Computer-Aided-Design for the prediction of the technology process and the physical device properties (TCAD) is a key tool for the development and improvement of new device concepts as well as for the analysis and understanding of device properties and device behavior under application conditions. Apart from physical device models and parameters the precise process simulation of implanted doping profiles is mandatory for a sufficient prediction quality of the subsequent device simulations. In order to verify and improve the accuracy of process simulation, we employ the – for silicon carbide – relatively new method of Scanning Spreading Resistance Microscopy (SSRM) for the characterization of doping profiles.
In this paper, an investigation into the crystal structure of Al-and N-implanted 4H-SiC is presented, encompassing a range of physical and electrical analysis techniques, with the aim of better understanding the material properties after high-dose implantation and activation annealing. Scanning spreading resistance microscopy showed that the use of high temperature implantation yields more uniform resistivity profiles in the implanted layer; this correlates with KOH defect decoration and TEM observations, which show that the crystal damage is much more severe in room temperature implanted samples, regardless of anneal temperature. Finally, stress determination by means of μRaman spectroscopy showed that the high temperature implantation results in lower tensile stress in the implanted layers with respect to the room temperature implantation samples.
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