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Graphene solar HJT cell front silver paste and preparation method thereof

A technology of graphene and solar energy, applied in the field of solar HJT batteries, can solve problems affecting production capacity, reducing graphene performance, increasing curing temperature, etc.

Active Publication Date: 2022-02-08
南通俊丰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the traditional high-temperature single-crystal PERC silver paste, the current HJT low-temperature silver paste has disadvantages such as large volume resistance, poor printability, and poor adhesion between grid lines and silicon wafers, and the curing process is compared with traditional high-temperature single-crystal PERC silver paste. , takes a long time, which greatly affects the production capacity
[0003] In existing patents, glass powder is usually added to improve performance, but glass powder usually contains lead and other metal particles that pollute the environment, and the addition of glass powder will increase the curing temperature
Therefore, oxides, graphene, etc. are used instead and modified to increase dispersion, but the addition of modified substances will change the thixotropy of the silver paste; at the same time, oxidation, oxidation and reduction of graphene will make Graphene has a large number of defects, which reduces the performance of graphene itself and affects the stability of the front silver paste

Method used

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  • Graphene solar HJT cell front silver paste and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1: Set the temperature of the resin and solvent to 95°C, stir and mix until clear and transparent, and control the viscosity to 30Kcps to obtain an organic vehicle;

[0034] S2: Mix 10% nano-silver powder, 81.5% flake silver powder, 7.5% organic vehicle, 0.5% organic additives, and 0.5% graphene; place it in a planetary mixer, set the speed at 30~35rpm, and the temperature at 25°C Stir for 30 minutes; place in a three-roll mill, grind and disperse until the fineness is less than 6 μm, adjust the viscosity, and obtain a front silver paste with a viscosity of 400Kcps.

[0035] In this technical scheme, the particle diameter D50 of the nano-silver powder is 160nm, and the specific surface area is 18m 2 / g; the particle size D50 of the flake silver powder is 5 μm, and the specific surface area is 6m 2 / g; The monolayer thickness of described graphene is 15nm, and particle diameter D50 is 1.0 μm, and specific surface area is 15m 2 / g, the resistivity is less than 10 -7 ...

Embodiment 2

[0037] S1: Set the temperature of the resin and solvent to 100°C, stir and mix until clear and transparent, and control the viscosity to 28Kcps to obtain an organic vehicle;

[0038] S2: Mix 9.5g nanometer silver powder, 82g flake silver powder, 7.5g organic carrier, 0.5g organic additive, and 0.5g graphene; place in a planetary mixer, set the speed at 35rpm, and stir at 25°C for 30min; Place in a three-roll mill, grind and disperse to a fineness of less than 6 μm, adjust the viscosity, and obtain a front silver paste with a viscosity of 400Kcps.

[0039] In this technical scheme, the particle diameter D50 of the nano-silver powder is 160nm, and the specific surface area is 18m 2 / g; the particle size D50 of the flake silver powder is 5 μm, and the specific surface area is 6m 2 / g; The monolayer thickness of described graphene is 15nm, and particle diameter D50 is 1.0 μm, and specific surface area is 15m 2 / g, the resistivity is less than 10 -7 Ω·m; the resin is bisphenol ...

Embodiment 3

[0041] S1: Set the temperature of the resin and solvent to 90°C, stir and mix until clear and transparent, and obtain an organic vehicle with a viscosity of 35Kcps;

[0042] S2: (1) Weigh and mix dopamine and polyethylene glycol-poly(4-sodium styrene sulfonate) copolymer according to the mass ratio of 1:0.85, and then dissolve them in Tris buffer to obtain a concentration of 0.1g / Mixed solution A of L; immerse the nano-silver powder A in the mixed solution A at 25°C and ultrasonically disperse it, and stir for 20 hours to obtain the nano-silver powder A; (2) The volume ratio of polyvinylpyrrolidone, dopamine solution, and Tris buffer is 10:1:1, disperse graphene in 4g / L polyvinylpyrrolidine copper solution, stir for 12 hours; add 0.5g / mL dopamine solution, stir for 2 hours; add Tris buffer, stir for 20 hours to get Graphene A; (3) Premix nano-silver powder A with flaky silver powder, add organic carrier and organic additives and mix evenly, add graphene A and mix evenly, plac...

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Abstract

The invention discloses graphene solar HJT cell front silver paste and a preparation method thereof. The front silver paste is prepared from the following raw materials in percentage by weight: 5-20% of nano silver powder, 70-90% of flake silver powder, 2-10% of an organic carrier, 0.1-5% of an organic auxiliary agent and 0.1-1% of graphene. The front silver paste has the beneficial effects that (1) the nano silver powder with a specific size and the flake silver powder are mixed for use, and the graphene is added, so that the morphology of a silver network is improved, the densification is increased, and the resistivity during low-temperature curing is reduced; (2) on the basis of not changing the thixotropy of the front silver paste, the nano silver powder and the graphene are modified to increase the dispersity of substances, so that the stability of the silver paste is improved; and meanwhile, through surface modification, the printability of the silver paste is improved, the heterojunction quality of a solar cell is improved, and the photoelectric conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of solar HJT batteries, in particular to the front silver paste of graphene solar HJT batteries and a preparation method thereof. Background technique [0002] At present, the industrialization technology of monocrystalline PERC solar cells is relatively mature, and it is becoming more and more difficult to improve the power generation efficiency by simply improving the cell technology in follow-up research, which makes the research on other high-efficiency new cells increase. Among them, the HJT heterojunction cell is ITO / IWO deposited on the front side of the N-type single crystal silicon wafer, and then the metallization process is performed. Compared with the conventional single crystal PERC cell, it has the advantages of high conversion efficiency and low light depletion, and Its metallization process adopts the form of low-temperature curing, which greatly reduces the energy loss in the production proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/24H01B13/00H01L31/0224
CPCH01B1/22H01B1/24H01B13/00H01L31/022425Y02E10/50
Inventor 张彦陶俊
Owner 南通俊丰新材料科技有限公司
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