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

A technology of silicon solar cells and back electrodes, applied in cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems such as insufficient welding tension

Inactive Publication Date: 2017-06-06
KANGZHUN ELECTRONICS TECH KUNSHAN +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing back electrode silver paste usually has insufficient soldering tension (the highest is usually only 3 Newtons)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] (a) Preparation of organic vehicle

[0045] The organic carrier raw materials are prepared according to the above-mentioned ingredients and proportioning relationship, mixed and heated to a temperature of 80-120° C., stirred until the resin is dissolved, and the solution becomes a uniform liquid, thereby obtaining the organic carrier.

[0046] (b) Preparation of back electrode silver paste

[0047] Mix and stir the silver powder, inorganic glass phase and organic carrier according to the above-mentioned ingredients and proportioning relationship, and then use a three-roll mill to grind with a roll distance of 40-100 μm and a grinding frequency of 5-10 times to obtain a uniformly dispersed back electrode Silver paste. Wherein, the fineness of the back electrode silver paste is less than 10 μm, and the viscosity is 20000-50000 mpa·s.

[0048] Print the back electrode silver paste on a 156mm×156mm polysilicon wafer using a 290-mesh screen, and then undergo rapid heat tre...

Embodiment 1

[0051] (1) Preparation of organic carrier:

[0052] Ethyl cellulose: 15%;

[0053] Terpineol: 77%;

[0054] Silicone oil: 1%;

[0055] Diethylene glycol butyl ether acetate: 5%;

[0056] Span: 1%;

[0057] Polyamide wax: 1%.

[0058] The above ingredients and the organic carrier raw materials in mass percentage are mixed, heated to 80-120° C., stirred until the resin is dissolved to form a uniform solution, and the organic carrier is obtained.

[0059] (2) Preparation of silver paste for back electrode:

[0060] The configuration contains 27% by mass of Bi 2 o 3 , Al with a mass percentage of 38% 2 o 3 , SiO with a mass percentage of 20% 2 , ZnO with a mass percentage of 12%, and MnO with a mass percentage of 3% 2 inorganic glass phase. Weigh silver powder with a mass percentage of 50%, the above-mentioned inorganic glass phase with a mass percentage of 3%, and an organic vehicle with a mass percentage of 47%, mix and stir evenly, and then grind in a three-roll mill ...

Embodiment 2

[0065] (1) Preparation of organic carrier:

[0066] Ethyl cellulose: 17%;

[0067] Diethylene glycol butyl ether: 74.5%;

[0068] Silicone oil: 1%;

[0069] Tributyl citrate: 5%;

[0070] Lecithin: 0.5%;

[0071] Hydrogenated Castor Oil: 2%.

[0072] The above ingredients and the organic carrier raw materials in mass percentage are mixed, heated to 80-120° C., stirred until the resin is dissolved to form a uniform solution, and the organic carrier is obtained.

[0073] (2) Preparation of silver paste for back electrode:

[0074] The configuration contains 24% Bi by mass 2 o 3 , Al with a mass percentage of 38% 2 o 3 , SiO with a mass percentage of 20% 2 , ZnO with a mass percentage of 17%, and SbO with a mass percentage of 1% 2 inorganic glass phase. Weighing the silver powder with a mass percentage of 55%, the above-mentioned inorganic glass phase with a mass percentage of 3.5%, and an organic vehicle with a mass percentage of 41.5% are mixed to prepare a mixture,...

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Abstract

The invention discloses a back electrode silver paste for a silicon solar cell, and the silver paste contains the following components by mass percentage: 39%-60% of silver powder, 1%-5% of inorganic glass phase, and 35%-60% of organic carrier. The inorganic glass phase comprises main glass phase and inorganic additives. The main glass phase comprises bismuth oxide, aluminium oxide and silicon oxide. The mass percentages of the components in the main glass phase are as follows: 10%-40% of bismuth oxide, 20%-60% of aluminium oxide and 10%-30% of silicon oxide. At least two of copper oxide, zinc oxide, titanium dioxide, manganese dioxide, antimony oxide, magnesium oxide, stannic oxide, lithium oxide and nickel oxide are selected as the inorganic additives. The invention also provides a preparation method for the back electrode silver paste.

Description

technical field [0001] The invention relates to a back electrode silver paste for a silicon solar cell and a preparation method thereof. Background technique [0002] As an important clean energy source, silicon solar cells have shown a rapid growth trend in recent years, and the demand for conductive paste, one of the important consumables of silicon solar cells, is also increasing. The conductive paste for silicon solar cells mainly includes positive electrode silver paste, back electrode silver paste and back electrode aluminum paste. The back electrode silver paste is formed by rolling silver powder, inorganic glass phase and organic carrier. The back electrode silver paste is usually coated on the back of the silicon cell by screen printing technology, and then the back silver electrode is formed on the back of the solar cell silicon by rapid thermal treatment (RTP, Rapid Temperature Process) in a tunnel furnace. The silicon-silver layer formed during the heat treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224H01B13/00
CPCH01L31/022425H01B1/22Y02E10/50
Inventor 张新倍陈文荣张顾耀许迪赵学全王登何松松柯超
Owner KANGZHUN ELECTRONICS TECH KUNSHAN
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