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Front silver paste for solar cell with low contact resistance and high photoelectric conversion efficiency and preparation method of front silver paste

A technology of photoelectric conversion efficiency and low contact resistance, which is applied in the preparation of organic compounds, the preparation of oxygen-containing functional groups, and conductive materials dispersed in non-conductive inorganic materials, etc. The problem of low tension level and high decomposition residual ash can achieve high photoelectric conversion efficiency, avoid incomplete purification and small smooth conduction.

Active Publication Date: 2022-06-24
江苏聚盈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

[0007] The purpose of the present invention is to solve the problem that the binder and thixotropic agent in the organic carrier used to prepare the conductive paste of crystalline silicon solar cells have a lot of residual ash after the battery sheet is sintered, and the solvent is easy to separate out, which eventually leads to the failure of the prepared solar cell. In order to solve the problems of low sheet tension level and low photoelectric conversion efficiency of solar cells, a front silver paste for solar cells with low contact resistance and high photoelectric conversion efficiency and its preparation method are provided

Method used

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  • Front silver paste for solar cell with low contact resistance and high photoelectric conversion efficiency and preparation method of front silver paste
  • Front silver paste for solar cell with low contact resistance and high photoelectric conversion efficiency and preparation method of front silver paste
  • Front silver paste for solar cell with low contact resistance and high photoelectric conversion efficiency and preparation method of front silver paste

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specific Embodiment approach 1

[0038] Embodiment 1: In this embodiment, a front silver paste for solar cells with low contact resistance and high photoelectric conversion efficiency is composed of 85 to 95 parts by weight of silver powder, 1.8 to 3.0 parts of glass powder, and 7 to 12 parts by weight. prepared from an organic carrier;

[0039] The organic carrier is formed by 72 to 86 parts of solvent, 4 to 10 parts of binder, 2 to 5 parts of thixotropic agent, 0.5 to 1.5 parts of dispersant, and 2 to 4 parts of plastic in parts by weight. agent, 5-9 parts coupling agent, 3-4 parts defoaming agent and 0.2-0.6 part auxiliary agent;

[0040] Described binder is polyethyl 5-hydroxy-2-pentenoate;

[0041] Described thixotropic agent is pentaerythritol tetrakis (9-amino-10-hydroxy octadecanoic acid) ester;

[0042] The dispersant is poly-5-(N,N-dimethylamino)-1,4-pentanediol monotriethylamine ether.

specific Embodiment approach 2

[0043] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the silver powder is high tap density spherical small particle size silver powder, and the tap density is 6.0g / cm 3 ~6.5g / cm 3 , the particle size D of high tap density spherical small particle size silver powder 50 0.4μm~1.5μm, D 100 ≤2.8μm. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0044] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the glass powder is a high tensile lead-free glass powder, and the glass powder is 30 to 45 parts by weight of TeO 2 , 15 to 32 Bi 2 O 3 , 12 to 20 B 2 O 3 , 1 to 5 parts of SiO 2 , 0~1 part CaO, 1 part~2 part MgO, 1.5 part~3 part ZnO, 1 part~1.5 part Li 2 O, 0.4 to 1 part Al 2 O 3 , 5~10 parts ZrO 2 , 3~5 parts MoO 3 , 2 to 4 parts of PtO 2 , 1.5 to 3 parts of SrO, 0.5 to 2 parts of WO 3 , 1 to 3 copies of V 2 O 5 , 0~1 part Nb 2 O 5 and 0~1 ReO 2 composition. Other steps are the same as in the first or second embodiment.

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Abstract

The invention discloses front silver paste for a solar cell with low contact resistance and high photoelectric conversion efficiency and a preparation method of the front silver paste, and relates to the technical field of front silver paste for a solar cell and a preparation method of the front silver paste. The invention aims to solve the problems of low tension level of a prepared solar cell and low photoelectric conversion efficiency of the solar cell due to the fact that a binder and a thixotropic agent in an organic carrier used for preparing the conductive paste of the crystalline silicon solar cell in the prior art are more in decomposed residual ash content after the cell is sintered and a solvent is easy to separate out. In the front silver paste for the solar cell with low contact resistance and high photoelectric conversion efficiency, a binding agent is poly (5-hydroxy-2-ethyl pentenoate), a thixotropic agent is pentaerythritol tetra (9-amino-10-hydroxy octadecanoic acid) ester, and a dispersing agent is poly (5-(N, N-dimethylamino)-1, 4-pentanediol monotriethylamine ether. The front silver paste for the solar cell, which is low in contact resistance and high in photoelectric conversion efficiency, can be obtained.

Description

technical field [0001] The technical field relates to a front silver paste for solar cells and a preparation method thereof. Background technique [0002] As an important auxiliary component in the conductive paste of crystalline silicon solar cells, the organic carrier itself has no direct contribution to the electrical conductivity of the cell. However, it plays a crucial role in the printability and photoelectric conversion efficiency of silver paste. The organic carrier is mainly composed of solvents, binders, anti-sag agents and wetting agents, which endow the silver paste system with fluidity, cohesiveness, "one-touch" function, and dispersibility, respectively, making the silver paste system. Powder materials such as silver powder and glass powder can be well dispersed in multi-component liquids and at the same time realize fast response to external shear stress or shear rate. In addition, a good organic carrier can also ensure that the powder wrapped by the carrier...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224C08G65/26C08F120/28C07F3/06C07D307/14C07D307/12C07C227/18C07C227/06C07C67/31C07C67/08C07C51/363C07C45/75C07C29/14
CPCH01B1/16H01B1/22H01B13/00H01L31/022425C08F120/28C08G65/2609C07C51/363C07C67/08C07F3/06C07C67/31C07C45/75C07C29/14C07C227/06C07C227/18C07D307/12C07D307/14C07C57/54C07C69/653C07C69/732C07C47/19C07C31/245C07C229/22Y02E10/50
Inventor 柳静席军涛马生华王惠
Owner 江苏聚盈新材料科技有限公司
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