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Glass-powder-free crystalline silicon solar battery aluminum paste and preparation method thereof

A technology for solar cells and crystalline silicon, which is used in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Narrowing and other problems, to achieve the effect of low square resistance, short dissolution time and stable quality

Active Publication Date: 2012-10-03
JIANGSU HOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass powder is mainly made of several metal oxides melted at high temperature, crushed and ground. The system and reaction process are very complicated, and the quality is difficult to be effectively controlled. The difference between batches makes the back field tension fluctuate. Low, the density of the back field is also affected; moreover, glass powder is an inorganic insulating material, and the glass film formed by melting during the sintering process also has a certain influence on the resistivity of the aluminum back layer, which must be sintered within a small temperature range In order to achieve a better effect, this makes the sintering window of the aluminum paste greatly narrowed, and the matching with front-side silver co-firing becomes poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Aluminum powder: The particle size of the aluminum powder used is 4.8 μm for D50, 1.2 μm for D10, and 13.5 μm for D90.

[0029] Organic binder: 2 parts by mass of alkyd resin, 35 parts of terpineol, 35 parts of butyl carbitol, 20 parts of trimethylpentanediol isobutyrate, 2 parts of oleic acid, 2.5 parts of pump oil , mixed and added to the reaction kettle and heated to 80-100 ° C, then stirred and added 3.5 parts of ethyl cellulose, dissolved and filtered to obtain a clear and transparent organic adhesive.

[0030] Aluminum paste: take 74 parts by mass of aluminum powder, 24 parts of the above organic binder, 1 part of zinc caprate, 0.5 part of wetting and dispersing agent (BYK-108), 0.5 part of defoamer (KS-66), use Stir with a high-speed mixer (1000r / min) for 30min, the fineness of the slurry reaches 40-50μm, grind with a three-roll mill, control the viscosity of the slurry to 30000-45000 mPa·s at 25°C, the fineness of the slurry is <20μm, and the production cost In...

Embodiment 2

[0033] Aluminum powder: The particle size of the aluminum powder used is 5.6 μm for D50, 1.4 μm for D10, and 14.7 μm for D90.

[0034] Organic binder: 2 parts by mass of alkyd resin, 30 parts of terpineol, 30 parts of butyl carbitol, 30 parts of trimethylpentanediol isobutyrate, 1.5 parts of oleic acid, 2.5 parts of pump oil , mixed and added to the reaction kettle and heated to 80-100 ° C, then stirred and added 4.0 parts of ethyl cellulose, dissolved and filtered to obtain a clear and transparent organic adhesive.

[0035] Aluminum paste: 76 parts by mass of aluminum powder, 22 parts of the above-mentioned organic binder, 0.8 part of zinc naphthenate, 0.6 part of wetting and dispersing agent (BYK-108), 0.6 part of defoamer (KS-66), Stir with a high-speed mixer (1000r / min) for 30min, the fineness of the slurry reaches 40-50μm, grind with a three-roll mill, control the viscosity of the slurry to 30000-45000 mPa·s at 25°C, and the fineness of the slurry is <20μm, and make The ...

Embodiment 3

[0038] Aluminum powder: the particle size specification of the aluminum powder used is the same as in Example 1.

[0039] Organic binder: 3 parts by mass of alkyd resin, 35 parts of terpineol, 30 parts of butyl carbitol, 25 parts of trimethylpentanediol isobutyrate, 1 part of oleic acid, 2.5 parts of pump oil , mixed and added to the reaction kettle and heated to 80-100 ° C, then stirred and added 3.5 parts of ethyl cellulose, dissolved and filtered to obtain a clear and transparent organic adhesive.

[0040] Aluminum paste: 75 parts by mass of aluminum powder, 23 parts of the above-mentioned organic binder, 0.8 part of zinc citrate, 0.7 part of wetting and dispersing agent (BYK-108), 0.5 part of defoamer (KS-66). Stir with a high-speed mixer (1000r / min) for 30min, the fineness of the slurry reaches 40-50μm, grind with a three-roll mill, control the viscosity of the slurry to 30000-45000 mPa·s at 25°C, the fineness of the slurry is <20μm, and the production cost Invented glas...

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PUM

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Abstract

The invention relates to a glass-powder-free crystalline silicon solar battery aluminum paste and a preparation method thereof. The aluminum paste consists of the following raw materials by mass portions: 70-80 portions of aluminum powder, 18-28 portions of organic bond, 0.5-1.5 portions of adhesive force additive and 0.5-1.5 portions of adjuvant, wherein the adhesive force additive is zinc decanoate, zinc naphthenate, zinc citrate or zirconium citrate. After the aluminum paste is screen-printed and dried, the aluminum paste can be sintered within a wider temperature range, a back surface field can be in good ohmic contact with a silicon wafer, the adhesive force is good, the conversion efficiency of cells is high and the warping degree of the cells is reduced.

Description

technical field [0001] The invention relates to a crystalline silicon solar cell aluminum conductive paste and a preparation method thereof. Background technique [0002] With the development of human history, people's demand for energy is also increasing. However, with the continuous deepening of traditional petrochemical energy mining, these energy sources will eventually be exhausted one day. In addition, the environmental pollution caused by traditional petrochemical energy is becoming more and more serious, and the world is experiencing a series of consequences brought about by the greenhouse gas effect, which makes people have a soft spot for clean energy. Under this background, the solar photovoltaic power generation industry has developed rapidly. In the past ten years, the average annual growth rate of the photovoltaic industry represented by crystalline silicon solar cells has exceeded 30, becoming one of the main clean energy development directions in the world. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01B1/22H01B13/00
Inventor 杨贵忠任进福许士燕
Owner JIANGSU HOYI TECH
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