Process Integration and Reliability of Wafer Level SLID Bonding for Poly-Si TSV capped MEMS

The objective of this study was to develop a fully integrated process for wafer level MEMS packaging utilizing PolySi through silicon via (TSV) capped MEMS devices. First, interconnection metallurgy and Solid Liquid Interdiffusion (SLID) bonding process was optimized. Then sc.“vias before bonding” capping process and contact metallizations for Poly-Si TSVs were developed. Finally, the process integration was demonstrated by using piezoelectrically driven MEMSactuators. However, several design and manufacturing related challenges were observed and detailed failure analysis were carried out to resolve these problems.