This paper describes the influence of phosphorus incorporation into SiO_2/4H-SiC system. The main scope is an analysis of the slow responding trap states (near interface traps) since the influence of phosphorus technology on fast traps has already been investigated by numerous research groups. Two different phosphorus incorporation methods were incorporated - the diffusion-based process of POCl_3 annealing and ion implantation. We have shown that regardless of method used a new distinct near interface trap center can be found located approximately at E_{V} + 3.0 eV. This trap can be related to the incorporated phosphorus amount as shown through secondary ion mass spectroscopy measurements.
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