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Solar cell conductive paste and preparation method thereof

A technology for solar cells and conductive pastes, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of low safety, adhesion effect of leaking silicon substrate, complicated glass powder manufacturing process, etc. Good focus, no scarring effect

Inactive Publication Date: 2012-06-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is that the conductive paste used in solar cells in the prior art tends to leak through the screen during screen printing and has poor adhesion to silicon substrates. A new type of conductive paste for solar cells is specially provided
[0007] The technical problem to be solved by the present invention is the problem of complicated glass frit production process and low safety in the solar cell conductive paste in the prior art, and a new preparation method of the solar cell conductive paste is specially provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0033] Step 1: Configuration of organic carrier

[0034] Based on the total weight of the organic vehicle to be prepared, get 39 parts by weight of terpineol, 45 parts by weight of dibutyl phthalate (DBP), mix uniformly, and dissolve 16 parts by weight of ethyl cellulose In the above-mentioned mixed solvent, heat to 70°C to fully dissolve it, and stir evenly to obtain a uniform and clear organic vehicle A1.

[0035] Step 2: Preparation of Primary Oxide Powder

[0036] Get the primary bismuth oxide (D 50 0.5 μm), 15 parts by weight of primary boron trioxide (D 50 2.5 μm), 8 parts by weight of primary silica (D 50 2.0 μm), 6 parts by weight of primary zinc oxide (D 50 1.5 μm), 1 part by weight of primary alumina (D 50 3.2 μm), added to a high-speed V-type mixer and mixed for 20 minutes until uniform, to obtain a primary oxide mixture po...

Embodiment 2

[0043] This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0044] Step 1: Configuration of organic carrier

[0045] Same as Example 1.

[0046] Step 2: Preparation of Primary Oxide Powder

[0047] Get the primary bismuth oxide (D 50 10.0 μm), 15 parts by weight of primary boron trioxide (D 50 10.0 μm), 8 parts by weight of primary silica (D 50 7.5 μm), 6 parts by weight of primary zinc oxide (D 50 8.0 μm), 1 part by weight of primary alumina (D 50 9.6 μm), added to a high-speed V-type mixer and mixed for 20 minutes until uniform, to obtain a primary oxide mixture powder.

[0048] Step 3: Preparation of secondary oxide powder

[0049] 70 parts by weight of secondary silicon dioxide (median particle diameter D produced by SINONANO company 50 30nm), 30 parts by weight of secondary alumina (median particle size D produced by SINONANO company 50 45nm), added to a high-speed V-type mixer and mix...

Embodiment 3

[0054] This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0055] Step 1: Configuration of organic carrier

[0056] Same as Example 1.

[0057] Step 2: Preparation of Primary Oxide Powder

[0058] Get the primary lead oxide (D 50 6.5 μm), 20 parts by weight of primary boron trioxide (D 50 6.5 μm), 5 parts by weight of primary silica (D 50 3.0 μm), 3 parts by weight of primary zinc oxide (D 50 2.0 μm), 4 parts by weight of primary strontium oxide (D 50 2.0 μm), 2 parts by weight of primary calcium oxide (D 50 2.0 μm), 1 part by weight of primary alumina (D 50 3.2 μm), added to a high-speed V-type mixer and mixed for 20 minutes until uniform, to obtain a primary oxide mixture powder.

[0059] Step 3: Preparation of secondary oxide powder

[0060] 70 parts by weight of secondary silicon dioxide (median particle diameter D produced by SINONANO company 50 65nm), 30 parts by weight of secondary...

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Abstract

The invention discloses a solar cell conductive paste and a preparation method thereof. The solar cell conductive paste comprises conductive metal powder, a primary oxide, a secondary oxide and an organic carrier, wherein the median particle diameter D50 of the primary oxide is 0.5 to 10 mu m, and the median particle diameter D50 of the secondary oxide is 10 to 150 mu m. The provided solar cell conductive paste has the advantages of simple preparation technology, no net leakage phenomenon during screen printing, firm adhesion to a silicon substrate after sintering, no scar, high storage stability and difficult sedimentation and agglomeration.

Description

【Technical field】 [0001] The invention relates to a solar cell material, in particular to a solar cell conductive paste and a preparation method thereof. 【Background technique】 [0002] As a kind of green energy, solar energy has been paid more and more attention by people. In existing silicon-based solar cells, electrodes or back fields are generally prepared by printing conductive paste on a silicon substrate, drying and firing. The front electrode of the silicon substrate of a solar cell is generally a negative electrode, and the coated conductive paste is usually a conductive silver paste; the back electrode is generally a positive electrode, and the coated conductive paste is usually a conductive silver paste and a back field aluminum paste. Conductive paste has a great influence on the performance of solar cells. At present, the research on conductive paste mainly focuses on: (1) how to improve the photoelectric conversion efficiency of solar cells in terms of conduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01L31/18
CPCY02P70/50
Inventor 谭伟华刘珍周勇姜占锋
Owner BYD CO LTD
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