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High-tensile strength anti-hidden cracking solar cell back side silver slurry and preparation method thereof

A solar cell, high-strength technology, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems such as short service life and silicon layer shedding, and achieve the effect of convenient sampling

Active Publication Date: 2016-12-14
ZHEJIANG GUANGLONG ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing silver paste on the back side mainly has the following problems during use: 1. After the silver paste is applied to the surface of the silicon wafer, most of the battery wafers are in a cracked state, resulting in a large area of ​​silicon layer peeling off during the tensile test. Short life; 2. The pull force of the back pole of the cell is generally 2.5N. Therefore, it is necessary to design a silver paste on the back of the solar cell with high pull force and anti-cracking and its preparation method

Method used

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  • High-tensile strength anti-hidden cracking solar cell back side silver slurry and preparation method thereof
  • High-tensile strength anti-hidden cracking solar cell back side silver slurry and preparation method thereof
  • High-tensile strength anti-hidden cracking solar cell back side silver slurry and preparation method thereof

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preparation example Construction

[0065] The preparation method of the silver paste on the back side of the solar cell with high tensile strength and anti-cracking comprises the following steps:

[0066] a. Preparation of glass powder: Weigh the raw materials for preparing glass powder according to the formula ratio, mix them evenly, dry in an oven at 120-220°C for 1-1.5h, and then preheat at 700-850°C for 0.5-1.0h , then smelted at 1000-1400°C for 1 hour, quenched with deionized water and dried, then ball milled for 5-10 hours, dried and sieved to obtain glass powder with an average particle size of less than 5 μm; the raw materials of glass powder in step a are mixed Finally, it needs to be ground and dispersed until the color is uniform, and then dried;

[0067] b. Preparation of organic adhesive: After weighing the raw materials for preparing organic adhesive according to the formula ratio, after mixing evenly, heat and stir in a mixer at a temperature of 90-160°C, dissolve for 1.5-2.5h, and obtain an orga...

Embodiment 1

[0081] a, the preparation of glass powder: take by weighing Bi 2 o 3 41.9%, CaO 8.2%, ZnO 16.8%, TiO 2 0.7%, Al 2 o 3 9.3%, SiO 2 6.6%, B 2 o 3 16.5%, after mixing evenly, dry in an oven at 165°C for 1h, then preheat at 750°C for 0.8h, then melt at 1200°C for 1h, quench with deionized water and dry, then ball mill for 8h, dry Finally, sieve to obtain glass powder with an average particle size of less than 5 μm;

[0082] b. Preparation of organic binder: Weigh 8.5% of alcohol ester twelve, 65.8% of butyl carbitol acetate, 8.3% of ethyl cellulose, 12.3% of diethylene glycol butyl ether, polyvinyl butyral 2.5%, sorbitan stearate 2.6%, after mixing evenly, stir while heating at a temperature of 120° C. in a blender, dissolve for 2 hours, and obtain an organic binder;

[0083] c. Preparation of silver paste on the back side: according to the ratio of silver powder 62.1%, glass powder 3.5%, organic adhesive 28%, adhesion promoter 1.2%, auxiliary agent 1.2% and additive 4...

Embodiment 2

[0090] a, the preparation of glass powder: take by weighing Bi 2 o 3 31.5%, CaO 11%, ZnO 18.8%, TiO 2 0.6%, Al 2 o 3 11.8%, SiO 2 9.8%, B 2 o 3 16.5%, after mixing evenly, dry in an oven at 165°C for 1h, then preheat at 750°C for 0.8h, then melt at 1200°C for 1h, quench with deionized water and dry, then ball mill for 8h, dry Finally, sieve to obtain glass powder with an average particle size of less than 5 μm;

[0091] b. Preparation of organic binder: Weigh 12.5% ​​of alcohol ester dodecyl, 55.6% of butyl carbitol acetate, 8.8% of ethyl cellulose, 16.3% of diethylene glycol butyl ether, polyvinyl butyral 2.6%, sorbitan stearate 4.2%, after mixing evenly, stir while heating in a mixer at a temperature of 120° C., dissolve for 2 hours, and obtain an organic binder;

[0092] c, the preparation of silver paste on the back: according to the ratio of silver powder 58.8%, glass powder 5.6%, organic adhesive 29.7%, adhesion promoter 1.5%, auxiliary agent 1.4% and additiv...

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Abstract

The invention provides high-tensile strength anti-hidden cracking solar cell back side silver slurry and a preparation method thereof. Technical problems are solved that firstly, a large area of a silicon layer falls off during a tensile test caused by the fact that cell sheets are almost in the hidden cracked state after the current silver slurry is applied to the surfaces of the silicon sheets; and secondly, the tensile of a back pole of each cell sheet is 2.5N generally. The high-tensile strength anti-hidden cracking solar cell back side silver slurry comprises following components of, by weight, 28-46% of sheet-shaped silver powder, 12-28% of nano silver powder, 3.2-5.8% of glass powder, 25-30% of organic adhesives, 0.3-1.6% of adhesion promoter, and 0.8-1.5% of auxiliaries, 3-5% of additives, wherein the sum of the components in percentage by weight is 100%. According to the high-tensile strength anti-hidden cracking solar cell back side silver slurry and the preparation method thereof, the tension of the back side can reach 4N or above, the welding performance is strong and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic materials for solar cells, and relates to a silver paste on the back of a solar cell with high tensile strength and anti-cracking and a preparation method thereof. Background technique [0002] With the depletion of various traditional energy sources and the increasing severity of the greenhouse effect, people's demand for various new clean energy sources is becoming more and more urgent. Solar crystalline silicon photovoltaic power generation system is a new type of power generation system that uses the photovoltaic effect of silicon cell semiconductors to directly convert solar radiation energy into electrical energy. It has the advantages of regeneration and no pollution. Among them, the back silver paste is an important part of solar cells, which is prepared from silver powder, glass powder, organic binder and other additives. The silver paste on the back is the first paste in the silk s...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00G01L1/00G01N19/04H01L31/0224
CPCG01L1/00G01N19/04H01B1/22H01B13/00H01L31/022425
Inventor 朱金浩蒋剑波朱世杰许布万光耀陈珏荣吴振宏文长洪
Owner ZHEJIANG GUANGLONG ENERGY TECH
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