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Surface modification method for silver powder of solar front silver paste

A technology of surface modification and surface modifier, which is applied in the field of surface modification of silver paste and silver powder on the front side of solar energy, which can solve the problem of inability to guarantee the uniformity of silver powder surface coating, rare, silver paste printability and electrical properties Impact and other issues

Pending Publication Date: 2021-05-28
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are not many reports on the surface modification method of silver powder in the solar front silver paste, but in fact, the type, content and uniformity of the adsorbate on the surface of the silver powder have a great influence on the printability and electrical properties of the silver paste.
[0004] Japanese Dowa patent CN106573300A reports silver powder and its preparation method, and conductive paste. The silver powder of conductive paste with good leveling property is prepared by wet coating with organic matter containing carboxyl and hydroxyl groups. The wet coating cannot effectively coat easy Water-soluble surfactants such as triethanolamine
[0005] Japanese Dowa Patent CN106573304A reports silver powder and its manufacturing method. Dry stirring is used to coat aliphatic amide on the surface of silver powder. Dry stirring cannot guarantee the uniformity of silver powder surface coating.

Method used

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  • Surface modification method for silver powder of solar front silver paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Weigh 200 grams of spherical silver powder with a particle size of about 2 μm and place it in the reaction chamber of a rotary chemical vapor deposition device. Heat the chamber to 60°C and make the chamber rotate at 30 rpm. The reaction chamber is equipped with a The four stirring blades extending from the inner wall to the axis are used to stir the silver powder.

[0022] 2. Dissolve 1 gram of lauric acid (0.5% of the mass of silver powder) in 10 grams of alcohol and place it in the precursor raw material tank of the rotary chemical vapor deposition device; dissolve 1 gram of castor oil fatty acid (0.5% of the mass of silver powder) in 10 gram of alcohol, placed in the precursor raw material tank of the rotary chemical vapor deposition device; the carrier gas Ar was introduced into the two precursor raw material tanks, and the Ar flow rate was 50 sccm, and the switches of the two precursor raw material tanks were opened simultaneously to make the Acid and castor oi...

Embodiment 2

[0026] 1. Weigh 500 grams of spherical silver powder with a particle size of about 1 μm and place it in the reaction chamber of a rotary chemical vapor deposition device. Heat the chamber to 45°C and make the chamber rotate at 45 rpm. The reaction chamber is equipped with The four stirring blades extending from the inner wall to the axis are used to stir the silver powder.

[0027] 2. Dissolve 3 grams of lauric acid (0.6% of the mass of silver powder) in 10 grams of alcohol and place it in the precursor raw material tank of the rotary chemical vapor deposition device; dissolve 3 grams of triethanolamine (0.6% of the mass of silver powder) in 10 grams of In alcohol, place the precursor raw material tank of rotary chemical vapor deposition device; First pass carrier gas Ar in the precursor raw material tank of lauric acid, the Ar flow rate is 100sccm, open the precursor raw material tank of lauric acid, make lauric acid into the reaction chamber.

[0028] 3. Introduce the dilut...

Embodiment 3

[0032] 1. Weigh 500 grams of spherical silver powder with a particle size of about 4 μm and place it in the reaction chamber of a rotary chemical vapor deposition device. Heat the chamber to 80°C and make the chamber rotate at 60 rpm. The reaction chamber is equipped with a The four stirring blades extending from the inner wall to the axis are used to stir the silver powder.

[0033] 2. Dissolve 3 grams of oleic acid (0.6% of the mass of silver powder) in 10 grams of alcohol and place it in the precursor raw material tank of the rotary chemical vapor deposition device; dissolve 3 grams of cetylamine (0.6% of the mass of silver powder) in In 10 grams of alcohol, place the precursor raw material tank of the rotary chemical vapor deposition device; first pass the carrier gas Ar in the precursor raw material tank of oleic acid, and the Ar flow rate is 100 sccm, open the precursor raw material tank of oleic acid, Allow oleic acid to enter the reaction chamber.

[0034] 3. Introduc...

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Abstract

The invention discloses a surface modification method for silver powder of solar front silver paste. The method comprises the following process steps that the silver powder is put in a rotary chemical vapor deposition reaction cavity, surface modifiers such as organic acid, organic amine, inorganic iodine and the like are taken as reaction precursors, high-purity Ar is taken as current-carrying gas and diluent gas, and at a certain rotating speed, temperature, pressure intensity and time, uniform coating modification of the surface of the silver powder is realized. According to the surface modification method, through the rotary chemical vapor deposition technology, the surface of the modified silver powder is smooth, the modified silver powder has the characteristic of being uniformly coated with one or more functional groups, and the printing resolution or the electrical property of the front silver paste can be improved.

Description

technical field [0001] The invention belongs to the field of new material preparation and relates to a method for surface modification of metal materials, in particular to a method for surface modification of silver paste and silver powder on the front surface of solar energy. Background technique [0002] The front silver paste of solar cells is a homogeneous organic system formed by dispersing solid particles such as silver powder and glass powder in an organic carrier. Silver powder is the main conductive phase in the front silver paste, and its solid content is 80% to 90%. The specific surface area of ​​silver powder is large, and the particles are easily agglomerated. It is difficult for high-content silver powder to disperse and wet evenly in the organic phase, resulting If the paste is blocked, the printing resolution is low. Surface modification and coating of silver powder with surfactant can reduce the surface tension of the interface between organic carrier and s...

Claims

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Application Information

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IPC IPC(8): C23C16/44B22F1/02H01B1/22
CPCC23C16/4418H01B1/22B22F1/16
Inventor 朱佩佩袁松陈大鹏王灿魏冰歆
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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