Silver electrocondution slurry for solar battery

A solar cell and conductive paste technology, which is applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problem of large ohmic resistance, unsatisfactory photoelectric conversion efficiency of solar cells, and silver conductive paste. Problems such as unsatisfactory adhesion

Inactive Publication Date: 2013-05-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems that the existing silver conductive paste has unsatisfactory adhesion on the surface of the silicon wafer, the ohmic resistance of the prepared solar cell is relatively large, and the photoelectric conversion efficiency of the solar cell is not ideal, the present invention provides an adhesive Strong, the ohmic resistance of the prepared solar cell sheet is small, and the photoelectric conversion efficiency of the solar cell sheet is higher. Silver conductive paste for solar cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh the raw materials according to the mass ratio (calculated in 100g):

[0025] Silver powder: 75g (52.5g spherical silver powder, D 50=1.2μm; flake silver powder 22.5g, D 50 =1.3μm) (the purity of silver powder is about 99.5%);

[0026] Aluminum powder: 3g (D 50 =5.3μm, the purity of aluminum powder is about 99%);

[0027] Lead oxide powder: 7g (D 50 =12.7μm, the purity of lead oxide powder is about 99.5%;

[0028] Organic vehicle: 15g (terpineol 3.5g, butyl carbitol 8g, ethyl cellulose 0.5g, epoxy resin 2.5g, dimethyl adipate 0.5g);

[0029] After initial mixing of all raw materials, grind them uniformly on a special three-roller mill to prepare front-side silver conductive paste for solar cells.

Embodiment 2

[0031] Weigh the raw materials according to the mass ratio (calculated in 100g):

[0032] Silver powder: 86g (55.9g spherical, D 50 =1.2μm; Flake 30.1g, D 50 =1.3μm) (the purity of silver powder is about 99.5%);

[0033] Aluminum powder: 2g (D 50 =5.3μm, the purity of aluminum powder is about 99%);

[0034] Lead oxide powder: 2g (D 50 =12.7μm, the purity of lead oxide powder is about 99.5%);

[0035] Organic vehicle: 10g (terpineol 2.5g, butyl carbitol 5g, ethyl cellulose 0.5g, epoxy resin 1.4g, dimethyl adipate 0.6g);

[0036] After preliminarily mixing all raw materials, grind them uniformly on a three-roll mill to obtain the front-side silver conductive paste for solar cells.

Embodiment 3

[0038] Weigh the raw materials according to the mass ratio (calculated in 100g):

[0039] Silver powder: 75g (52.5g spherical silver powder, D 50 =1.2μm; flake silver powder 22.5g, D 50 =1.3μm) (the purity of silver powder is about 99.5%);

[0040] Aluminum powder: 1.5g (D 50 =5.3μm, the purity of aluminum powder is about 99%);

[0041] Lead oxide powder: 7g (D 50 =12.7μm, the purity of lead oxide powder is about 99.5%);

[0042] Organic vehicle: 16.5g (terpineol 3.5g, butyl carbitol 9.5g, ethyl cellulose 0.5g, epoxy resin 2.5g, dimethyl adipate 0.5g);

[0043] After initial mixing of all raw materials, grind them uniformly on a special three-roller mill to prepare front-side silver conductive paste for solar cells.

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PUM

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Abstract

The invention provides silver electrocondution slurry for a solar battery. Based on the mass percentage content of the silver electrocondution slurry, the silver electrocondution slurry comprises, by mass, 74-86% of silver powder, 1-3% of aluminum powder, 2-8% of lead oxide powder, and 5-20% of organic carriers. The electrocondution slurry is strong in adhesive force, a prepared solar battery piece is small in ohmic resistance, and the solar battery piece is high in photon-to-current conversion efficiency. The silver electrocondution slurry for the solar battery lays a foundation for the further development of the solar energy. Meanwhile, material is simple and easy to obtain, so that compared with existing adhesion agent made of glass powder, the silver electrocondution slurry for the solar battery simplifies an adopted complicated process and reduces cost. Besides, the performance of the material, such as consistency, is easy to control, and the prepared electrocondution slurry is stable in performance.

Description

technical field [0001] The invention belongs to the photovoltaic field. Specifically, the present invention relates to a solar cell silver conductive paste and a preparation method thereof. Background technique [0002] As a kind of green energy, solar energy has attracted more and more attention due to its advantages of inexhaustibility, no pollution, and no limitation of geographical resources. [0003] The front electrode of the silicon substrate of a monocrystalline silicon solar cell is the negative electrode, and the back electrode is the positive electrode. Both the front electrode and the back electrode of the solar cell are coated with conductive paste. The front of the solar cell is generally printed with silver conductive paste to make 0.1 mm wide comb-shaped silver lines, and the back is usually made of conductive aluminum paste, which is printed as a full-area aluminum paste. Two gaps of 3 mm wide are left in the middle of the aluminum layer. A 4 mm wide silv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 王美艳舒剑周勇
Owner BYD CO LTD
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