The Corrosion Behavior of Au/Al Interface under High Accelerated Stress Test

Different cure time has significantly impact on the Au/Al interface corrosion behavior during high accelerated stress test (HAST). A detailed IMC evolution of Au/Al wire bonding interface during HAST is discussed in this paper. After 96hrs/144hrs 130 °C and 85%RH HAST, wire pull ball lift fail rate decreased with the increase of cure time. IMC phase at Au/Al interface were characterized by focus ion beam(FIB)/transmission electron microscope(TEM), and three types of Au-Al IMC phases were observed at the Au/Al interface. Longer cure time is favorable to increase the thickness of Au
₈
Al
₃
phase, which is better to resist corrosion and strengthen interface bonding. Au/Al interface failure mechanism is discussed in this paper.