Front-surface silver paste for diamond wire-cut silicon wafer solar cell and preparation method of front-surface silver paste

A diamond wire cutting and solar cell technology, applied in the field of solar cells, can solve the problems of lower photoelectric conversion efficiency and high series resistance of front silver paste, and achieve the effects of slowing down fluidity, enhancing welding resistance and avoiding damage

Inactive Publication Date: 2018-05-15
JIANGSU HOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the series resistance of the front silver paste prepared by using this glass powder is relatively high. This shortcoming is clearly stated in the data comparison in the patent publication, which directly leads to a decrease in photoelectric conversion efficiency and an increase in the battery decay rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] A method for preparing silver paste on the front side of a diamond wire-cut silicon wafer solar cell, characterized in that the preparation method comprises the following process steps:

[0045] Step 1: Prepare an organic vehicle: according to the organic vehicle, it is composed of a solvent, a resin, and a thixotropic agent, and weigh the resin with a mass fraction of 6-20%, the thixotropic agent with a mass fraction of 1-6%, and the rest as described The solvent is stirred and dissolved in a circulating water bath at a constant temperature of 40-70°C for 1-3 hours to obtain a uniform and stable organic carrier;

[0046] Step 2: Preparation of added glass powder: according to the added glass powder is Pb-Zn-Si high softening point glass, the added glass powder includes the following components in weight percentage: 10-35% of PbO, 20-40% of ZnO, 5 ~20% SiO 2 , 2~8% B 2 o 3 , 1~10% Cu 2 O, 1-10% MnO 2 , 0~5% TiO 2 . Ratio of ingredients Weigh the raw materials, an...

Embodiment 1

[0051] Preparation of organic vehicle: according to the proportion of the above formula, take by weighing 3% ethyl cellulose, 15% hydrogenated rosin ester, 6% hydrogenated castor oil anti-settling thixotropic agent, 76% solvent (pine oil Alcohol, butyl carbitol, butyl carbitol acetate, dimethyl adipate, lauryl alcohol ester, dimethyl glutarate, diethylene glycol dibutyl ether, etc. ), stirring and dissolving in a circulating water bath at a constant temperature of 40-70° C. for 1-3 hours to obtain a uniform and stable organic carrier.

[0052] Prepare and add glass powder: weigh 45% of PbO, 20% of ZnO, and 15% of SiO according to the formula 2 , 10% B 2 o 3 , 5% Cu 2 O, 3% MnO 2 , 2% TiO 2 For the oxide powder, use a powder mixer to fully pre-mix. Put the mixed powder into a platinum crucible, melt it at 1100-1300°C for 1-2 hours, pour the molten glass into deionized water and quench it. The glass fragments obtained after water quenching were transferred to a ball mill ...

Embodiment 2

[0055] Preparation of organic vehicle: take by weighing mass fraction according to formula ratio and be 5% ethyl cellulose, 15% hydrogenated rosin ester, 4% hydrogenated castor oil anti-settling thixotropic agent, mass fraction be 76% solvent (terpineol , butyl carbitol, butyl carbitol acetate, dimethyl adipate, lauryl alcohol ester, dimethyl glutarate, diethylene glycol dibutyl ether, etc. ), stirring and dissolving in a circulating water bath at a constant temperature of 40-70° C. for 1-3 hours to obtain a uniform and stable organic carrier.

[0056] Prepare and add glass powder: weigh 48% of PbO, 24% of ZnO, and 13% of SiO according to the formula 2 , 9% B 2 o 3 , 3% Cu 2 O, 2% MnO 2 , 1% TiO 2 For the oxide powder, use a powder mixer to fully pre-mix. Put the mixed powder into a platinum crucible, melt it at 1100-1300°C for 1-2 hours, pour the molten glass into deionized water and quench it. The glass fragments obtained after water quenching were transferred to a ba...

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Abstract

The invention discloses a front-surface silver paste for a diamond wire-cut silicon wafer solar cell and a preparation method of the front-surface silver paste. The silver paste contains the followingcomponents: spherical silver, an organic carrier, main body glass powder, additional glass powder and an aid. The preparation method comprises the following steps: preparing the organic carrier: weighing resin, a thixotropic agent and a solvent, and stirring for dissolving under a circulating water bath temperature maintenance condition at a constant temperature of 40-70 DEG C, so as to obtain the uniform and stable organic carrier; preparing the additional glass powder: weighing the raw materials, adequately premixing by virtue of a power mixing machine, adding the mixed powder into a platinum crucible, pouring fused glass liquid into deionized water, carrying out water quenching, and carrying out ball-milling, crushing, sieving, separation and drying on the glass powder after water quenching, so as to obtain the glass powder; and weighing spherical silver powder, the main body glass powder, the organic carrier and the aid, putting the raw materials into a slurry tank, stirring to form paste, uniformly stirring and mixing by virtue of a planetary homogenizer, and grinding and dispersing on the mixture by virtue of an EXAKT experimental three-roller machine until the diameter of the mixture is less than 6 microns, so as to finally obtain the silver paste.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a crystalline silicon solar cell suitable for diamond wire cutting, so that the front silver paste can increase the pulling force of the cell and improve the photoelectric conversion efficiency. Background technique [0002] With the development of society and the continuous improvement of people's economic and living standards, people's demand for energy is also increasing. Energy security is gradually closely linked with political and economic security. However, human beings are enjoying the economic development and scientific and technological progress brought about by energy. At the same time, it has encountered a series of unavoidable energy security challenges. Issues such as energy shortage, resource competition, and environmental pollution caused by excessive use of energy directly threaten the survival and development of human beings. As a clean energy source, photov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
CPCH01B1/16H01B1/22H01B13/00H01L31/022425
Inventor 陈志鹏
Owner JIANGSU HOYI TECH
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