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A kind of low-temperature conductive nano paste for heterojunction solar cells and preparation method thereof

A solar cell, conductive nanotechnology, applied in cable/conductor manufacturing, nanotechnology for materials and surface science, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problem of high temperature resistance, silver powder consumption The problem of large amount and high curing temperature can achieve the effect of reducing curing temperature, reducing dosage and good performance.

Active Publication Date: 2022-05-17
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heterojunction solar cells contain an amorphous silicon passivation layer, so they cannot withstand high temperatures like conventional solar cells, and must use low-temperature silver paste cured below 200 °C
The low-temperature curing silver paste currently used is mainly epoxy-based low-temperature silver paste. The silver powder used is usually micron-sized and the addition amount usually needs to reach 90%, resulting in high curing temperature, and due to the large consumption of silver powder. The paste cost is high, and at the same time, due to the large particle size of the silver powder, there will be a certain hanging phenomenon during the printing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The mass percentage of nano-silver powder in the low-temperature conductive nano-paste for HIT solar cells is 60%; the mass percentage of nano-tin powder in the low-temperature conductive nano-paste for HIT solar cells is 10%; The mass percentage in the conductive nano-slurry is 10%; the mass percentage of the resin (a mixture of bisphenol A epoxy resin and polyurethane resin prepolymer with a mass ratio of 1:1) in the low-temperature conductive nano-slurry for HIT solar cells 10%, the mass percentage of the solvent (terpineol and diethylene glycol butyl ether acetate mass ratio of 1:1) in the low-temperature conductive nano-slurry for HIT solar cells is 9%, and the additive (triethyl ether The mass percent of amine) in the low-temperature conductive nano-slurry for HIT solar cells is 0.5%, the mass percentage of thixotropic agent (fumed silica) in the low-temperature conductive nano-slurry for HIT solar cells is 0.3%, and the dispersant ( The mass percentage of the mix...

Embodiment 2

[0042] The mass percentage of nano-silver powder in the low-temperature conductive nano-paste for HIT solar cells is 70%; the mass percentage of nano-tin powder in the low-temperature conductive nano-paste for HIT solar cells is 1%; The mass percentage in the conductive nano-slurry is 9%; the mass percentage of the resin (a mixture of bisphenol A epoxy resin and polyurethane resin prepolymer with a mass ratio of 1:2) in the low-temperature conductive nano-slurry for HIT solar cells 9%, the mass percentage of the solvent (a mixture of terpineol and diethylene glycol dibutyl ether with a mass ratio of 1:3) in the low-temperature conductive nano-slurry for HIT solar cells is 10%, and the additive (dilauric acid The mass percentage of dibutyltin) in the low-temperature conductive nano-slurry for HIT solar cells is 0.4%, the mass percentage of thixotropic agent (fumed silica) in the low-temperature conductive nano-slurry for HIT solar cells is 0.3%, and the dispersant (a mixture of...

Embodiment 3

[0046]The mass percentage of nano-silver powder in the low-temperature conductive nano-paste for HIT solar cells is 65%; the mass percentage of nano-tin powder in the low-temperature conductive nano-paste for HIT solar cells is 5%; The mass percentage in the conductive nano-slurry is 10%; the mass percentage of the resin (a mixture of bisphenol A epoxy resin and polyurethane resin prepolymer with a mass ratio of 1:3) in the low-temperature conductive nano-slurry for HIT solar cells 9%, the solvent (the mixture of terpineol and diethylene glycol butyl ether acetate with a mass ratio of 1:5) in the low-temperature conductive nano-slurry for HIT solar cells is 10%, and the additive (triethyl ether The mass percent of amine) in the low-temperature conductive nano-slurry for HIT solar cells is 0.4%, the mass percentage of thixotropic agent (fumed silica) in the low-temperature conductive nano-slurry for HIT solar cells is 0.3%, and the dispersant ( The mass percentage of the mixtur...

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Abstract

The invention discloses a low-temperature conductive nano slurry for heterojunction (HIT) solar cells and a preparation method thereof, belonging to the technical field of conductive slurry preparation. The low-temperature conductive nano paste includes nano-silver powder, nano-tin powder, nano-graphite powder, resin, solvent, auxiliary agent, thixotropic agent and dispersant; the mass percentage of each component is as follows: nano-silver powder: 60-70%; Tin powder: 1‑20%; nano graphite powder: 1‑10%; resin: 5‑15%; solvent: 5‑15%; additive: 0.3‑0.5%; thixotropic agent: 0.1‑0.3%; dispersant : 0.1‑0.3%. The present invention innovatively uses the combination of nano-silver powder, nano-tin powder and nano-graphite powder as the conductive functional phase to prepare a low-temperature conductive nano-slurry for HIT solar cells, and the prepared low-temperature nano-slurry for HIT solar cells has good performance and can Effectively improve the photoelectric conversion efficiency of HIT solar cells.

Description

technical field [0001] The invention relates to a low-temperature conductive nano slurry for heterojunction solar cells and a preparation method thereof, belonging to the technical field of conductive nano slurry preparation. Background technique [0002] Since the production process of heterojunction solar cells is relatively simple, the process temperature is low, it can be adapted to thin sheets, and it has the characteristics of double-sided power generation, so it has become the mainstream development direction of solar cells. However, heterojunction solar cells contain an amorphous silicon passivation layer, so they cannot withstand high temperatures like conventional solar cells, and must use low-temperature silver paste cured below 200 °C. The low-temperature curing silver paste currently used is mainly epoxy-based low-temperature silver paste. The silver powder used is usually micron-sized and the addition amount usually needs to reach 90%, resulting in a high curin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224H01L31/072B82Y30/00B82Y40/00
CPCH01B1/22H01B13/0016B82Y30/00B82Y40/00H01L31/022425H01L31/072Y02E10/50
Inventor 郭少青孙万兴高丽兵卫贤贤曹艳芝董弋刘洋
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY