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Method for preparing crystalline silicon solar cell electrode through laser melting

A technology of solar cells and laser melting, applied in photovoltaic power generation, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. To achieve the effect of maintaining the flow viscosity, lowering the adhesive strength, and increasing the peelability

Active Publication Date: 2022-07-05
一道新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing electrode materials are silver electrode pastes, which can be used to obtain solar cell electrodes after laser irradiation. Because the laser process is stable and easy to adjust, it is often used to prepare fine metal electrodes. Metal electrodes are formed by laser sintering. In this way, the metal electrode may be disconnected somewhere due to weak bonding force, which will affect the conductivity. After the groove is made through the adhesive layer, the conductive paste is filled, and the laser irradiation is carried out to connect with the silicon wafer. This method may cause the adhesive layer to melt. Dispersion, so that the problem that the dispersion affects the conductivity of the surface layer of the silicon wafer; therefore, a new method for preparing crystalline silicon solar cell electrodes by laser melting is needed to improve the deficiencies of the existing technology

Method used

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  • Method for preparing crystalline silicon solar cell electrode through laser melting
  • Method for preparing crystalline silicon solar cell electrode through laser melting

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 A method for preparing a crystalline silicon solar cell electrode by laser melting, including:

[0027] 1. Preparation of electrode paste

[0028] 1. Heat and melt 1 part of acrylic resin, add 3 parts of ethyl cellulose, stir and mix, then add the mixture to terpineol and butyl carbitol acetate solution and blend to obtain an organic carrier;

[0029] 2. Add 1 part of lead-free low-melting glass powder and 30 parts of nano-silver powder into 15 parts of organic carrier, disperse and stir, and grind to a small particle size by a grinder after drying to prepare electrode slurry, and its particle size is 10 -12um, providing powder with smaller particle size, which can optimize the conductivity of the electrode;

[0030] 2. Preparation of solar cell electrodes

[0031] 1. Prepare electrode slurry for standby, and prepare silicon wafers with PN junction after texturing, diffusion and PECVD processes for standby;

[0032] 2. Prepare a transparent conductive la...

Embodiment 2

[0037] Embodiment 2 A method for preparing a crystalline silicon solar cell electrode by laser melting, comprising:

[0038] 1. Preparation of electrode paste

[0039] 1. Heat and melt 2 parts of acrylic resin, add 5 parts of ethyl cellulose, stir and mix, then add the mixture to terpineol and butyl carbitol acetate solution and blend to obtain an organic carrier;

[0040] 2. Add 3 parts of lead-free low-melting glass powder and 35 parts of nano-silver powder into 17 parts of organic carrier, disperse and stir, and grind it to a small particle size by a grinder after drying, and then the electrode slurry can be prepared, and its particle size is 10 -12um, providing powder with smaller particle size, which can optimize the conductivity of the electrode;

[0041] 2. Preparation of solar cell electrodes

[0042] 1. Prepare electrode slurry for standby, and prepare silicon wafers with PN junction after texturing, diffusion and PECVD processes for standby;

[0043] 2. Prepare a ...

Embodiment 3

[0047] Embodiment 3 A method for preparing a crystalline silicon solar cell electrode by laser melting, comprising:

[0048] 1. Preparation of electrode paste

[0049] 1. Heat and melt 3 parts of acrylic resin, add 7 parts of ethyl cellulose, stir and mix, then add the mixture to terpineol and butyl carbitol acetate solution and blend to obtain an organic carrier;

[0050] 2. Add 5 parts of lead-free low-melting glass powder and 40 parts of nano-silver powder into 20 parts of organic carrier, disperse and stir, and grind to a small particle size by a grinder after drying to prepare electrode slurry, and its particle size is 10 -12um, providing powder with smaller particle size, which can optimize the conductivity of the electrode;

[0051] 2. Preparation of solar cell electrodes

[0052] 1. Prepare electrode slurry for standby, and prepare silicon wafers with PN junction after texturing, diffusion and PECVD processes for standby;

[0053] 2. Prepare a transparent conductive l...

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Abstract

The invention relates to the technical field of crystalline silicon solar cells, in particular to a method for preparing an electrode of a crystalline silicon solar cell through laser melting. The method comprises the following steps: preparing transparent conductive layers on the upper and lower surfaces of a silicon wafer respectively, coating adhesive layers on the surfaces of the transparent conductive layers, manufacturing an electrode pattern template, pressing the electrode pattern template on the surfaces of the adhesive layers, and penetrating through the adhesive layers to be attached to the conductive layers; the adhesive layer is solidified after standing, then the electrode pattern template is taken out, and a groove is formed in the surface of the adhesive layer; electrode slurry is introduced into the groove, and standing is carried out after first-step high-temperature heating is carried out; and after standing, removing the adhesive layer, and irradiating the electrode slurry through laser to complete the preparation of the battery electrode. The adhesive layer is stripped from the surface of the silicon wafer in advance in a two-time high-temperature heating mode, the electrode slurry and the conductive layer are preliminarily bonded after first-time heating, and after the adhesive layer is removed, in the second-time laser melting step, components of the adhesive layer can be prevented from being fused into the conductive layer, and the influence of the components of the adhesive layer on conductivity is reduced.

Description

technical field [0001] The invention relates to the technical field of crystalline silicon solar cells, in particular to a method for preparing electrodes of crystalline silicon solar cells by laser melting. Background technique [0002] The solar cell electrode mainly plays the role of collecting current, and the resistivity and other properties of the electrode material itself have a great influence on the extraction of photogenerated electricity from the solar cell. At the same time, since the electrodes are printed on the light-receiving surface, the light-receiving surface of the solar cell will be reduced; therefore, the solar cell electrode is one of the important factors determining the conversion efficiency of the solar cell. [0003] Most of the existing electrode materials are silver electrode paste, which is irradiated by laser to obtain solar cell electrodes. Because the laser process is stable and easy to adjust, it is often used to prepare fine metal electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01B1/16H01B1/22H01B13/00
CPCH01L31/022425H01B13/0016H01B13/003H01B13/0026H01B1/16H01B1/22Y02P70/50
Inventor 舒华富王建明蔡敬国刘凯刘勇
Owner 一道新能源科技股份有限公司
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