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

A technology of solar cells and surface modification, applied in conductive materials, circuits, photovoltaic power generation, etc. dispersed in non-conductive inorganic materials, can solve the problem that the hydrophobic properties, dispersibility and fluidity of silver powder cannot be improved at the same time, and the silver powder cannot be improved at the same time. Tap density, reduce contact resistance open circuit voltage and other issues, to achieve the effect of increasing photoelectric conversion efficiency, improving hydrodynamic performance, improving battery string resistance and open voltage

Inactive Publication Date: 2017-10-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the fact that the existing silver powder surface modification treatment methods cannot improve the hydrophobicity, dispersibility and fluidity of the silver powder at the same time, prevent the problem of easy agglomeration during storage, and cannot simultaneously improve the tap density of the silver powder, reduce the contact resistance, and increase the open circuit voltage , and then increase the deficiency of photoelectric conversion efficiency; the present invention adopts organic fatty acid or organic fatty acid salt, silane coupling agent to do surface treatment agent to carry out the surface modification of silver powder, provides a kind of surface modification of silver powder for solar cell positive silver paste sexual method

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1. Prepare surface treatment solution A: Weigh 1g of oleic acid and dissolve it in 100g of acetone; Surface treatment solution B: Stir evenly with 80g of ethanol and 20g of deionized water, add 1g of KH550 dropwise while stirring, KH550 is completely hydrolyzed; Mix treatment solution A and surface treatment solution B evenly, add 100g of 2μm silver powder, stir for 20min; settle completely, remove the supernatant, wash twice with absolute ethanol, dry in a drying oven at 80°C for 30min, and pass through a 100-mesh sieve .

Embodiment 2

[0033]Embodiment 2, prepare surface treatment solution A: Weigh 1g stearic acid and dissolve in 100g ethanol; Surface treatment solution B: Stir 80g ethanol and 20g deionized water evenly, add 1g KH550 dropwise while stirring, KH550 is completely hydrolyzed; Mix surface treatment solution A and surface treatment solution B evenly, add 100g of 2μm silver powder, stir for 20 minutes; settle completely, remove supernatant, wash with absolute ethanol twice, dry in a drying oven at 80°C for 30 minutes, and pass through a 100-mesh sieve network.

Embodiment 3

[0034] Example 3, preparation of surface treatment solution A: Weigh 1g of zinc stearate and dissolve in 100g of benzene; surface treatment solution B: 80g of ethanol and 20g of deionized water are stirred evenly, and 1g of KH550 is added dropwise while stirring, and KH550 is completely hydrolyzed; Mix the surface treatment solution A and the surface treatment solution B evenly, add 100g of 2μm silver powder, stir for 20min; settle completely, remove the supernatant, wash twice with absolute ethanol, dry in a drying oven at 80°C for 30min, and pass through 100 mesh sieve.

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Abstract

The invention relates to a surface modification method of silver powder for solar battery front silver paste. The surface modification method comprises the steps that the silver powder is added to a mixed solution of a silane coupling agent solution and an organic fatty acid or organic fatty acid salt solution, then mixing is carried out for 10-40 mins, and sedimentation, washing, drying and screening are carried out, so that the treatment is completed. The silver powder after the surface modification is high in storage stability, good in dispersity, high in tap density and good in liquidity and is not prone to agglomerating; the wettability and the compatibility with an organic carrier of the silver powder are improved, and the silver powder is thus dispersed uniformly in paste; the hydrodynamics performance and the liquidity of the paste are improved; the compactness after sintering is improved; the series resistance is reduced and the open-circuit voltage is raised, so that the photoelectric conversion efficiency is improved; and the surface modification method is simple in technology, easy to implement and low in cost.

Description

technical field [0001] The invention relates to the field of front silver paste of solar cells, in particular to a surface modification treatment method for metal silver powder used in making the paste. Background technique [0002] With the depletion of non-renewable resources such as oil and coal, and the enhancement of people's awareness of environmental protection, the development of new energy has attracted more and more attention, especially the development and utilization of solar energy has become a hot spot. Front silver paste plays a vital role in solar cells, and silver powder plays a leading role in front silver paste. Silver powder is the conductive phase of the front silver paste, and the mass ratio in the silver paste can reach 80-92%. It has a great influence on the rheological properties and printability of the paste, and plays a decisive role in the photoelectric conversion efficiency of the solar cell. . As the market demands higher and higher photoelect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00H01B1/22H01L31/0224
CPCH01L31/022425H01B1/22B22F1/145Y02E10/50
Inventor 陈波陈代荣许文艳焦秀玲马跃跃郭凯
Owner SHANDONG UNIV
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