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HJT conductive silver glue composition and its preparation method and HJT solar cell

A technology of conductive silver glue and composition, applied in the direction of conductive adhesives, circuits, adhesives, etc., can solve the problems of poor matching of process parameters, high production costs, high volume resistivity, etc., and achieve excellent and reliable peeling mode, solidification Effect of wide process window and low volume resistivity

Active Publication Date: 2022-03-08
西安宏星电子浆料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, HJT solar cell manufacturers mainly use imported HJT conductive silver glue, which has problems such as high production cost, long delivery time, low tensile force, and poor solderability.
[0005] Some high-strength HJT main grid conductive silver adhesives only increase the welding tensile force by increasing the resin content or the proportion of large particle size silver powder, and their volume resistivity is relatively high. The tensile value is generally marked as the peak maximum tensile force, and the average tensile value is small. , the process window is narrow, and the process parameters of different HJT battery manufacturers cannot be well matched. The pull-off mode of the silver layer after soldering is the pull-off mode of the substrate surface, which has long-term reliability risks

Method used

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  • HJT conductive silver glue composition and its preparation method and HJT solar cell
  • HJT conductive silver glue composition and its preparation method and HJT solar cell
  • HJT conductive silver glue composition and its preparation method and HJT solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] A kind of HJT photovoltaic cell main grid high welding tension conductive silver adhesive, comprising the following components: the content of spherical silver powder is 45.0wt%, the content of flake silver powder is 44.8wt%, glycidyl ether epoxy resin (epoxy equivalent ( g / eq.) is 200), the content is 3.0wt%, the flexible block copolymer is a rubber-toughened epoxy resin, the relative molecular weight is Mr 1000, the content is 4.0wt%, the curing agent is an amine complex, and the content is 0.5wt%, the active diluent is 2-ethylhexyl glycidyl ether, the content is 1.0wt%, the inactive diluent is isophorone, the content is 1.5wt%, the auxiliary agent is dispersant 0.1%, adhesion promoter 0.1 wt%.

[0114] The particle size distribution of spherical silver powder is D100≤2000nm, D50≤800nm, tap density 3~8g / ml, specific surface area 0.8~2.0m 2 / g.

[0115] The particle size distribution of flake silver powder is D100≤20μm, D50≤8μm, the tap density is 3~6g / ml, and the sp...

Embodiment 2

[0118] A kind of HJT photovoltaic cell main grid high welding tension conductive silver adhesive, comprising the following components: the content of spherical silver powder is 45.0wt%, the content of flake silver powder is 44.8wt%, glycidyl ether epoxy resin (epoxy equivalent ( g / eq.) 300) content is 3.0wt%, the flexible blend polymer is a mixture of compounds containing isocyanate groups and polyester polyols, the relative molecular weight is Mr 2000, the content is 4wt%, the curing agent is amine complex The active diluent is 2-ethylhexyl glycidyl ether, the content is 1.0wt%, the inactive diluent is diethylene glycol butyl ether acetate, the content is 1.5wt%, and the auxiliary agent is 0.1% dispersant , Acrylic acid leveling agent 0.1wt%.

[0119] The particle size distribution of spherical silver powder is D100≤2000nm, D50≤800nm, tap density 3~8g / ml, specific surface area 0.8~2.0m 2 / g.

[0120] The particle size distribution of flake silver powder is D100≤20μm, D50≤8μ...

Embodiment 3

[0136] The flexible compound is a polyurethane-modified epoxy resin with an average functionality of 4 and a relative molecular weight Mr of 8000. The epoxy resin has an average functionality of 5 and an epoxy equivalent of 500; the epoxy resin is selected from glycidyl ether epoxy resins. The curing agent is a blocked isocyanate curing agent TDI. The diluent is allyl glycidyl ether, the solubility parameter is 12, the boiling point is 200° C., and the volatilization rate is less than 2.5; the auxiliary agent is a dispersant and a leveling agent.

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Abstract

The invention discloses a HJT conductive silver glue composition, a preparation method thereof and an HJT solar cell. The composition includes: silver powder, epoxy resin, flexible compound, curing agent, diluent and auxiliary agent; the flexible compound includes a flexible block copolymer One or more of polymers, flexible graft copolymers and flexible polymer blends. By weight percentage, it includes: 80-95wt% silver powder, 1-10wt% epoxy resin, 1-10wt% flexible compound, 1-5wt% curing agent, 1-5wt% diluent, and 0.01-5wt% 0.5wt% auxiliary agent; the conductive silver glue of the present invention has good solder wettability and solder erosion resistance, and the resin part after curing has a symmetrical hard segment structure, which can provide stronger cohesion to disperse and consume external stress. At the same time, it can achieve the performance of conductive silver glue with high welding tension.

Description

technical field [0001] The invention belongs to the field of electronic paste, and in particular relates to a HJT conductive silver paste composition, a preparation method thereof, and an HJT solar cell. Background technique [0002] HJT (heterojunction) solar cell is a next-generation solar cell technology based on N-type silicon substrates. The photoelectric conversion efficiency of HJT solar cells in mass production has reached more than 24.7%, compared with traditional crystalline silicon and thin-film cells. HJT cells have the advantages of high photoelectric conversion efficiency, low process temperature, and fewer production process steps. Similar to traditional crystalline silicon solar cells, in industrial production, the surface metallization of HJT solar cells also adopts screen printing process, so conductive silver glue It is one of the key materials of HJT solar cells. Traditional crystalline silicon battery conductive silver paste adopts high temperature sint...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J9/02C09J11/08H01L31/0224H01L31/072
CPCC09J163/00C09J9/02C09J11/08H01L31/022425H01L31/072C08K2003/0806C08K2201/001C08L87/005C08L75/06C08K7/18C08K7/00C08K3/08Y02E10/50
Inventor 沈远征赵科良苏亚军张嘉宁饶龙来姚威龙赵云龙
Owner 西安宏星电子浆料科技股份有限公司