Veysel Ünsür received his bachelor’s degree in Physics, his master’s degree in Applied Physics and Optical Science in 2013 and his Ph.D. in Electrical and Computer Engineering in 2018 from University of North Carolina Charlotte USA. He is currently an assistant professor of Energy Systems Engineering in Necmettin Erbakan University, Turkey. He has experienced in fabrication, characterization and optimization of solar photovoltaics. During his Ph.D., Veysel Unsur has involved in numerous research and industry projects some of which includes with National Renewable Energy foundation (NREL), National Science Foundation (NSF), Department of Energy of USA (DOE) and University of New South Wales (UNSW) Photovoltaic Research Center.
Title and Abstract of the Speech:
Alternative approaches for metallization of silicon solar cells
Necmettin Erbakan University, Turkey
High living standards all over the world, leading to high energy demand, have resulted in massive consumption of conventional fossil fuels like coal, oil, natural gas etc. In order to make up for this increasing global demand, alternative means to produce energy have been emerging. One of which is solar photovoltaics that is most promising and the fastest growing industry as of to date. Cost and efficiency, however, are the two opposing challenges that must be overcome for cost-effective solar electricity. Metallization, after silicon wafer cost, is not only the second most expensive step in solar cell production but also one of the key steps that can be tailored to increase the overall efficiency.
Screen printed silver (Ag) metal contacts has been the most utilized material because of its excellent conductivity and solder-ability to silicon (Si). Its relatively low diffusion coefficient in Si guarantees good contact with the substrate and longevity of the solar cell. In spite of great electrical advantages, the cost of Ag corresponds to almost 30% of total cost due to availability constraints. There is also the fact that Ag containing metallic pastes include lead oxide (PbO) as well, which is a toxic material that carries health concerns. Therefore, either replacing silver by more readily available and cheaper materials or lowering the amount of Ag usage per cell is crucial for solar cells to penetrate into the energy market.