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Thick Film Pastes for Front Side Metallization in Silicon Solar Cells

A technology of solar cells and rare earth metals, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, metal/alloy conductors, circuits, etc. Major and other issues

Active Publication Date: 2022-05-27
ZHEJIANG KAIYING NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the weight percentage of glass frit used as a high-temperature adhesive is increased to increase the adhesion strength, the contact resistance of the conductor is also increased resulting in a concomitant decrease in fill factor (FF) and conversion efficiency for solar cells, so It is also challenging to achieve high pull-out strength
Furthermore, increasing the amount of one of the main glass network formers such as lead oxide will degrade the quality of the p-n junction, which reduces the conversion efficiency
It is also undesirable to increase the amount of metallization paste printed to increase the final pull strength of the fired conductor because of the increased material cost
[0005] Silver metallization pastes comprising glass frits formed using various metal oxides such as disclosed in U.S. Application Publication No. 2015 / 0364622 exhibit no Improved electrical properties

Method used

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  • Thick Film Pastes for Front Side Metallization in Silicon Solar Cells
  • Thick Film Pastes for Front Side Metallization in Silicon Solar Cells
  • Thick Film Pastes for Front Side Metallization in Silicon Solar Cells

Examples

Experimental program
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Effect test

example 1

[0134] Glass frits made from rare earth metal oxides

[0135] Glass frits with the compositions listed in Table 1 were formed.

[0136] Table 1 Glass frit

[0137]

[0138] 1 The divalent lead oxide was from Alfa Aesar, product number 12220.

[0139] 2 Tetravalent tellurium oxide was obtained from Alfa Aesar, product number 87813.

[0140] 3 Trivalent bismuth oxide was obtained from Alfa Aesar, product number 44657.

[0141] 4 Hexavalent tungsten oxide was obtained from Alfa Aesar, product number 43344.

[0142] 5 The monovalent cupric oxide was from Alfa Aesar, product number 40188.

[0143] 6 Lanthanum trivalent oxide was obtained from Alfa Aesar, product number 41644.

[0144] 7 Trivalent yttrium oxide was obtained from Alfa Aesar, product number 44286.

[0145] The metal oxide group is mixed and heated to a temperature of 800°C to 1300°C to melt the oxides. Cool the glass to room temperature. The glass is then ground to provide a fine glass frit particl...

example 2

[0147] contains La 2 O 3 or Y 2 O 3 metallization paste for glass frit

[0148] Metallization pastes were prepared containing glass frits with various amounts of metal oxide La 2 O 3 or Y 2 O 3 . The nominal contents of the metallization pastes are shown in Table 2.

[0149] Table 2 Metallization paste

[0150]

[0151]

[0152] 1.0wt% ETHOCEL TM Ethyl cellulose (STD4, The Dow Chemical Company) organic binder dissolved in 6.69 wt% Texanol at 60 °C TM (Texanol TM alcohol ester, Eastman Chemical Company), and 89 wt % spherical silver particles (AG-4-8, Tonghe High-Tech Co., Ltd.) having an average particle diameter of 2.0 μm, Example 1 having an average particle diameter of 1.0 μm and 2.5wt% glass frit with 350°C transition temperature Tg, with 200±25m 2 / g BET specific surface area of ​​0.01 wt% fumed silica ( 200, Evonik Co., Ltd.), 0.4wt% dispersant ( 102, BYK) and 0.4wt% thixotropic agent ( ST, Hemings Co., Ltd.) was added to the binder solution...

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Abstract

Front side metallization pastes for solar cell electrodes prepared from glass frits containing rare earth metals such as lanthanum and yttrium are disclosed. Electrodes prepared from the metallization paste exhibit improved adhesion, reliability, and excellent electrical properties.

Description

technical field [0001] Screen printable thick film pastes for use in making front side contacts for photovoltaic devices are disclosed, and more particularly screen printable for use in silicon solar cells requiring fine line front side contacts are disclosed thick film paste. Thick film pastes include silver particles or other metal sources, and lead-tellurium-bismuth-tungsten glass frits containing lanthanum and / or yttrium dispersed in an organic medium. Background technique [0002] Solar cells that convert sunlight into electricity are usually made of semiconductor materials. Conventional silicon solar cells are typically fabricated from thin wafers of substantially p-type base silicon (Si) with a cathode electrode on the front or sun-facing side and an anode electrode on the backside. Alternatively, an n-type Si wafer can be used, eg, a boron emitter is used for doping in the front side tuned to p-type, and the p-n junction can be made by diffusing phosphorus (P) from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22C03C12/00
CPCY02E10/549C03C3/122C03C8/16C03C8/18C03C8/24C03C8/10H01B1/02H01B1/22H10K30/81H10K71/30C03C4/04H01L31/022425H01L31/0264
Inventor 穆罕默德·M·西拉理韦继锋
Owner ZHEJIANG KAIYING NEW MATERIAL