Heat Affected Zone and inter-metallic´s formation in gold wire thermosonic bonding as function of wire material

The paper is focused on the Heat Affected Zone (HAZ) and Inter-Metallic Compound (IMC) formation in gold wire bonding using different dopants in gold wire material. The HAZ is studied as a function of different current in the free air ball settings. It has been identified that high Ca dopant containing gold wire significantly leads to less inter metallization reaction of components in between Gold and Aluminum when compared with low Ca dopant containing gold wire. Similarly high Ca dopant containing gold wire has less HAZ when compared to low Ca dopant containing gold wires. The detailed analysis has been carried out with the help optical microscopy, Field Emission Scanning Electron Microscope (FE-SEM) and Energy Dispersive X-ray (EDX) spectroscopy.