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Organic carrier used for front silver paste and preparation method thereof

A technology of organic carrier and silver paste, which is applied in the direction of semiconductor devices, conductive materials dispersed in non-conductive inorganic materials, electrical components, etc., can solve the problems of complex system, poor linear aspect ratio, poor printing characteristics, etc., to achieve The composition is simple, the adhesion is improved, and the effect of improving efficiency

Active Publication Date: 2019-02-26
上海银浆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the pastes currently on the market is that the pastes with excellent linear aspect ratio generally have poor printing characteristics.
However, for pastes with very smooth printing characteristics, the line aspect ratio is generally poor
It is difficult to have a paste that can achieve both, with both excellent line shape and good printing characteristics; in addition, most of the organic vehicles used in front-side silver pastes currently introduce more components, and the system is more complicated

Method used

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  • Organic carrier used for front silver paste and preparation method thereof
  • Organic carrier used for front silver paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] An organic carrier for positive silver paste, which is composed of the following raw materials in weight percentage: 32% of diethylene glycol octyl ether, 20.4% of tripropylene glycol methyl ether, 17% of butyl carbitol acetate, triglyceride modified Silicone resin 23.4%, rosin-modified acrylic resin 1.2%, dispersant (BYK-110) 3%, dispersant (BYK-111) 3%, the preparation process of this organic vehicle comprises the following steps:

[0016] (1) The raw material of the organic carrier is weighed according to the above weight percentage, and then placed in a stainless steel heating kettle with a high-speed shear stirring head after weighing;

[0017] (2) Seal the heating kettle, start the high-speed shear stirring head in the stainless steel heating kettle, make the shear rate be 20000r / min; start the heating button at the same time, according to the heating rate of 2 ℃ / min, the organic mixture is heated to 90 Within the range of ±5°C, keep warm for 2 hours;

[0018] (3...

Embodiment 2

[0026] An organic vehicle for front silver paste, which is composed of the following raw materials in weight percentage: 30.7% of diethylene glycol octyl ether, 22.4% of tripropylene glycol methyl ether, 15% of butyl carbitol acetate, triglyceride modified Silicone resin 24%, rosin-modified acrylic resin 1.5%, dispersant (BYK-110) 3.2%, dispersant (BYK-111) 3.2%, the preparation process of the organic vehicle is the same as that of Example 1.

[0027] The finished carrier will be prepared according to the preparation process of the organic carrier, and then 8.3% organic carrier, 2.1% glass powder, and 89.6% silver powder will be used to prepare the finished slurry, and the final data will be printed, sintered and tested according to the application process of the slurry. As shown in the table below:

[0028]

[0029] It can be seen from the data that the linear aspect ratio of the self-made product, the number of broken wires in a single chip, and the efficiency of t...

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Abstract

The invention discloses an organic carrier used for a front silver paste. The organic carrier is characterized by being composed of the following raw materials by weight: 25% to 35% of diethylene glycol octyl ether, 15% to 27%vof tripropylene glycol methyl ether, 10% to 18% of butyl group carbitol acetate, 20% to 25% of triglyceride-modified silicone resin, 0.3% to 2% of rosin-modified acrylic resin, 1%~ 4% of dispersant (BYK-110), and 1% to 4% of dispersant (BYK-111). According to the invention, the triglyceride-modified silicone resin is introduced in the organic carrier prepared by the invention, so the depth-width ratio of the line type is ensured; the efficiency of a cell sheet is improved, and the organic carrier has excellent printing characteristics; by introducing a small amount of rosin-modified acrylic resin, the adhesion of the silver film layer and the silicon substrate after the silver paste is dried is ensured; falling-off phenomena will not occur; the solderability of the silver film layer after sintering with the soldering ribbon is promoted; and improvement of the adhesion is ensured.

Description

technical field [0001] The invention relates to the field of new materials, in particular to an organic carrier for front silver paste and a preparation method thereof. Background technique [0002] The front silver paste for crystalline silicon cells is mainly made of organic carrier, glass powder and silver powder after being evenly stirred and ground by a three-roll mill, and then the silver paste is printed on the crystalline silicon cells by screen printing process for sintering. With the advancement and development of technology, cell manufacturers have put forward higher and higher requirements for the front silver paste, which not only require the line aspect ratio of the front silver paste to be higher and higher, but also require the paste to have smooth printability (i.e. The paste satisfies the printing of fine line 28-30μm opening line width). These requirements are all achieved by relying on the organic vehicle in the front silver paste. The problem with past...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224C08L83/04C08L33/00
CPCC08L83/04H01B1/22H01L31/022425C08L33/00
Inventor 王岩陈小龙乔亮赵佳琦
Owner 上海银浆科技有限公司
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