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Composite microsphere and preparation method thereof

A composite microsphere and microsphere technology, applied in the field of solar cells, can solve the problems of limited amount of dissolved or deposited silver, reduced solar cell performance, low surface excess free energy, etc. rate, improve the effect of printing effect

Inactive Publication Date: 2019-12-20
SHANGHAI TRANSCOM ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The particle size of the silver particles contained in the conductive silver paste in the prior art is micron, because the particle size of the silver particles in the micron is relatively large and the surface excess free energy is low, thus resulting in the melting of the glass layer. The amount of silver dissolved or deposited is limited, which in turn leads to insufficient silver-silicon structure points, so the conductivity of the sintered silver wire is poor, thereby reducing the performance of the solar cell

Method used

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  • Composite microsphere and preparation method thereof
  • Composite microsphere and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] This embodiment provides a composite microsphere, which includes silver particles and polymer microspheres; the particle size of the silver particles is between 1 nm and 200 nm.

[0021] The silver particles are randomly implanted inside the polymer microspheres or adsorbed on the outer surface of the polymer microspheres.

Embodiment 2

[0024] The present embodiment provides a kind of preparation method of composite microsphere, comprises the steps:

[0025] S21 is used to prepare the step of the polymer microsphere that comprises vinyl macromer;

[0026] S22 for combining polymer microspheres with AgNO 3 The solutions are mixed to form the first mixed solution, thereby reacting to prepare polymer microspheres loaded with a large amount of silver ions;

[0027] S23 is a step of adding a reducing agent into the first mixed liquid to reduce silver ions to silver particles, thereby reacting to prepare composite microspheres containing silver particles.

[0028] Further, the reducing agent is potassium borohydride;

[0029] Further, the mass ratio of the silver particles to the polymer microspheres is between 1:100 and 1:1;

[0030] Further, in the preparation method provided in this example, during the preparation process, by adjusting the added AgNO 3 concentration to adjust the particle size of the silver ...

Embodiment 3

[0035] The present embodiment provides a kind of preparation method of composite microsphere, comprises the steps:

[0036] S31 is a step for preparing polymer microspheres comprising vinyl macromers;

[0037] S32 is used to disperse 10g dry polymer microspheres in water and add 1.575g AgNO 3 thereby forming the step of the second mixture;

[0038] S33 is used to put the second mixture in N 2 The step of fully stirring for 12 hours in a protected environment to fully disperse and adsorb the silver ions in the polymer microspheres;

[0039]S34 is a step for mixing 0.1 mol / L KOH aqueous solution with the second mixture so as to adjust the pH value of the second mixture to between 8 and 9 and continue stirring for 0.5 hours to 1 hour;

[0040] S35 is a step for adding 100 mL of D-glucose solution dropwise to the second mixture, stirring for 6-12 hours to make it fully react, thereby obtaining the second mixture;

[0041] S36 is a step of transferring the second mixture to a m...

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Abstract

The invention aims to provide a composite microsphere and a preparation method thereof. The composite microsphere comprises silver microparticles and polymer microspheres, the weight percentage of thesilver microparticles to the polymer microspheres is (1 to 100)-(1 to1); and the particle diameter of the silver microparticles is between 1 nanometer and 200 nanometers. The composite microsphere can be directly added to conductive silver paste, and the relatively good rheology of the silver paste is maintained on the basis of improving the conductivity of the silver paste. The composite microsphere can be applied to solar crystalline silicon conductive silver paste, low-temperature silver paste and conductive glue.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a composite microsphere containing nano-silver and a preparation method thereof, which can be applied to solar crystalline silicon conductive silver paste, low-temperature silver paste and conductive adhesive. Background technique [0002] The metal wires of the electrodes of crystalline silicon solar cells are usually silver wires, which are formed by sintering conductive silver paste. layer on the silicon wafer, and then sintered to form the conductive silver wire. The conductivity of conductive silver wire is an important technical indicator that determines the performance of solar cells, and the conductivity of conductive silver wire has a great correlation with the composition, rheology, printing process, and sintering process of conductive silver paste. Generally, the existing silicon wafer used for solar cells on the market has a thickness of about 180 microns. In ord...

Claims

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Application Information

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IPC IPC(8): B01J13/02C08F222/14C08F220/14C08F220/18C08F220/54C08F220/20C08F222/38C08F20/56C08F20/54C08F26/06
CPCB01J13/02C08F20/54C08F20/56C08F26/06C08F220/54C08F222/10C08F220/20C08F222/385
Inventor 刘姗姗杨建平闫方存龚健花
Owner SHANGHAI TRANSCOM ELECTRONICS TECH
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