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Method for preparing silicon-based solar front silver paste

A technology of solar energy and silver paste, which is applied in the fields of final product manufacturing, cable/conductor manufacturing, sustainable manufacturing/processing, etc., and can solve problems such as low contact resistance and battery conversion efficiency, low grid electrode height, and low battery conversion efficiency , to achieve the effects of high battery conversion efficiency, high height, and excellent printability

Inactive Publication Date: 2010-11-17
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the existing silver pastes, which are prone to blockage and dryness during printing, and the low conversion efficiency of the battery after sintering, and provide a front silver paste for silicon-based solar energy used in screen printing. Preparation
The main design of the present invention uses suitable additives, organic carriers and solvents to improve the phenomenon of screen blocking and dry screen that may occur during printing; through suitable glass systems, flake silver powder, nano-silver powder, and additives, the silver powder and silicon powder after sintering are improved. The problem of low grid line electrode height, low contact resistance and low battery conversion efficiency

Method used

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preparation example Construction

[0021] The invention discloses a method for preparing a front silver paste for silicon-based solar energy, which comprises the following steps:

[0022] (1) Preparation of glass powder:

[0023] A glass system, its composition and weight percentage are: 5% to 30% SiO 2 , 30% to 75% of PbO, 5% to 30% of B 2 o 3 、TiO 2 2%~15%, Al 2 o 3 0.5% to 10%. The above glass system components are uniformly mixed, melted, cooled, pulverized, ball milled, dried, and sieved through a sieve to obtain glass powder with an average particle size ranging from 0.4 μm to 1.2 μm.

[0024] (2) Preparation of organic carrier:

[0025] adding 10% to 30% by weight ethyl cellulose resin into 70% to 90% solvent, completely dissolving in a constant temperature water tank, and filtering through a 250 to 325 mesh screen to obtain an organic carrier;

[0026] (3) Preparation of slurry:

[0027] According to 0.5%-5% by weight, the above-mentioned glass powder, 40-85% flake silver powder, 5-45% nano-sil...

Embodiment 1

[0036] (1) prepare glass powder: by weight percentage with 5% SiO 2 , 75% PbO, 10% B 2 o 3 , 5% TiO 2 , 5% Al 2 o 3 After mixing evenly, heat it at 900°C for 30 minutes and melt it, then cut the glass powder cold, ball mill it for 48 hours, and filter it through a 400-mesh sieve for later use;

[0037] (2) Preparation of organic vehicle: add 10% ethyl cellulose resin to 90% butyl carbitol by weight percentage, heat to 75°C-95°C in a constant temperature water bath until completely dissolved, and filter through 250 mesh get organic carrier;

[0038] (3) Preparation of slurry: by weight percentage, the above-mentioned 0.5% glass powder, 40% flake silver powder, 45% nano-silver powder, 10% organic vehicle, 3.5% butyl carbitol solvent, 0.6% Dibutyl phthalate, 0.4% polyethylene wax dispersant, mix them evenly in a planetary or other mixer, then disperse them on a three-roll machine to below 10 μm, and finally filter them in a 325 mesh screen, use Brookfield The front silver ...

Embodiment 2

[0041] (1) prepare glass powder: make 10% SiO by weight percentage 2 , 65% PbO, 20% B 2 o 3 , 4% TiO 2 , 1% Al 2 o 3After mixing evenly, keep warm at 950°C for 30 minutes to melt, then cut the glass powder cold, ball mill for 48 hours, and filter through a 400-mesh sieve for later use;

[0042] (2) Preparation of organic vehicle: add 15% ethyl cellulose resin to 85% butyl carbitol acetate by weight percentage, heat to 75°C to 95°C in a constant temperature water bath until completely dissolved, 325 mesh filter;

[0043] (3) Preparation of slurry: by weight percentage, the above-mentioned 1% glass powder, 85% flake silver powder, 5% nano-silver powder, 5% organic vehicle, 3% butyl carbitol acetate solvent, 0.2 % dioctyl phthalate, 0.8% zinc stearate dispersant, mix them evenly in a planetary or other mixer, then disperse them on a three-roll machine to below 10 μm, and finally filter them in a 325-mesh sieve , the front silver paste with a viscosity of 260kcps measured b...

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Abstract

The invention discloses a method for preparing silicon-based solar front silver paste. The paste consists of 0.5 to 5 percent of glass powder, 40 to 85 percent of laminar silver powder, 5 to 45 percent of nano silver powder, 5 to 10 percent of organic carrier, 2 to 6 percent of solvent and 0.2 to 2 percent of auxiliary agent. The method mainly comprises the following steps of: (1) preparing the glass powder, (2) preparing the organic carrier, and (3) preparing the paste. According to the main design scheme of the invention, the printing height of a grid line and the conversion efficiency of a contact resistor and a battery can be changed by changing the adding proportion of the glass powder, the laminar silver powder and the nano silver powder; the viscosity and the printability of a product can be adjusted by changing the adding proportion of the organic carrier and the solvent; and the plasticity, leveling property and printability of the product can be adjusted by changing the adding proportion of a plasticizer. The paste of the invention has excellent printability, the sintered paste and a silicon chip form good alloy, a grid line electrode has great height, the series resistance is low, and the battery has high conversion efficiency.

Description

Technical field: [0001] The invention belongs to the technical field of electronic materials and relates to a method for preparing front silver paste for silicon-based solar energy. Background technique: [0002] Traditional fossil energy is increasingly scarce, and the problem of global climate change caused by excessive emissions of carbon dioxide and other greenhouse gases has long existed and intensified. More and more people and governments in countries have realized that the transformation of energy structure is imperative. Solar photovoltaic power generation The widespread use of clean and renewable energy has become the trend of the times. The advanced countries represented by Germany and Japan have taken the lead in adopting effective government subsidy policies, which has led to a sharp increase in the demand for photovoltaic cells, and has also driven the world, including my country. With the rapid rise of various photovoltaic production and markets, China has succe...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224H01L31/18
CPCY02P70/50
Inventor 陈春锦
Owner IRICO
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