New bonding material for power devices with high bonding strength for operating high temperature

Abstract

In the metallization technology for power electronic device, it has been required to develop new material for operating high-temperature at 300 °C and interconnection with high bonding strength. We have developed new method to fabricate fine metal alloy particles with narrow distribution of particle size from 0.5 to 10μm. We called it as Nanomized method. The fine particles are composed of uniform structure dispersed metal alloy in nano-scale level and do not include void in the particle. We produced bonding material from the mixture of Cu particles and Sn-based nano composite solder particles. The bonding strength of die chip on Al electrode reached 80 MPa as a top data, 50 MPa in average after 500 thermal cycles from -40 to 250 °C.