Integration technology of polymetal (W/WSiN/Poly-Si) dual gate CMOS for 1 Gbit DRAMs and beyond

Integration technology of low resistance word line and scaled CMOSFETs for 1 Gbit DRAMs and beyond is proposed. Polymetal (W/WSiN/Poly-Si) word lines and dual gate CMOS FETs with oxynitride gate dielectric were introduced to the 8F/sup 2/ DRAM cell technology. Low sheet resistance of 4.5 /spl Omega///spl square/ word line with 40 nm thick W and high performance dual gate 0.18 /spl mu/m CMOS were successfully integrated without any constraint.