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Conductive slurry for solar battery front side electrode and production method thereof

A technology for solar cells and conductive pastes, applied in conductive coatings, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of low photoelectric conversion efficiency of solar cells, achieve high photoelectric conversion efficiency, improve adhesion The effect of the force and the flat surface of the electrode

Active Publication Date: 2008-10-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the defect of low photoelectric conversion efficiency of the solar cell prepared by using the conductive paste for the front electrode of the solar cell of the prior art, and provide a kind of solar cell front electrode that can make the solar cell have a higher photoelectric conversion efficiency. Conductive paste and preparation method thereof

Method used

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  • Conductive slurry for solar battery front side electrode and production method thereof
  • Conductive slurry for solar battery front side electrode and production method thereof
  • Conductive slurry for solar battery front side electrode and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1-5

[0036] The following examples illustrate the conductive paste provided by the present invention and its preparation method.

[0037] (1) Mix the organic carrier, surfactant and optional coupling agent, plasticizer, defoamer and solvent, stir until fully dissolved, and filter to remove the residue; (2) The mixture obtained in step (1) Add conductive metal powder, binder and additives, stir and mix uniformly to obtain conductive paste T1-T5 provided by the present invention.

[0038] Table 1 shows the amount of each substance used. Table 2 gives the composition of T1-T5.

Embodiment 6-10

[0047] The following examples illustrate the properties of the electroconductive pastes provided by the present invention.

[0048] The conductive paste T1-T5 that embodiment 1-5 obtains is that size is 125 millimeters * 125 millimeters, thickness is 270 ± 30 microns, and resistance is 0.5-3 ohm cm on the front side of the solar single silicon wafer with screen printing Machine (screen thickness 20 microns, 280 mesh, tension 30 Newtons) evenly screen-prints 45 grid lines with a width of 175 microns and 2 main lines with a width of 1.8 mm, and the printing thickness of the paste is 18-25 microns.

[0049] 74 parts by weight of aluminum powder, 0.4 parts by weight of diboron trioxide, 1 part by weight of lead oxide, 0.04 parts by weight of aluminum pentoxide, 0.46 parts by weight of silicon dioxide, 0.1 parts by weight of aluminum oxide, 0.96 parts by weight of ethyl Cellulose, 1.68 parts by weight of novolac epoxy resin, 0.24 parts by weight of rosin, 0.24 parts by weight of ca...

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Abstract

The invention relates to a conductive paste for the surface electrode of a solar cell, which comprises conductive metal powders, organic carriers, adhesives, solvents and addition agent, wherein, the conductive paste also comprises additives which are selected from phosphorus pentachloride and one or more VIII group metal halide. The additive in the conductive paste of the invention can help improve the adhesive force between the conductive paste and silicon substrate, and lead adhesion between compounds obtained after electrode sintering and silicon substrate to be more firm; the formed compound does not have cracks and bubbles and the electrode surface is flat and smooth, thus providing the solar cell finally prepared with higher photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to a conductive paste and a preparation method thereof, more specifically, the present invention relates to a conductive paste for a front electrode of a solar cell 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. [0004] The conductive paste on the front side of the solar cell is usually a conductive silver paste printed into a 0.1 mm wide comb-shaped silver line, and the back side is usually a conductive aluminum paste printed into a full-area aluminum paste, leaving tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/18H01B1/22C09D5/24C08L61/06C08L63/04C08L33/00C08L1/02C08K3/08
CPCY02P70/50
Inventor 杨璐周勇陈春山董俊卿
Owner BYD CO LTD
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