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Solar cell back face silver paste and preparing method thereof

A technology on the back of solar cells, which is applied in cable/conductor manufacturing, circuits, electrical components, etc., can solve the problems of low contact resistance of silver paste on the back, non-environmental protection, environmental pollution, etc., to improve photoelectric conversion efficiency, optimization and stability performance, high photoelectric conversion efficiency

Inactive Publication Date: 2015-04-29
ZHEJIANG ZHONGXI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low contact resistance performance of the back silver paste in the prior art still needs to be improved
In addition, the glass frit used in the conductive silver paste of solar cells in the prior art is usually lead-containing mixed powder. Although the glass frit has a low softening temperature and good electrical stability, it contains high lead content and causes serious environmental pollution. Meet environmental protection requirements

Method used

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  • Solar cell back face silver paste and preparing method thereof
  • Solar cell back face silver paste and preparing method thereof
  • Solar cell back face silver paste and preparing method thereof

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Embodiment Construction

[0024] A specific embodiment of the present invention is a silver paste on the back of a solar cell, and its composition and weight percentage are as follows: 45-60wt% metal powder, 1-6wt% lead-free bismuth salt glass powder and 31-46wt% organic binder, 0 %~3wt% additives, the metal powder mainly includes silver powder, followed by at least one of copper powder, aluminum powder and nickel powder, lead-free bismuth salt glass powder includes 50~85wt% Bi 2 o 3 , 1~25wt% ZnO, 1~10wt% B 2 o 3 , 1~5wt% Al 2 o 3 , 1~5wt% BaO, 1~3wt% SiO 2 , 0~2wt% Sb 2 o 3 , the organic binder includes 1-15wt% organic vehicle and 5-98wt% organic solvent, the organic vehicle is at least one of acrylic resin, ethyl cellulose, butyl cellulose; the organic solvent is castor oil, terpineol , diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, sorbitan monostearate; additives are zinc oxide, titanium oxide, nickel oxide, nickel selenide and tellurium at least one of nicke...

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Abstract

The invention discloses a solar cell back face silver paste and a preparing method thereof. The silver paste is used for producing back face electrodes of a solar cell. The silver paste comprises, by mass, 45-60% of electric conduction metal powder such as silver powder, copper powder, aluminum powder and nickel powder, 31-46% of organic bond, 1-6% of lead-free bismuthate glass powder and 0-3wt% of additive. The preparing method of the silver paste comprises preparation of the lead-free bismuthate glass powder, preparation of the organic bond, preparation of the additive and the processing technology of the sizing agent. According to the prepared back face electrode silver paste containing the additive, silver layers are compact after the prepared back face electrode silver paste is sintered, makes very good ohmic contact with a silicon wafer and has low series resistance and excellent electrical conductivity, the adhesive force between the back face electrode and the silicon wafer is improved, and the photoelectric converting efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of paste for solar cells, in particular to a silver paste on the back of a solar cell and a preparation method thereof. Background technique [0002] With the increasingly serious environmental pollution and the deepening of the concept of low-carbon environmental protection, safe, clean and efficient energy is more and more popular among people. Among them, crystalline silicon solar cell technology, as the mainstream of solar technology development, has been receiving much attention. Through continuous research on solar cell technology, the conversion efficiency of cells has been continuously improved. [0003] A solar cell is a device that converts light energy into electrical energy through the photoelectric effect. The working principle of photoelectric effect solar cells: when sunlight irradiates on the p-n junction of crystalline silicon semiconductor, new hole-electron pairs are formed, and under the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00
Inventor 郑大受曾凯卜家威
Owner ZHEJIANG ZHONGXI ELECTRONICS TECH
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