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RuTa(N) film has been prepared by doping N in Ru-Ta alloy and investigated its use as a barrier layer against Cu diffusion in Cu interconnects. It was found that RuTa(N) has a poor barrier property against Cu in the BEOL process, since N in Ru-Ta alloy is desorbed and RuTa(N) is recrystallized by heat treatment. It was also shown that RuTa(N) has inferior reliability due to its poor wettability with...
Nitrogen ion implantation (N2 I.I.) prior to Ni film deposition successfully suppresses the agglomeration of nickel silicide (NiSi) formed on arsenic doped silicon substrate in NMOS region, and drastically improves the thermal stability of its resistivity at narrow lines. Using this technique, lower sheet resistance of NiSi narrow line can be kept at high annealing temperature of 650degC for 30 sec...
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