Positive Study Solar Cell Conductive Silver Paste Of

The conductive silver paste for most of solar cells usually contain lead, and green products is the primary requirements of social development, and various countries in the world have introduced the corresponding rules for lead-free conductive paste, so the research and development of lead-free conductive silver paste for solar cells, which has great significance and practical value in solving the shortage of resources and environmental pollution.In this paper, experimental studies on preparing the conductive silver paste for solar cells positive and glass powder, organic vehicle which are important composition of the solar cells silver paste. The lead-free glass powders with better adhesion were selected by orthogonal test method. A series of lead-free glass powders were prepared by melting water quenching mixture of Bi2O3-SiO2-B2O3-ZnO-SnO2powder at1250℃.The lead-free glass powders about3.1μm with narrow particle size distribution was fabricated in best condition that ball-to-water-to-powder weight ratio2.5:0.8:1and ball-milling of12h. According to the screening results of orthogonal test, the effects of the components, ZnO(wt%), SiO2(wt%) and SnO2(wt%) of the glass powders on the adhesion and the transition temperature have been studied by single-factor experimentation. The volatility of the organic carrier used as the conductive silver paste for silicon solar cells was studied. The effect of different solvents on volatility of carrier was investigated. A kind of organic carrier having gradual volatility was prepared. When proper ethocel were added into the organic vehicle, the proprieties of the organic vehicle became more excellent.Finally, silver paste was fabricated by uniformly mixing with silver powder, glass powder and organic carrier, silver electrodes film of solar cells positive were made through a series of steps including artificial silk-screen printing, drying, sintering. The effects of the sintering temperature, sintering time, silver powders and glass powder content and mixing ratio of flake silver powder and spherical silver powder on the silver film adhesion and conductive properties were studied in details. The solar cell silver positive electrode with adhesion8.2N, square resistance of5.6mΩ/□was prepared.