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Full-aluminum backfield crystalline silicon solar cell back sliver paste, preparation method thereof and use thereof

A solar cell, all-aluminum back field technology, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of reducing the photoelectric conversion efficiency of the battery, reducing the minority carrier collection rate, reducing the open circuit voltage, etc., to improve the photoelectric conversion. Efficiency Eff, excellent dispersion, the effect of improving open circuit voltage

Active Publication Date: 2018-01-16
JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in conventional batteries using common silver paste on the back, due to the migration of silver ions, the interdiffusion of silver and aluminum is serious, which not only leads to poor solderability, but also makes the back silver paste area an ineffective recombination area, reducing the number of minority carriers. The collection rate of the battery reduces the open circuit voltage, which eventually leads to a decrease in the photoelectric conversion efficiency of the battery.

Method used

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  • Full-aluminum backfield crystalline silicon solar cell back sliver paste, preparation method thereof and use thereof
  • Full-aluminum backfield crystalline silicon solar cell back sliver paste, preparation method thereof and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A silver paste on the back of an all-aluminum back field crystalline silicon solar cell, the paste consists of the following components:

[0048] 12g spherical silver powder;

[0049] Flake silver powder 60g;

[0050] Glass powder 6g;

[0051] Calcium carbonate 3g;

[0052] Organic carrier 20g;

[0053] Wetting agent Tego Wet KL 245 0.1g;

[0054] Dispersant SN-5040 0.1g;

[0055] Leveling agent BYK-331 0.1g;

[0056] Dipoly rhodium acetate 0.05g.

[0057] Wherein, the average particle size of the spherical silver powder is 0.9 μm, D 50 0.9μm, tap density 6.5g / m 3 , The ablation rate is 0.3-0.8%.

[0058] Flake silver powder average particle size 2.5-5.0μm, D 50 3.1μm, tap density 4.0-6.0g / m 3 .

[0059]The glass powder is lead-free glass with a softening point of 700-750 o C, the average particle size is 3.5 μm.

[0060] Wetting agent, dispersant, leveling agent and adhesion promoter are used as processing aids as a whole, and the overall dosage is 0.2-0....

Embodiment 2

[0079] 1) Preparation of organic carrier: first weigh 20g of liquid solvent terpineol, 20g of butyl carbitol, 20g of butyl carbitol acetate, 20g of acetyl tributyl citrate, and 5g of dioctyl phthalate In a 250ml beaker, weigh 5g of polymer solid powder ethylcellulose, 4g of cellulose acetate butyrate, 2g of acrylic resin, and 4g of polyimide resin, and place the solid powder in a liquid mixed solvent at a temperature of 85 o Heat and stir in the constant temperature water tank of C until the resin is completely dissolved, then filter with a 300-mesh sieve to obtain an organic carrier, store it at a lower temperature, and keep it for later use;

[0080] 2) Preparation of slurry: weigh D 50 1.6μm, tap density 4.5g / m 3 20g of spherical silver powder, D 50 3.8μm, tap density 4.0g / m 3 40g of flaky silver powder with a softening point of 750 o C's lead-free glass powder 5.8g, calcium acetate 4g, organic vehicle 30g prepared above, wetting agent Tego Wet KL 245 0.05g, dispersant...

Embodiment 3

[0083] 1) Preparation of organic carrier: First weigh 15g of liquid solvent terpineol, 25g of butyl carbitol, 25g of butyl carbitol acetate, 15g of acetyl tributyl citrate, and 8g of dioctyl phthalate In a 250ml beaker, weigh 3g of polymer solid powder ethyl cellulose, 3g of cellulose acetate butyrate, 2g of acrylic resin, and 4g of polyimide resin, and place the solid powder in a liquid mixed solvent at a temperature of 80 o Heat and stir in the constant temperature water tank of C until the resin is completely dissolved, then filter with a 300-mesh sieve to obtain an organic carrier, store it at a lower temperature, and keep it for later use;

[0084] 2) Preparation of slurry: weigh D 50 1.2μm, tap density 5.3g / m 3 15.4g of spherical silver powder, D 50 3.5μm, tap density 4.8g / m 3 The flaky silver powder 55.1g, the softening point is 720 o 4g of lead-free glass powder of C, 3g of calcium oxalate, 22g of the organic vehicle prepared above, 0.1g of wetting agent Tego Wet ...

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Abstract

The present invention discloses a full-aluminum backfield crystalline silicon solar cell back sliver paste, a preparation method thereof and the use thereof. The sliver paste is mainly composed of 10-20 parts of spherical silver powder, 40-60 parts of silver flake, 3-6 parts of lead-free glass powder, 1-4 parts of aerdentalloy barrier agents, 20-30 parts of organic carriers and 0.2-0.5 parts of processing agents, and the preparation steps of the sliver paste comprise accurately weighing the materials in a container according to the formula parts by weight, firstly, mixing uniformly in a planetary centrifugal high-speed stirrer, then grinding and dispersing in a three-roller grinding machine to reach a fineness not more than 15 micrometers, thereby preparing the sliver paste. The sliver paste can be used to manufacture a solar cell back electrode, firstly, an aluminum paste is printed on the back side of a silicon wafer to manufacture a full-aluminum backfield, and then the back sliverpaste is printed. The sliver paste has a good welding performance and the high photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to a back silver paste for an all-aluminum back field crystalline silicon solar cell and a preparation method thereof, specifically belonging to the technical field of solar cell manufacturing materials. Background technique [0002] With the excessive exploitation and consumption of fossil energy (oil, coal, natural gas, etc.), the crisis of energy depletion and the greenhouse effect are becoming more and more serious, forcing human beings to urgently seek alternative new clean energy. For a long time in the future, the sun will become an effective provider of clean energy for human beings. It is predicted that by 2040 solar energy will account for 20% of the entire human energy structure, and by 2100 this proportion will reach 60%. Among them, solar power generation directly converts solar radiation into electrical energy, which is the most direct way to convert solar energy with the fewest conversion links among all clean ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01L31/0224
Inventor 闵玉勤张群李鹏张宇
Owner JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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