The SOI (silicon-on-insulator) technology was regarded as a very important technique of the silicon-integrated circuit in the 21 century. The SIMOX (separation by implanted oxygen) and SIMNI (separation by implanted nitrogen) films were formed by O+ or N+ ion implantation into silicon with several methods. The SR (spreading resistance)
Hall effects and DLTS (deep-level transient spectroscopy) measurements were used to analyse the surface electrical properties of the SOI structures. The results show that the step-implanted SOI films have good electrical properties.