Ion energy-dependent electrical properties of sulfur implants in GaAs

Abstract
The dependence upon ion energy of the electrical properties of sulfur‐implanted GaAs was investigated. For low doses, electrical activation was found to increase with energy up to 300 keV and then decrease with increasing energy. A correlation was found between the activation dependence upon energy and upon dose. An activation efficiency of 80% was obtained for a dose of 4×1013/cm2 at 300 keV. The carrier‐profile dependence upon the energy was also determined, showing a maximum carrier concentration of 1×1018/cm3.