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Back electrode silver paste for crystalline silicon solar cell and preparation method of back electrode silver paste

A technology of solar cells and back electrodes, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of relying on imports of raw materials and restricting the healthy development of the photovoltaic industry, and achieve improved photoelectric conversion efficiency, reducing the series resistance of the silver film, and improving the conductivity

Inactive Publication Date: 2017-05-10
HANGZHOU HANGSHUO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key equipment and raw materials of solar cells in our country rely heavily on imports, especially the electrode silver pastes of crystalline silicon solar cells mostly use imported silver pastes, such as DuPont in the United States and Samsung in South Korea, etc., which seriously restricts the sound development of my country's photovoltaic industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of an organic carrier: add an organic solvent into a container, stir and heat up to 80° C., add an organic resin, heat and stir for 3 hours until completely dissolved, and filter to obtain an organic carrier; the organic solvent is α-terpineol, The organic resin is ethyl cellulose, and the weight ratio of the organic solvent to the organic resin is 8:1.

[0025] (2) Preparation of slurry: mix ultra-fine spherical silver powder, flake silver powder, inorganic glass powder, nano-lanthanum hexaboride, organic vehicle and organic additives, stir it into a paste with a mixer, and grind it with a three-roll mill to achieve fineness Requirements, that is, to obtain the silver paste of the back electrode of the crystalline silicon solar cell.

[0026] In terms of parts by weight, the dosage of each component is: 30 parts of ultrafine spherical silver powder, 20 parts of flake silver powder, 5 parts of inorganic glass powder, 0.8 part of nano-lanthanum hexaboride...

Embodiment 2

[0028] (1) Preparation of an organic carrier: add an organic solvent into a container, stir and heat up to 90° C., add an organic resin, heat and stir for 2 hours until completely dissolved, and filter to obtain an organic carrier; the organic solvent is α-terpineol, The organic resin is ethyl cellulose, and the weight ratio of the organic solvent to the organic resin is 5:1.

[0029] (2) Preparation of slurry: mix ultra-fine spherical silver powder, flake silver powder, inorganic glass powder, nano-lanthanum hexaboride, organic vehicle and organic additives, stir it into a paste with a mixer, and grind it with a three-roll mill to achieve fineness Requirements, that is, to obtain the silver paste of the back electrode of the crystalline silicon solar cell.

[0030] In terms of parts by weight, the dosage of each component is: 35 parts of ultrafine spherical silver powder, 15 parts of flake silver powder, 5 parts of inorganic glass powder, 0.8 part of nano-lanthanum hexaboride...

Embodiment 3

[0032] (1) Preparation of an organic carrier: add an organic solvent into a container, stir and heat up to 100° C., add an organic resin, heat and stir for 3 hours until completely dissolved, and filter to obtain an organic carrier; the organic solvent is α-terpineol, The organic resin is ethyl cellulose, and the weight ratio of the organic solvent to the organic resin is 10:1.

[0033] (2) Preparation of slurry: mix ultra-fine spherical silver powder, flake silver powder, inorganic glass powder, nano-lanthanum hexaboride, organic vehicle and organic additives, stir it into a paste with a mixer, and grind it with a three-roll mill to achieve fineness Requirements, that is, to obtain the silver paste of the back electrode of the crystalline silicon solar cell.

[0034] In terms of parts by weight, the dosage of each component is: 35 parts of ultrafine spherical silver powder, 25 parts of flake silver powder, 2 parts of inorganic glass powder, 0.5 part of nano-lanthanum hexabori...

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Abstract

The invention relates to back electrode silver paste for a crystalline silicon solar cell and a preparation method of the back electrode silver paste. The back electrode silver paste for the crystalline silicon solar cell is prepared from the following components in parts by weight: 25-35 parts of superfine spherical silver powder, 15-25 parts of flake silver powder, 2-6 parts of inorganic glass powder, 0.5-1 part of nano lanthanum hexaboride, 34-52 parts of organic carrier and 1-10 parts of organic additive. By adopting the combination of the superfine spherical silver powder and the flake silver powder, a gap between layers of the flake silver powder is filled with superfine silver powder particles, so that the conductivity of the silver paste is improved. The nano lanthanum hexaboride is added, so that the series resistance of a silver film can be reduced when the nano lanthanum hexaboride is used for the electrode silver paste, and the photoelectric conversion efficiency of the solar cell is greatly improved and can reach 18.88%.

Description

technical field [0001] The invention relates to a solar cell electrode material, in particular to a crystalline silicon solar cell back electrode silver paste and a preparation method thereof. Background technique [0002] Solar energy is an inexhaustible renewable new energy source for human beings, and it is also a clean energy source that does not produce any environmental pollution. Therefore, solar energy is considered to be the most important new energy source in the 21st century. More and more countries have begun to implement the "Sunshine Plan" to develop solar energy resources and seek new impetus for economic development. Driven by the huge potential of the international photovoltaic market, the solar cell manufacturing industries of various countries are scrambling to invest huge sums of money and expand production in order to compete for a place. [0003] At present, my country's solar cell production has exceeded 20GW, and it is the world's largest producer o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01B13/00H01L31/022425Y02E10/50
Inventor 杨国英黄超锋兰金国
Owner HANGZHOU HANGSHUO NEW MATERIAL TECH CO LTD
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