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Method for preparing silver paste used for back electrode of photovoltaic cell

A photovoltaic cell and back electrode technology, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, can solve problems such as limited effects, reduce production losses, improve slurry fineness, and reduce three The effect of roller grinding times

Inactive Publication Date: 2012-02-22
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, in the process of preparing silver paste, high-speed dispersion and three-roll grinding are mainly used to improve the dispersion of silver powder in the system, but fundamentally, the above-mentioned measures are still mechanical, and the effect is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) An organic system for preparing silver paste, that is, dissolving ethyl cellulose in oleic acid at a temperature of 50°C, wherein the mass ratio of thickener ethyl cellulose and slurry solvent oleic acid in the slurry system is 2 % and 20%.

[0021] (2) adding diluting solvent methanol, its quality is 5 times of slurry organic system;

[0022] (3) add superfine silver powder (particle diameter is 1 micron, the polyvinylpyrrolidone of surface wrapping 1%) and glass powder, their mass ratio in slurry system is 75% and 3%; Utilize sand mill (rotating speed is 1000-2000rmp) to disperse the whole system at high speed while heating, and evaporate the dilution solvent at a temperature of 60°C;

[0023] (4) Grinding the slurry system with a three-roll grinder to adjust the fineness to 8 microns to prepare the silver paste for the back electrode of the photovoltaic cell.

Embodiment 2

[0025] (1) The organic system for preparing silver paste, that is, the thickener polyethylene glycol is dissolved in the slurry solvent xylene at a temperature of 70 ° C, wherein the thickener polyethylene glycol and the slurry solvent xylene are in the slurry system The mass ratios are 3% and 25%.

[0026] (2) Add dilute solvent acetone, which has good compatibility with the polymer protective agent wrapped on the surface of silver powder and is volatile, and its quality is 3 times that of the slurry organic system;

[0027] (3) add ultra-fine silver powder (particle diameter is 1.5 micron, the Span-80 of surface wrapping 0.9%) and glass powder, and their mass ratio in slurry system is 70% and 2%; Utilize sand mill (rotating speed 1000-2000rmp) to disperse the whole system at a high speed while heating, and evaporate the dilution solvent at a temperature of 50°C;

[0028] (4) Grinding the slurry system with a three-roll mill to adjust the fineness to 6 microns to prepare the...

Embodiment 3

[0030] (1) An organic system for preparing silver paste, that is, the thickener hydrogenated castor oil is dissolved in the slurry solvent terpineol at a temperature of 60°C, wherein the thickener hydrogenated castor oil and the slurry solvent terpineol are in the slurry system The mass ratio in is 2% and 30%.

[0031] (2) Add diluting solvent ethanol, which has good compatibility with the polymer protective agent wrapped on the surface of silver powder and is volatile, and its quality is 8 times that of the slurry organic system;

[0032] (3) Add ultrafine silver powder (the particle diameter is 0.8 micron, the fatty acid of 1.2% on the surface) and glass powder, and their mass ratio in slurry system is 65% and 3%; Utilize sand mill (rotating speed is 1000- 2000rmp) disperse the whole system at high speed while heating, and evaporate the dilution solvent at a temperature of 70°C;

[0033] (4) Grinding the slurry system with a three-roll mill to adjust the fineness to 7 micro...

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Abstract

The invention discloses a method for preparing silver paste used for a back electrode of a photovoltaic cell. The method comprises the following steps of mixing a pasty solvent, a thickening agent and a diluting solvent, adding superfine silver powder and glass powder in the mixture, dispersing at a high speed in a sand mill, heating synchronously to evaporate the diluting solvent, thereby betterpromoting dispersion of the superfine silver at a molecular level, and finally grinding by using a three-roll grinder so as to prepare the silver paste for the back electrode of the photovoltaic cell. The silver paste used for the back electrode of the photovoltaic cell prepared by the method provided by the invention has good dispersivity, the fineness of the prepared paste material is less than8 microns, so that the method is suitable for being used in the preparation of photovoltaic cells in large scale.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic cells, in particular to a method for preparing silver paste for back electrodes of photovoltaic cells. Background technique [0002] With the improvement of green energy technology, the photovoltaic cell industry is advancing by leaps and bounds, ushering in unprecedented development. A photovoltaic cell is a semiconductor device that generates electrons under the excitation of sunlight, and collects electrons through grid lines and electrodes, thereby realizing the conversion of solar energy into electrical energy. The silver electrode on the back of the photovoltaic cell is made of silver paste through high-speed and high-precision screen printing, low-temperature drying and high-temperature sintering. [0003] The silver paste for the back electrode of photovoltaic cells is mainly composed of silver powder, glass powder and organic system, which is formed by dispersing silver powder and g...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B1/22H01L31/0224
Inventor 琚伟
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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