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Solar cell conductive paste and preparation method thereof

A technology for solar cells and conductive paste, applied in the field of solar cell materials, can solve the problems of poor dispersion performance of conductive metal powder and glass powder, affecting the service life of solar cells, affecting the performance of conductive silver paste, etc. The effect of improving conductivity and lowering sintering temperature

Active Publication Date: 2019-12-20
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersibility of the conductive metal powder and glass powder in this sintered conductive paste is poor, and agglomeration or sedimentation is prone to occur, which affects the performance of the conductive silver paste. In addition, the sintering temperature used for the conductive paste is high, and the adhesion performance Insufficient, seriously affecting the service life of solar cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a solar cell conductive paste, which includes the following parts by mass of raw materials: 30 parts of resin matrix, 40 parts of conductive agent, 4 parts of glass powder, and 1 part of auxiliary agent;

[0023] Wherein, the glass powder has a particle size of less than 200 nanometers and a sphericity of less than 0.5, and the conductive agent has a particle size of less than 100 nm and a sphericity of less than 0.5.

[0024] Preferably, in terms of parts by mass, the resin matrix includes 70 parts of solvent and 30 parts of resin.

[0025] Preferably, the resin is polyurethane, the solvent is composed of a first solvent, a second solvent, and a third solvent in a mass ratio, and the boiling point of the first solvent T1>the second solvent T2>the third solvent T3: The mass ratio of the first solvent, the second solvent and the third solvent is 1.5:0.8:0.3.

[0026] Preferably, the first solvent is ethyl acetate, the second solvent is propylene glycol m...

Embodiment 2

[0032] This embodiment provides a solar cell conductive paste, including the following parts by mass of raw materials: 50 parts of resin matrix, 60 parts of conductive agent, 10 parts of glass powder, and 6 parts of auxiliary agent;

[0033] Wherein, the glass powder has a particle size of less than 200 nanometers and a sphericity of less than 0.5, and the conductive agent has a particle size of less than 100 nm and a sphericity of less than 0.5.

[0034] Preferably, in terms of parts by mass, the resin matrix includes 80 parts of solvent and 20 parts of resin.

[0035] Preferably, the resin is polyacrylate, the solvent is composed of a first solvent, a second solvent, and a third solvent in a mass ratio, and the boiling point of the first solvent T1>the second solvent T2>the first solvent Three solvent T3; the mass ratio of the first solvent, the second solvent and the third solvent is 2:1.2:0.5.

[0036] Preferably, the first solvent is ethanol; the second solvent is hexylamine; and...

Embodiment 3

[0045] This embodiment provides a solar cell conductive paste, including the following parts by mass of raw materials: 35 parts of resin matrix, 55 parts of conductive agent, 6 parts of glass powder, and 5 parts of auxiliary agent;

[0046] Wherein, the glass powder has a particle size of less than 200 nanometers and a sphericity of less than 0.5, and the conductive agent has a particle size of less than 100 nm and a sphericity of less than 0.5.

[0047] Preferably, in terms of parts by mass, the resin matrix includes 75 parts of solvent and 25 parts of resin.

[0048] Preferably, the resin is an epoxy resin, the solvent is composed of a first solvent, a second solvent, and a third solvent in a mass ratio, and the boiling point of the first solvent T1>the second solvent T2>the first solvent Three solvent T3; the mass ratio of the first solvent, the second solvent and the third solvent is 1.8:1:0.4.

[0049] Preferably, the first solvent is isopropanol; the second solvent is triethanol...

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Abstract

The invention provides solar cell conductive paste. The nanoscale glass powder and the conductive powder are adopted, the sintering temperature can be effectively reduced, the method can be conveniently applied to occasions with low sintering temperature, such as back passivation solar cells (PERC), moreover, the sphericity degree of the glass powder and the conductive powder is smaller than 0.5 to form the pinning effect and the bridging effect, so not only the glass powder and the conductive powder are dispersed more uniformly in a resin matrix, the adhesion capability is enhanced, but alsoconductivity is improved, and conversion efficiency of a solar cell is enhanced, furthermore, the resin matrix adopts three kinds of solvents with different boiling points, so uniform volatilization of an organic phase is facilitated, and the film forming quality is improved.

Description

Technical field [0001] The invention relates to a solar cell material, in particular to a solar cell conductive paste and a preparation method thereof. Background technique [0002] The shortage of traditional energy sources has made the increasingly serious energy problem more and more prominent. The use of solar cells to convert solar energy into electricity through the photoelectric effect is environmentally friendly and pollution-free. Therefore, research on solar power generation has begun to attract more and more people's attention. In the process of preparing solar cells, the conductive paste is generally coated on the surface of the silicon wafer by means of screen printing, and then dried and sintered to be metalized to form electrodes. [0003] Conductive pastes are divided into polymer silver conductive pastes and sintered silver conductive pastes. Among them, polymer silver conductive pastes use organic polymers as the bonding phase and are dried or cured to form a film...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224H01L31/18
CPCH01B1/16H01B1/22H01B13/00H01L31/022425Y02E10/50Y02P70/50
Inventor 纳迪姆塔希尔王毅纳迪姆法伊卡荆艳艳张志萍金鹏朱胜楠王健
Owner HENAN AGRICULTURAL UNIVERSITY
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