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The distribution of energy levels within the bandgap of epitaxial 4H-SiC p+/n junctions was studied. The junction was obtained by Al ion implantation on a nitrogen doped n-type epitaxial substrate. Thermally stimulated currents/capacitance (TSC/TSCAP) as well as current/capacitance deep level transient spectroscopy (I- and C-DLTS) were carried out over a wide temperature range (20–400 K). The two TSC/DLTS peaks associated with N-doping were detected for the first time and their trap signatures determined. Two hole traps relating to deep and shallow boron confirm that a boron contamination occurred during crystal growth. A negligible concentration of the Z1/2 level, which is usually the dominant level produced by irradiation of ion implant, was measured. The concentrations of all observed traps were significantly lower than nitrogen one, which determines the doping. This evidence supports the high quality …
Publication date: 
1 Jan 2007

David Menichelli, Monica Scaringella, Francesco Moscatelli, Mara Bruzzi, Roberta Nipoti

Biblio References: 
Volume: 16 Issue: 1 Pages: 6-11
Diamond and related materials