Modelling and simulation for dielectric constant of aerogel
Aerogel exhibits several attractive features as an interconnect dielectric in ULSI, because of its ultralow dielectric constant (?eff=1?4.2), high dielectric strength, and good gapfill capabilities. In this paper, a uniformly distributed pore structure model which shows a significant improvement compared with parallel and serial models is presented to simulate the ?eff of aerogel. An empirical relation between the ?eff of aerogel and its porosity is obtained. At the same time, the effect of porosity, pore shape, pore size, pore-size distribution and pore distribution on the ?eff of aerogel is determined. It is found that the porosity is a major factor which affects ?eff.
dielectric aerogel porosity