Abstract

The implantation temperature dependence of the oxygen depth profile, microstructure, radiation damage and SiO bonding was examined in Si implanted with low-energy (25 keV) oxygen. The oxygen depth profile varied with implantation temperature: Gaussian-like shape at 280°C, triangular shape at 590°C, and again a Gaussian-like shape at 740°C. SiO bonding became tighter, and Si crystal structure was maintained more easily with increasing implantation temperature. Crystal damage near the surface became small for implantation at 740°C. These results suggest that marked oxygen migration and redistribution during ion implantation, which are determined by the oxygen diffusivity and the radiation-damage depth-profile, are the essential phenomena controlling the low-energy SIMOX process.

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