Lead-Free Solders For Use In Solar Module Manufacturing
Authors: Christiaan L. Mey, Anthony Cao, Doug D. Perovic, BASc, MASc, Ph.D., FCAE, P. Eng. Company: University of Toronto Date Published: 10/16/2011
Abstract: Increased demand for energy coupled with the finite supply of fossil fuels—the primary source of energy in the world—has lead to increased energy costs. Heightened awareness of the short- and long-term effects of burning fossil fuels has led to the search for alternate energy sources with solar energy emerging as a leading safe and reliable candidate. Solders are widely used in the manufacturing of solar panels and inverters. While solar panels are currently exempted from the EU's RoHS restriction on lead use in manufacturing of the electronic components, there is a need to investigate the lead-free alternatives in hopes to find an entirely “green” replacement to lead-based solders. BiSn and SnAg are the most prominently used lead-free solders in current industry and is the focus of the investigation. A series of mechanical tests will be initiated to compare between the characteristics of each solder including thermal cycling reliability and cohesive strength.