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Conductive metal paste for a metal-wrap-through silicon solar cell

A technology of conductive metal and paste, applied to conductive materials, metal/alloy conductors, circuits, etc. dispersed in non-conductive inorganic materials, can solve the problems of reducing the effective photosensitive area and reducing the performance of solar cells

Inactive Publication Date: 2014-07-30
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The front-side electrodes of conventional solar cells reduce the effective light-sensing area available on the front-side of the solar cell, thereby reducing the performance of the solar cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0040] This example was carried out to prepare the conductive metal paste of the present invention using the following components in parts by weight as shown below:

[0041] 8.0 parts organic vehicle (ethylcellulose dissolved in solvent), wherein ethylcellulose accounts for the solution

[0042] about 10% by weight of the total weight of

[0043] 2.0 parts of terpineol;

[0044] 0.75 parts for slurry rheological properties (obtained from Rheox, Inc., Hightstown, N.J.);

[0045] 0.2 parts Butylated Hydroxytoluene Ionol (available from PMC Specialties Group, Cincinnati, Ohio);

[0046] 5 parts of a solution comprising 85% by weight of phosphoric acid;

[0047] 80.5 silver dust;

[0048] 0.2 parts caprylyl titanate, titanium resinate sintering inhibitor (obtained from Tioxide Specialties Ltd.)

[0049] Mix all ingredients except the silver powder in a mixing tank for a few minutes. The glass frit and silver powder were then added and mixing continued for an additional 15 ...

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PUM

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Abstract

A conductive metal via paste comprising particulate conductive metal, a reactant that reacts at temperatures of 600 DEG C to 900 DEG C with at least one of the group consisting of Si, SiO2 and SiNx to form an insulating glass, and an organic vehicle is particularly useful in providing the metallization of the holes in the silicon wafers of MWT solar cells. The result is a metallic electrically conductive via between the collector lines on the front side and the emitter electrode on the back-side of the solar cell. The paste can also be used to form the collector lines on the front-side of the solar cell and the emitter electrode on the back-side of the solar cell. Also disclosed are metal-wrap-through silicon solar cells comprising the fired conductive metal paste.

Description

technical field [0001] The present invention relates to a conductive metal paste for metal-wrap-through (MWT) silicon solar cells and a corresponding MWT silicon solar cell made using said conductive metal paste. Background technique [0002] A conventional solar cell with a p-type (p-doped) silicon substrate has an n-type (n-doped) emitter in the form of an n-type diffused layer on its front side. This conventional silicon solar cell structure uses a negative electrode to contact the front, or illuminated, side of the cell, and a positive electrode on the back. It is well known that radiation of suitable wavelength incident on the p-n junction of semiconductors acts as an external energy source for the generation of electron-hole pairs. The potential difference that exists at the p-n junction causes holes and electrons to move across the junction in opposite directions, creating a current capable of delivering power to an external circuit. Most solar cells are in the form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/02B05D5/12
CPCH01B1/22H01L31/02245Y02E10/50
Inventor A·F·卡罗尔Y·王
Owner EI DU PONT DE NEMOURS & CO