A simple method for preparing "Sodium-free" thermally grown silicon dioxide on silicon

Abstract
A simple, reproducible MOS process requiring few steps and no elaborate equipment was developed. A surface charge density of 1 × 1011/cm2was obtained for 1000-Å thermal oxide on ⟨100⟩ 10-ohm ċ cm p-type silicon chips after mounting and bonding. Stability results after temperature-bias test (3 min at 300°C with a field of 106V/cm) exhibited a flatband voltage shift of only -0.50 V.