Lead-free aluminum paste for solar cell and preparation method thereof

A technology for solar cells and aluminum backing, applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve problems such as low conversion efficiency, affecting the overall performance of cells, and high contact resistance. Increased open circuit voltage and conversion efficiency, improved battery conversion efficiency, and reduced warpage

Inactive Publication Date: 2013-06-26
ZHEJIANG YUHUI SOLAR ENERGY SOURCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The printability is not good, and the phenomenon of network blocking and dry network is easy to appear during the printing process; after sintering, the contact resistance with the silicon wafer is high, and aluminum beads and aluminum packets are easy to be produced. Usually, the conversion efficiency of the cell is 12% to 15%. The conversion efficiency is low, the open circuit voltage is only about 0.5V, and the warpage of the cell is as high as 1.8mm, which seriously affects the overall performance of the cell

Method used

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  • Lead-free aluminum paste for solar cell and preparation method thereof
  • Lead-free aluminum paste for solar cell and preparation method thereof
  • Lead-free aluminum paste for solar cell and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a method for preparing the above-mentioned lead-free back aluminum paste for solar cells, comprising the following steps:

[0034] 1) According to the mass percentage, 55% ~ 70% Bi 2 o 3 , 15%~30%B 2 o 3 , 2% ~ 8% ZnO, 3% ~ 7% Al 2 o 3 , 5% ~ 10% SiO 2Mix with 0.5%~2% InO evenly, the sum of the mass percentage of each component is 100%; the above mixture is melted, cooled, ball milled and sieved to obtain lead-free glass powder, particle size range of lead-free glass powder: 0.5μm~ 3.0μm, softening point 400℃~600℃, expansion coefficient: 58×10 -7 / K~70×10 -7 / K;

[0035] 2) Add 5% to 10% of ethyl cellulose resin and 3% to 10% of acrylic resin to 80% to 92% of butyl carbitol acetate, butyl carbitol, pine In a mixture of one or more of oleyl alcohol and lauryl alcohol, the sum of the mass percentages of each component is 100%; it is completely dissolved at a constant temperature of 80°C, and is filtered through a 250-mesh stand...

Embodiment 1

[0048] 1) Preparation of lead-free glass powder

[0049] 55% Bi by mass percentage 2 o 3 , 24%B 2 o 3 , 6% ZnO, 4% Al 2 o 3 , 10% SiO2 2 After mixing evenly with 1% InO, heat it to 1000°C and keep it warm for 2 hours, then cool the glass powder, ball mill it until the particle size of the lead-free glass powder is 0.5 μm to 3.0 μm, and filter it through a 325-mesh standard sieve for use. At this time, the softening point of the lead-free glass powder is 400℃~600℃, and the expansion coefficient: 58×10 -7 / K~70×10 -7 / K.

[0050] 2) Preparation of organic vehicle

[0051] Add 10% ethyl cellulose resin and 10% acrylic acid resin to 80% terpineol diluent according to mass percentage, and dissolve completely under constant temperature conditions of 80°C. Organic vehicle was obtained by filtration.

[0052] 3) Preparation of slurry

[0053] 0.5% of the above-mentioned lead-free glass powder, 10% of the above-mentioned organic vehicle, 80% of the fine spherical aluminum p...

Embodiment 2

[0057] 1) Preparation of lead-free glass powder

[0058] By mass percentage will 58.5% Bi 2 o 3 , 30%B 2 o 3 , 2% ZnO, 3% Al 2 o 3 , 6% SiO 2 After mixing evenly with 0.5% InO, heat it to 950°C and keep it warm for 2 hours, then cool the glass powder, ball mill it until the particle size of the lead-free glass powder is 0.5 μm to 3.0 μm, and filter it through a 400-mesh standard sieve for use. At this time, the softening point of the lead-free glass powder is 400℃~600℃, and the expansion coefficient: 58×10 -7 / K~70×10 -7 / K.

[0059] 2) Preparation of organic vehicle

[0060] Add 8% ethyl cellulose resin and 5% acrylic resin to the diluent composed of 40% butyl carbitol, 30% terpineol and 17% lauryl alcohol by mass percentage, and keep the temperature at 80°C Under the conditions, it was completely dissolved, and after 2 hours of heat preservation, the organic carrier was obtained by filtering with a 250-mesh standard sieve.

[0061] 3) Preparation of slurry

[006...

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Abstract

The invention discloses a lead-free aluminum paste for a solar cell and a preparation method thereof. The lead-free aluminum paste comprises, by weight, 0.5%-3% of lead-free glass powder, 65%-80% of fine spherical aluminum powder, 10%-28% of an organic vehicle, 4%-10% of a solvent, 1%-3% of a plasticizer, 0.3%-1% of a dispensing agent and 0.1%-1% of an inorganic additive. The invention further discloses a preparation method of the lead-free aluminum paste for the solar cell. According to the lead-free aluminum paste for the solar cell and the preparation method thereof, the excellent printability is provided, and mesh clogging and mesh drying in the printing process can be avoided; and the lead-free aluminum paste forms good ohmic contact with silicon chips after sintering, aluminum beads and aluminum blisters can be avoided, the warp degree of the cell is reduced, and the open-circuit voltage and the conversion efficiency are increased.

Description

technical field [0001] The invention relates to the technical field of electronic material equipment, in particular to a lead-free back aluminum paste for solar cells and a preparation method thereof. Background technique [0002] With the deepening of people's understanding of the energy crisis in recent years, the whole world has turned its attention to renewable energy, hoping that renewable energy can change the energy structure of mankind and maintain long-term sustainable development. Among them, solar energy has become the focus of people's attention due to its unique advantages. Solar photovoltaic power generation technology, as the most significant technology in the utilization of solar energy, has become a hotspot in the research and application of countries all over the world. As a result, the demand for solar cells in the world has increased year by year in the last three years, from 7.9GWp in 2008 to 9.86GWp in 2009, and then to 20.5GWp in 2010. [0003] In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 陈春锦
Owner ZHEJIANG YUHUI SOLAR ENERGY SOURCE
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