Low-K Interconnect Stack with Thick Metal 9 Redistribution Layer and Cu Die Bump for 45nm High Volume Manufacturing

Interconnect process features are described for a 45nm high performance logic technology. Through extensive use of highly manufacturable carbon doped oxide low-k dielectric layers and aggressive scaling of the SiCN etch stop film the Metal-1 to Metal-8 interconnect stack demonstrates a 10% average capacitance reduction over the 65nm process. The interconnect stack also features a very thick Metal-9 layer to provide a low resistance path for the power and I/O routing. The combined interconnect stack provides high performance and reliability and supports a Pb-free 45nm process.