Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of back silver paste for crystalline silicon solar cell

A technology of solar cells and crystalline silicon, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., and can solve the problems of low conversion efficiency of cells

Inactive Publication Date: 2011-11-30
IRICO
View PDF3 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main design scheme of the present invention improves the phenomenon of screen blocking and dry screen that may occur during printing through suitable additives, organic carriers and solvents; through suitable glass system, silver powder and inorganic additives, the relationship between silver and silicon wafers and aluminum after sintering is improved. Contact resistance and low battery conversion efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A preparation method of back silver paste for crystalline silicon-based solar cell, it comprises the steps:

[0022] Step 1): Vector Preparation

[0023] Add ethyl cellulose resin to 70% to 95% of butyl carbitol ester, butyl carbitol acetate or terpineol according to 5% to 30% by weight or its ratio of 1:1 Or in a mixed solution of 1:1:2, dissolve completely in a constant temperature water tank at a temperature of 75°C to 95°C, and filter through a 250 to 325 mesh screen to obtain an organic carrier;

[0024] Step 2): Slurry Preparation

[0025] The weight percentage is 1.0%~5% lead-free glass powder, 56%~76% flake silver powder (tap density 4.0-6.0g / cm 3 ), 0.2-2% inorganic additives, 10%-30% organic vehicle prepared in step 1), 3%-12% solvent (same as the solvent in step 1)) and 0.1%-1% Plasticizer, 0.1-1% dispersant, mix them evenly in a planetary or other mixer, and then disperse them on a three-roller machine to below 20μm. Finally, filter through a 250-325 mes...

Embodiment 1

[0029] 1) Preparation of organic carrier: add 5% ethyl cellulose resin to 95% terpineol by weight percentage, heat to 75°C in a constant temperature water bath until completely dissolved, and filter through 250 mesh for later use;

[0030] 2) preparation of slurry: 3% glass powder, 70% flake silver powder, 0.2% Bi 2 o 3 , step 1) prepared 20% organic carrier, 5.8% terpineol solvent, 0.6% tri-n-butyl citrate, 0.4% BYK-111, they are mixed uniformly in planetary or other mixers, and then Disperse on a three-roll machine to a thickness below 20 μm, and finally filter through a 250-mesh screen to obtain an environmentally friendly silver paste with a viscosity of 90 kcps.

Embodiment 2

[0032] 1) Preparation of the organic carrier: add 10% ethyl cellulose resin to 90% butyl carbitol by weight percentage, heat to 85°C in a constant temperature water bath until completely dissolved, filter at 325 mesh for later use;

[0033] 2) Preparation of slurry: by weight percentage, the above-mentioned 1.0% glass powder, 76% flake silver powder, 0.8% ZrO 2 , 10% organic vehicle, 11.0% butyl carbitol, 0.2% acetyl tri-n-butyl citrate, 1% BYK-110, mix them evenly in a planetary or other mixer, and then mix them in a three-roller Disperse on the machine to below 20μm, and finally filter through a 325-mesh sieve to obtain an environmentally friendly silver paste with a viscosity of 80kcps.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a back silver paste for a crystalline silicon solar cell, which comprises the following steps: Step 1): preparing an organic vehicle: adding ethyl cellulose resin to a solvent in a constant temperature water bath After dissolving, the organic carrier is obtained by sieve filtration; step 2): preparation of back silver paste: 1.0-5.0% by weight of lead-free glass powder, 56.0-76.0% of flake silver powder, 0.2-2% of inorganic additives 1) Prepared 10%-30% organic vehicle, 3%-12% solvent, 0.1%-1% plasticizer and 0.1-1% dispersant are mixed evenly, and dispersed to 20 μm on a three-roll machine Hereinafter, the back silver paste for the crystalline silicon solar cell is obtained. The paste has excellent printability, good ohmic contact with silicon wafer and aluminum after sintering, good solderability, and high battery conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a preparation method of an environment-friendly crystalline silicon solar cell back silver paste. Background technique [0002] According to iSuppli, global photovoltaic solar installations surged by 39.3% in 2011, benefiting from strong demand in Italy and the United States. The only factor limiting this year's growth is the reduction of government incentives in some European countries. [0003] Although the growth rate of the PV market in 2011 is difficult to reach the high level of 120.5% last year, the global solar system installation will still maintain a healthy pace this year, increasing from 16.0GW in 2010 to 22.2GW. Germany will continue to be the world's largest in 2011. In the PV market, the installed capacity is estimated to reach 9.4GW, but Italy, which ranks second, is growing faster and may become one of the markets with the highest interna...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/22H01L31/0224
Inventor 陈春锦
Owner IRICO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com