Crystal silicon solar cell aluminum paste with high conductivity

A solar cell, high-conductivity technology, applied in conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve problems such as poor appearance and boiling performance of aluminum films, and achieve reduced warpage, humidity and heat resistance. Good performance and good compatibility

Inactive Publication Date: 2016-01-06
JIANGSU HOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to use aluminum powder with an oxygen content lower than 0.4% as the conductive phase to improve the electrical properties of the back electrode of the solar cell, further improve the photoelectric conversion efficiency of the back aluminum paste on the market, and solve the problem of the aluminum film caused by it at the same time. Technical problems with poor appearance and poaching performance

Method used

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  • Crystal silicon solar cell aluminum paste with high conductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The formulation components of the high-conductivity crystalline silicon solar cell aluminum paste include, by weight percentage: 65% of aluminum powder, 1% of lead-free glass powder, 30% of organic vehicle, 3% of anti-warping additive and 1% of auxiliary agent.

[0023] Among them, aluminum powder specifications: oxygen content 0.2%. Based on the total weight of aluminum powder, the particle size mix is: 30% aluminum powder A of less than 2 μm, 30% B of 3-5 μm aluminum powder and 40% of C 6-8 μm aluminum powder. The lead-free glass powder components include by weight percentage: Bi 2 o 3 30%, B 2 o 3 20%, SiO 2 8%, ZnO30%, Sb 2 o 3 6.4%, ZrO 2 0%, V 2 o 5 5%, Al 2 o 3 0.5%, BaO0.1% and SrO0%.

[0024] The organic vehicle components include by weight percentage: ethyl cellulose 7%, cellulose acetate butyrate 5%, phenolic resin 5%, terpineol 41%, butyl carbitol acetate 18.7%, tributyl citrate 16% ester, 4% diethylene glycol butyl ether, 3% pump oil and 0.3% w...

Embodiment 2

[0026] 70% aluminum powder, 3.5% lead-free glass powder, 24.4% organic vehicle, 2% anti-warping additive and 0.1% additive.

[0027] Among them, aluminum powder specification: oxygen content is 0.25%. Based on the total weight of aluminum powder, the particle size mix is: 10% of aluminum powder less than 2μm, B80% of 3-5μm aluminum powder and 10% of 6-8μm aluminum powder C. The lead-free glass powder components include by weight percentage: Bi 2 o 3 40%, B 2 o 3 13%, SiO 2 15%, ZnO10%, Sb 2 o 3 10%, ZrO 2 1%, V 2 o 5 3%, Al 2 o 3 5%, BaO2% and SrO1%.

[0028] The formulation components and percentages of the organic vehicle are the same as in Example 1; anti-warping additive: ThP 2 o 7 and UP 2 o 7 Equal mass mixing, and surface treatment by borate coupling agent; additives are composed of sodium polydimethylcarboxylate, cetylpyridine, dipalmitoyl ethylenediamine and modified urea thixotropic agent.

Embodiment 3

[0030] Aluminum powder 75%, lead-free glass powder 5%, organic vehicle 17.5%, anti-warping additive 0.5% and auxiliary agent 2%.

[0031] Among them, aluminum powder specification: oxygen content is 0.30%. Based on the total weight of aluminum powder, the particle size mix is: 20% of aluminum powder A of less than 2 μm, 70% of B of 3-5 μm aluminum powder and 10% of C of 6-8 μm aluminum powder. The lead-free glass powder components include by weight percentage: Bi 2 o 3 50%, B 2 o 3 10%, SiO 2 12%, ZnO14.5%, Sb 2 o 3 5%, ZrO 2 3%, V 2 o 5 1%, Al 2 o 3 3%, BaO1%, SrO0.5%.

[0032] The formulation components and percentages of the organic vehicle are the same as in Example 1; anti-warping additive: HfW 2 o 8 , surface treated with polyvinylpyrrolidone; additives consist of dioctyl sodium adipate, sodium stearate, polyether defoamer and polyamide wax micropowder.

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Abstract

The invention discloses crystal silicon solar cell aluminum paste with high conductivity. The crystal silicon solar cell aluminum paste comprises the following formula components in percentage by weight: 65%-78% of aluminum powder, 1%-5% of lead-free glass powder, 15%-30% of an inorganic carrier, 0.5%-3% of a warp-resistant additive and 0.1%-3% of an assistant, wherein the oxygen content of the aluminum powder is less than 0.4% in percentage by weight. After the solar cell aluminum paste prepared from the formula components is subjected to silk-screen printing and high-temperature sintering, the open-circuit voltage can be improved; and the photoelectric conversion efficiency of a cell slice is improved. Meanwhile, the solar cell slice is good in appearance; and an aluminum film is smooth, does not generate an alumina bead or an aluminum bract, is small in warping degree and good in boiling resistance, and completely conforms to the requirements on the crystal silicon solar cell aluminum paste on the market.

Description

technical field [0001] The invention relates to an aluminum paste for a crystalline silicon solar cell, in particular to an aluminum paste for a crystalline silicon solar cell with high conductivity. Background technique [0002] A crystalline silicon solar cell is a semiconductor device that converts light energy directly into electrical energy. P-type silicon solar cells usually need to print aluminum conductive paste on the back of the silicon substrate, and then dry and sinter the process to make the aluminum atoms diffuse into the silicon body to form a p-p+ junction. The existence of the aluminum back field can reduce the electron density. And the recombination rate of holes at the interface, increasing the lifetime of carriers, increasing the red light effect, thereby increasing the open circuit voltage and short circuit current of the battery. When forming an aluminum back field, aluminum can also form a silicon-aluminum alloy with silicon. This silicon-aluminum all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 陈晓蕾杨波杨贵忠管寿安仲伟兰
Owner JIANGSU HOYI TECH
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