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Published online by Cambridge University Press: 10 February 2011
Wiring capacitance in a multilevel interconnecting structure for sub-quarter-micron ULSI devices has been studied using a simulator called SENECA1), which is developed by the Technical University of Vienna and Sony corporation, for optimizing the structure with low dielectric constant materials as interlevel dielectric layers. The simulation results suggest that an optimized structure model should have an ILD(Inter-Level Dielectrics) thickness of 0.7μm and a metal thickness of 0.4μm for sub-quarter-micron ULSI devices. The application of the low dielectric constant materials to the ULSI devices is examined and also discussed with focusing on feasibility and reliability issues. Calculated wiring capacitance is compared with actual capacitance based on the optimized structure. The 33.2% reduction of capacitance is obtained with using an organic film with dielectric constant of 2.4 in excellent accordance with the simulation.