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Glass frit for silicon solar cell paste and its preparation method and paste

A silicon solar cell and glass frit technology, applied in the field of solar cells, can solve the problems of insufficient adhesion, insufficient adhesion, over-soldering, etc., and achieve the effect of enhancing welding resistance and improving welding adhesion.

Active Publication Date: 2020-07-14
CHANGZHOU JUHE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of welding the metal ribbon to the paste, it will often cause over-welding. In this case, the adhesion is naturally insufficient.
Even if there is no obvious over-soldering, the adhesion is often not up to the requirement

Method used

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  • Glass frit for silicon solar cell paste and its preparation method and paste
  • Glass frit for silicon solar cell paste and its preparation method and paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 (preparation of glass frit and comparative example)

[0014] Dosing according to the glass frit ratio (mass fraction) in Table 1 and Table 2, use a muffle furnace to melt the glass raw materials at 1100°C for 1 hour, after fully homogenizing, use a water-cooled counter-roller discharger for glass the quenching process. Afterwards, the glass is ball milled using a planetary ball mill to obtain powdered glass frit of suitable particle size. The particle size distribution D50 of the obtained glass frit is ≤ 2 μm.

[0015] Included in the following table 1 are 10 example samples, G1-A, G2-A, G3-A, G4-A, G5-A, G6-A, G7-A, G8-A, G9-A and G10-A And 10 comparative samples G1-B, G2-B, G3-B, G4-B, G5-B, G6-B, G7-B, G8-B, G9-AB and G10-B.

[0016] Table 1

[0017] PbO B 2 o 3

ZnO SiO 2

Al 2 o 3

MgO CuO G1-A 10 15 10 5 5 5 50 G1-B 10 30 20 15 15 10 0 G2-A 40 7 5 3 5 0 40 G2-B 40 20 2...

Embodiment 2

[0025] Fully mix 87wt% conductive silver powder, 2wt% G1-A glass frit, and 11wt% organic medium, use a three-roll mill to grind the slurry, and use a scraper fineness tester to test the grinding fineness. The slurry grinding fineness is below 6 μm. The prepared slurry was named P1-A.

Embodiment 3

[0027] Fully mix 88wt% conductive silver powder, 2wt% G2-A glass frit, and 10wt% organic medium, use a three-roll mill to grind the slurry, and use a scraper fineness tester to test the grinding fineness. The slurry grinding fineness is below 6 μm. The resulting slurry was named P2-A.

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Abstract

The invention discloses a glass material for silicon solar cell slurry, a preparation method of the glass material and the solar cell conductive slurry containing the glass material. The glass material is prepared from 5-89 wt% of bismuth oxide and / or lead oxide, 5-89 wt% of oxide and 6-50 wt% of antiflux, wherein the antiflux is oxides formed by copper, tungsten and other metal with weaker activity than bismuth / lead or any mixture of the oxides, and the oxides are selectively selected from one of or the mixture of some of glass network generation bodies, network intermediate oxides or network external body oxides. The conductive slurry prepared from the glass material has good antiflux capacity and remarkable in technical effect, and the welding adhesion force of the conductive slurry for a substrate can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a glass frit of conductive paste for silicon solar cells. Background technique [0002] Silicon solar cells are developing rapidly as a new energy technology. Most of the currently used silicon solar cells use conductive paste as an important means of cell metallization. In layman's terms, a layer of grid-shaped paste is printed on the front or back of the silicon wafer, and the paste is bonded to the silicon wafer through sintering, and the metal ribbon can be welded on the paste to form an external metal front. Negative pole (metal contact point). This not only requires the paste to have good electrical properties, but also must have good soldering adhesion to the substrate, so that the metal ribbon can be firmly bonded to the silicon chip. In this process, the glass frit (or glass binder) in the paste plays a crucial role. The composition and properties of the glass fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C12/00H01L31/0224H01B1/16H01B1/22
CPCC03C12/00H01B1/16H01B1/22H01L31/022425Y02E10/50
Inventor 熊长军敖毅伟郑建华任益超李宏伟凃小平李佳峰
Owner CHANGZHOU JUHE NEW MATERIAL CO LTD
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