Bi계 Glass frit을 사용한 고온소결형 Ag Paste의 신뢰성 향상을 위한 최적화 연구

Abstract

As global warming and environmental problems become more serious worldwide, there is growing interest in environmentally friendly policies. In order to solve this, the importance of the development and development of new and renewable energy is increasing. New energy includes fuel cells and hydrogen energy, and renewable energy includes solar heat, solar power, wind power, geothermal energy, biomass, and ocean energy. Among them, sunlight produces electricity using solar cells, and Ag paste is used for the solar cells. The glass frit used in conventional pastes contains lead(Pb) and is used, which is convenient because of its low price and melting point. However, lead is a harmful substance to the human body, and it is necessary to replace lead while restricting its use internationally. Lead-free glass frit was developed to replace the use of lead, and much research and development was done to replace it. The glass frit used for the silver paste is low-priced, has excellent insulation and chemical resistance, promotes densification between silver, and plays a role of increasing the adhesive force between the substrate and the paste. The composition of lead-free glass frit developed to replace lead is largely Bi₂O₃-based, B₂O₃-based, P₂O₅-based, etc. Among them, the glass transition temperature of Bi-based Glass frit is similar to that of Pb-based Glass frit is often used as a substitute material. In addition, it is possible to have good adhesiveness in which the glass transition temperature(Tg) of the glass frit must be different depending on the firing temperature of the paste, and the chemical stability of the paste due to the glass frit must also be taken into consideration. Due to the excellent conductivity of the paste, we selected Tg that matched the firing and reliability conditions through the Tg experiment of the glass frit, and proceeded with the experiment on the content of the glass frit to determine the minimum amount that the paste can adhere to the substrate. It was selected to reduce the resistance of the paste. Through these experiments, the resistance of paste using Bi-based glass frit is low, the rate of change in post-reliability resistance is small, and the performance of silver paste used in various fields such as electronic parts and solar cells is improved. I researched with the goal of doing that.