A kind of organic carrier for front silver paste and preparation method thereof

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

Active Publication Date: 2020-03-31
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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  • A kind of organic carrier for front silver paste and preparation method thereof
  • A kind of organic carrier 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, composed of the following raw materials in weight percentage: diethylene glycol octyl ether 32%, tripropylene glycol methyl ether 20.4%, butyl carbitol acetate 17%, and triglyceride modified Silicone resin 23.4%, rosin modified acrylic resin 1.2%, BYK-110 dispersant 3%, BYK-111 dispersant 3%, the preparation process of the organic carrier includes the following steps:

[0016] (1) Weigh the raw material of the organic carrier according to the above weight percentage, and then place it in a stainless steel heating kettle with a high-speed shear mixing head after the weighing;

[0017] (2) Seal the heating kettle, start the high-speed shear mixing head in the stainless steel heating kettle, and make the shear rate 20000r / min; at the same time, start the heating button, and heat the organic mixture to 90 at a heating rate of 2℃ / min. Within the range of ±5℃, and heat preservation for 2h;

[0018] (3) Turn off the high-speed shear mixi...

Embodiment 2

[0026] An organic carrier for positive silver paste, which is composed of the following raw materials in weight percentage: diethylene glycol octyl ether 30.7%, tripropylene glycol methyl ether 22.4%, butyl carbitol acetate 15%, and triglyceride modified The organic silicon resin is 24%, the rosin-modified acrylic resin is 1.5%, the BYK-110 dispersant is 3.2%, and the BYK-111 dispersant is 3.2%. The preparation process of the organic carrier 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 paste, and then print, sinter and test the terminal performance according to the application process of the paste. The final data As shown in the following table:

[0028] Homemade products Mainstream competitive product H Linear aspect ratio (height / width)0.550.47 Number of broken lines (p...

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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 cell sheet for sintering through a screen printing process. With the advancement and development of technology, battery cell manufacturers have put forward higher and higher requirements for the front silver paste. Not only do they require the linear aspect ratio of the front silver paste to be higher and higher, but also require the paste to have smooth printability (ie The paste satisfies the printing of fine lines with 28-30μm opening line width). These requirements are all achieved by relying on the organic carrier in the front silver paste....

Claims

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Application Information

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Patent Type & Authority Patents(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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