HJT low-temperature silver paste capable of being rapidly cured and sintered and preparation method of HJT low-temperature silver paste

Abstract

The invention discloses an HJT low-temperature silver paste capable of being rapidly cured and sintered, which comprises the following raw materials in percentage by weight: 88-94% of micron silver powder, 0.05-4% of nano silver powder, 2-5% of alicyclic epoxy resin, 0.5-4% of bisphenol epoxy resin, 0.1-0.5% of curing agent, 2-5% of organic solvent and 0-1.5% of organic assistant. The particle size of the nano silver powder is 5 to 20 nm; when the curing temperature is 150-180 DEG C, the curing time of the HJT low-temperature silver paste capable of being rapidly cured and sintered is 8-20 min. The invention further provides a preparation method of the HJT low-temperature silver paste capable of being quickly cured and sintered, a process of pre-dispersing nano silver powder and then mixing is adopted, the micron silver powder and the nano silver powder contained in the prepared HJT low-temperature silver paste capable of being quickly cured and sintered are uniformly distributed, the curing time is short, the temperature is low, and the HJT low-temperature silver paste capable of being quickly cured and sintered has relatively low contact resistance.

Description

technical field [0001] The invention relates to the technical field of solar cell materials, in particular to a rapidly solidified and sintered HJT low-temperature silver paste and a preparation method thereof. Background technique [0002] Solar power generation is a new type of power generation technology that uses the photovoltaic effect to directly convert sunlight energy into electrical energy. It has the advantages of cleanness, environmental protection, safety and reliability, rich resources, and wide application fields. It is considered to be the most promising new energy utilization technology in the future. one. [0003] As one of the new high-efficiency solar cells, heterogeneous crystalline silicon solar cells (HJT Silicon Solar Cell, HJT) have the characteristics of simple preparation process, no high temperature sintering, high conversion efficiency, low temperature coefficient, and no light decay. capital attention. [0004] The current low-temperature curin...

AI Technical Summary

Problems solved by technology

[0004] The current low-temperature curing silver paste used in the production of HJT crystalline silicon solar cells needs more than 30 minutes of single curing time after drying, and the total curing time is about 90 minutes. The long curing time cannot meet the production needs of high output.

However, if the HJT low-temperature curing silver paste of the prior art is cured at too fast a low temperature, problems such as solvent residue in the silver layer, insufficient sintering compactness, and incomplete resin curing will be caused, resulting in poor conductivity and reliability of the HJT solar cell.

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