight percentage: spherical silver powder 70%, flaky silver powder 5%, nanometer silver powder 8%, organic vehicle 20%, glass powder 2%; Sintering Accelerator CaO0.3%, Fe 2 o 3 0.3%, BYK1100.2%, and the rest is terpineol. Weigh it according to the formula ratio, mix it evenly in a planetary mixer or other mixers, and then disperse it on a three-roller machine to a thickness below 10 μm to make a busbar front silver paste for crystalline silicon solar cells. The slurry is filtered through a 400-mesh sieve to obtain a very uniform solar cell busbar front silver paste. The viscosity of the slurry is 130 Pa.s (25°C). The sintering peak temperature of the prepared busbar front silver paste is 730-820° C., which reduces the contact resistivity and improves the photoelectric conversion efficiency.

specific Embodiment 2

[0026] Specific embodiment 2: the busbar positive silver paste made by the following weight percentages, its weight percentages: spherical silver powder 60%, flaky silver powder 5%, nano silver powder 5%, organic carrier 25%, glass powder 3%; Sintering Accelerator MgO0.5%, BYK1100.2%, the rest is terpineol. Weigh it according to the formula ratio, mix it evenly in a planetary mixer or other mixers, and then disperse it on a three-roller machine to a thickness below 10 μm to make a busbar front silver paste for crystalline silicon solar cells. The slurry is filtered through a 400-mesh sieve to obtain a very uniform silver paste on the back of the solar cell. The viscosity of the slurry was 109 Pa.s (25°C). The sintering peak temperature of the prepared busbar front silver paste is 730-820° C., which reduces the contact resistivity and improves the photoelectric conversion efficiency.

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Abstract

The invention relates to the technical field of electronic materials, in particular to PERC crystalline silicon solar main grid positive silver paste for silk-screen printing. The paste comprises, bymass, 60-80% of spherical silver powder, 5-40% of sheet-shaped silver powder, 5-20% of nanometer silver powder, 1-10% of glass powder, 20-50% of organic carrier and 0.2-3% of sintering accelerant. Byutilization of main grid positive silver paste, sintering temperature is low, energy consumption in sintering is reduced, sintering can be performed at the temperature of 730 DEG C-820 DEG C, and after the main grid positive silver paste is sintered, the main problems of EL darkening and blacking are solved.

Description

technical field [0001] The invention relates to the technical field of electronic materials, in particular to a screen-printed PERC crystalline silicon solar busbar front silver paste. Background technique [0002] The past three to five years have seen a rapid transformation of battery product technology in the photovoltaic manufacturing industry. Passivated emitter and partial back contact cells (PERC / PERL / PERT) have rapidly become a hot spot in recent years, and gradually began to erode the market share of traditional all-aluminum back field cells. [0003] The passivated emitter and back local contact cell (PERC) was first developed by the University of New South Wales. Due to the double-sided passivation of the cell, the back electrode adopts the form of local contact, which effectively reduces the surface recombination and reduces the warping and fracture of the battery. In addition, the back of the battery is polished to improve the absorption of long waves. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/02H01B1/22H01L31/0224H01L31/18H01B13/00
CPCH01B1/02H01B1/22H01B13/00H01L31/022425H01L31/18Y02E10/50Y02P70/50
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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