Preparation method of spherical silver powder for photovoltaic positive silver electrode

A silver powder and photovoltaic technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of reduced sintering activity of silver particles, difficulty in forming silver-silicon contacts, and increased electrode wire resistance, etc., to achieve stable electrical performance, high tap density, High dispersion effect

Inactive Publication Date: 2018-04-20
GRIKIN ADVANCED MATERIALS
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Problems solved by technology

If the particle size of the silver powder is too small, it will start to melt at the initial stage of sintering, which is not conducive to the corrosion of the SiN layer by the liquefied binder phase through the capillary flow between particles, making it difficult to form an ideal silver-silicon contact; if the particle size of the silver powder is too large, the silver particles will sinter The activity decreases and the wire resistance of the electrode increases

Method used

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  • Preparation method of spherical silver powder for photovoltaic positive silver electrode
  • Preparation method of spherical silver powder for photovoltaic positive silver electrode

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Embodiment

[0026] A kind of spherical silver powder (100g), its production process is as follows:

[0027] 1. Preparation of silver-containing mixed solution: take 150 grams of methylcellulose, add appropriate amount of water, and dissolve it completely; weigh 158 grams of silver nitrate and add 200 ml of water, dissolve it completely, and use ammonia water to prepare the silver nitrate solution into silver ammonia solution. Mix the above two solutions, add water to make up to 5L.

[0028] 2. Weigh 200 grams of organic reducing agent ascorbic acid, add 2 L of water to dissolve, and set aside.

[0029] 3. Reduction: Place the silver-containing mixed solution in an ultrasonic water bath, control the temperature of the heating solution within the range of 40-60°C, pour the reducing agent solution into the silver-containing mixed solution at one time to reduce Ag+, and wait until the upper mixed solution becomes clear , Ag+ reduction is complete, and spherical silver powder is prepared.

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Abstract

The invention relates to a preparation method of spherical silver powder for a photovoltaic positive silver electrode. The spherical silver powder prepared through the method is high in dispersity, high in sphericity and high in tap density; the particle size ranges from 1-3 microns, and the spherical silver powder is subjected to narrow particle size distribution. The method comprises the steps of adding a thickening agent and a dispersing agent to a prepared silver-ammonia solution; controlling system temperature and adding a weak reductant to an ultrasonic water bath kettle; and reducing toobtain the high-dispersity and high-density spherical silver powder. The silver powder is used for preparing photovoltaic positive silver electrode sizing, and uniform silver-silicon contact is realized after sintering; and meanwhile, the silver powder is high in photoelectric conversion efficiency and stable electricity performance.

Description

technical field [0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a method for preparing spherical silver powder for photovoltaic positive silver electrodes. Background technique [0002] Solar conductive silver paste is the main raw material for manufacturing solar cells, and its preparation technology is the key to high-efficiency and low-cost solar cells. In recent years, with the development of my country's photovoltaic industry, the pace of development of conductive silver paste has been accelerating. Through the improvement of paste technology, the purity of silicon materials, the optimization of the grid line and the configuration of the bottom plate, the efficiency of solar cell paste has gradually increased from the initial 12% to 13%, and there will be an increase of 0.5% to 1% every year after 2002. , At present, the efficiency of monocrystalline silicon cells has reached more than 18%. Generally speaking, the tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F2009/245B22F1/065
Inventor 关俊卿滕海涛陈峤李治宇陈斐吴聪罗瑶吕保国吴松
Owner GRIKIN ADVANCED MATERIALS
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