Abstract
We have deposited SiO2 using plasma-enhanced TEOS-based (PE-TEOS) CVD method and USG and PSG using atmosphere-pressure CVD method on Pb(Zr, Ti)O3(PZT) capacitors. The ferroelectric and dielectric properties of the SiO2 covered PZT capacitors were characterized. SIMS (secondary ion mass spectroscopy) was utilized to obtain hydrogen concentration in the deposited ILD and IMD materials. The concentration of hydrogen in the PE-TEOS-derived SiO2 was lower than that in the PSG and the USG. Internal stress was low tensile at room temperature and the behavior of thermal stress hysteresis was nearly similar for all SiO2 materials. Remnant polarization (Pr) of the PE-TEOS covered PZT capacitors was severely degraded as compared to that of as-deposited capacitors. From these results, we have concluded that the degradation of ferroelectric characteristics of PZT capacitors associated with the ILD and IMD processes was closely related to the plasma-induced damage.
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