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Back silver paste for low-silver-content crystalline silicon solar battery and preparation method thereof

A technology of solar cells and silver content, which is used in cable/conductor manufacturing, circuits, electrical components, etc., can solve the problems of lack of market competitiveness of back silver paste and high metal silver price, and meet the requirements of solderability and adhesion. The effect of reducing production cost and reducing production burden

Inactive Publication Date: 2015-04-08
NINGBO GUANGBO NEW NANOMATERIALS STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive metal powder can be gold, platinum, silver, or alloy powder. At present, the silver paste on the market generally uses metallic silver powder, but the price of metallic silver is relatively high. With the increasing cost pressure of enterprises, The back silver paste purely using metallic silver powder has no market competitiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Metal conductive powder

[0017] A spherical silver-coated copper powder with a structure of core-shell coating, a silver content of 40%, and a particle size of 1.2 μm was selected.

[0018] 2. Preparation of modified organic binder

[0019] Weigh 50% terpineol, 17% butyl carbitol, 20% butyl carbitol acetate, 5% ethyl cellulose, 3.5% organosilicon compound, 2% hydrogenated castor oil , 2.5% additives, the above materials are mixed and heated to 80 ° C for 100 minutes to dissolve, and a transparent colloid with good lubricity and printability is obtained.

[0020] 3. Preparation of inorganic binder metallic glass powder

[0021] Weigh 32.5% of B 2 o 3 , 30%% Bi 2 o 3 , 15% SiO 2 , 15% Al 2 o 3 , 5% ZnO, 2.5% PbF 2 . After mixing the above raw materials evenly with a mixer, put them into a ceramic crucible, dry them in an oven at 150°C for 2 hours, put them in a muffle furnace, melt them at 1000°C for 1 hour, and dry them after water quenching, then use a pl...

Embodiment 2

[0029] 1. Metal conductive powder

[0030] A spherical silver-coated copper powder with a structure of core-shell coating, a silver content of 35%, and a particle size of 1.0 μm was selected.

[0031] 2. Preparation of modified organic binder

[0032] Weigh 50% terpineol, 17% butyl carbitol, 20% butyl carbitol acetate, 5% ethyl cellulose, 3.5% organosilicon compound, 2% hydrogenated castor oil , 2.5% additives, the above materials are mixed and heated to 90 ° C for 100 minutes to dissolve, and a transparent colloid with good lubricity and printability is obtained.

[0033] 3. Preparation of glass powder

[0034] Weigh 32.5% of B 2 o 3 , 30%% Bi 2 o 3 , 15% SiO 2 , 15% Al 2 o 3 , 5% ZnO, 2.5% PbF 2 After mixing evenly with a mixer, put it into a ceramic crucible, dry it in an oven at 150°C for 2h, put it in a muffle furnace, melt it at 1100°C for 1h, and dry it after water quenching, then dry it with a planetary ball mill for 3h to obtain Metallic glass powder below ...

Embodiment 3

[0042] 1. Metal conductive powder

[0043] A spherical silver-coated copper powder with a structure of core-shell coating, a silver content of 40%, and a particle size of 1.2 μm was selected.

[0044] 2. Preparation of modified organic binder

[0045] Weigh 50% terpineol, 17% butyl carbitol, 20% butyl carbitol acetate, 5% ethyl cellulose, 3.5% organosilicon compound, 2% hydrogenated castor oil , 2.5% additives, the above materials are mixed and heated to 100 ℃ to dissolve 100min, to obtain a transparent colloid with good lubricity and printability.

[0046] 3. Preparation of glass powder

[0047] Weigh 20% of B 2 o 3 , 50% Bi2O3, 10% SiO 2 , 12% Al 2 o 3 , 5% ZnO, 3.0% PbF 2 After mixing evenly with a mixer, put it into a ceramic crucible, dry it in an oven at 150°C for 2h, put it in a muffle furnace, melt it at 1200°C for 1h, and dry it after water quenching, then use a planetary ball mill for 3h, and dry it to get Metallic glass powder below 5μm.

[0048] 4. Prepar...

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Abstract

The invention discloses back silver paste for a low-silver-content crystalline silicon solar battery. The back silver paste is prepared by components including, by weight percentage, 50-64% of spherical silver coated copper powder, 25-40% of modified organic adhesive and 1-10% of inorganic adhesive. The invention further discloses a preparation method of the back silver paste for the low-silver-content crystalline silicon solar battery. The back silver paste is prepared by spherical silver coated copper powder for the low-silver-content crystalline silicon solar battery has the advantages that production cost of the paste is reduced, production burden of photovoltaic enterprises is alleviated, and requirements for weldability and adhesion force of the battery can be met.

Description

technical field [0001] The invention relates to the technical field of back silver paste for crystalline silicon solar cells, in particular to a back silver paste for crystalline silicon solar cells with low silver content and a preparation method thereof. Background technique [0002] With the increasing emphasis on the environment and the increasing shortage of traditional energy sources around the world, the photovoltaic industry represented by crystalline silicon solar cells has developed rapidly in recent years. It is precisely because of the rapid development of the photovoltaic industry that the domestic solar silicon module production capacity is seriously overcapacitated. In addition, European and American countries have launched anti-infringement sales of photovoltaic modules produced in China, which has caused a large number of domestic photovoltaic companies to severely compress the production profits and reduce production. Cost has become an important means of b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B1/16H01B13/00H01L31/0224
Inventor 宋财根郑刚程遵义樊季周张莉娜
Owner NINGBO GUANGBO NEW NANOMATERIALS STOCK
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