Lead-free composite glass adhesive solar battery positive silver paste

A solar cell and composite glass technology, applied in the direction of conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problem of inorganic binders and pastes that have not proposed high conversion efficiency lead-free front silver pastes Material preparation technology and other issues

Active Publication Date: 2015-10-14
武汉硕美特电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above documents and existing patents only involve the improvement of the leaded glass binder and printing performance of the front silver paste, but none of them propose the inorganic binder and paste of the lead-free front silver paste with high conversion efficiency Preparation technology, the purpose of the present invention is to produce an environment-friendly front silver paste with high conversion efficiency and good adhesion through the formulation design of the lead-free glass binder of the front silver paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] A lead-free composite glass binder solar cell front silver paste (prepared 100g), its production process is as follows:

[0088] 1. Composite glass binder formula (prepared 100g): SiO 2 10g, TeO 2 30g, GeO 2 10g, Bi 2 o 3 30g,Al 2 o 3 3g, ZnO 5g, TiO 2 2g, La 2 o 3 3g, CaO 2g, Li 2 o 3g, P 2 o 5 2g.

[0089] 2. Glass melting and ball milling process: 1100°C, 60min, after quenching, ball mill until the glass D90 particle size is less than 5μm.

[0090] 3. Metal silver powder is spherical powder with D50 of 2.0um.

[0091] 4. Organic carrier preparation. Terpineol 5g, DBE 3g, diethylene glycol butyl ether 2g, ethyl cellulose 3g, rosin resin 1g, and heat treatment at 80-100°C to fully dissolve and mix.

[0092] 5. Slurry preparation: 86g of metallic silver powder, 4g of composite glass binder, 9g of organic carrier, 1g of organic additive, and stir and disperse evenly in the container, then perform three-roll grinding to control th...

Embodiment 2

[0101] A lead-free composite glass binder solar cell front silver paste (prepared 100g), its production process is as follows:

[0102] 1. Composite glass binder formula (prepared 100g): SiO 2 5g, TeO 2 50g, GeO 2 5g, Bi 2 o 3 20g, Al 2 o 3 2g, ZnO 3g, TiO 2 5g, Er 2 o 3 2g, SrO 2g, Li 2 O 1g, P 2 o 5 5g.

[0103] 2. Glass melting and ball milling process: 1000°C, 60 minutes, after quenching, ball mill until the glass D90 particle size is less than 5μm.

[0104] 3. Metal silver powder is spherical powder with D50 of 1.6um.

[0105] 4. Organic carrier preparation. Terpineol 2g, DBE 6g, diethylene glycol butyl ether 2g, ethyl cellulose 2g, rosin resin 2g, and heat treatment at 80-100°C to fully dissolve and mix.

[0106] 5. Slurry preparation: 85g of metallic silver powder, 5g of composite glass binder, 9g of organic carrier, 1g of organic additive, and stir and disperse evenly in the container, then perform three-roll grinding to contr...

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PUM

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Abstract

The invention relates to the formulation and the preparation method of a lead-free composite glass adhesive solar battery positive silver paste. A lead-free glass adhesive is designed. The positive silver paste made of the lead-free glass adhesive is an environment-friendly material. A crystalline silicon solar battery made of the positive silver paste has the advantages of high conversion efficiency and strong electrode adhesion. According to the lead-free glass adhesive, a silicon (Si)-tellurium (Te)-germanium (Ge) composite glass material is used; Bi2O3, Al2O3, ZnO, a transition metal oxide, an rare earth metal oxide, an alkaline earth metal oxide and the like are added; the composite glass adhesive can quickly dissolve and precipitate silver grains in a battery sintering process; a good conductive path is formed between a silver thick film electrode and an emitting area n-Si; Ag-Si ohmic contact is formed; the series resistance of the battery is reduced; the conversion efficiency of the battery is improved; and through the composite glass adhesive, firm adhesion of a silver electrode and a silicon substrate is generated, and a positive silver electrode has strong adhesion.

Description

technical field [0001] The invention relates to a lead-free composite glass adhesive and the use of the glass adhesive to prepare front silver paste for silicon solar cells. The front silver paste is used for screen printing to make crystalline silicon solar cells. Silicon solar cells made of materials have higher conversion efficiency. Background technique [0002] Metallization is the key technology of crystalline silicon solar cells. The metallization of crystalline silicon solar cells includes front grid electrodes, back aluminum back field and back silver electrodes. Among them, the front grid electrode is particularly important, which will directly affect the photoelectric performance of the solar cell such as conversion efficiency, series resistance, and fill factor. Front side metallization technologies for crystalline silicon solar cells usually include: nickel plating + screen printing silver electrodes, direct screen printing silver electrodes, inkjet silver elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/16H01L31/0224
Inventor 付天舒范琳陈栋
Owner 武汉硕美特电子材料有限公司
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