Mv. Rao et al., ION-IMPLANTATION IN 6H-SIC, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 127, 1997, pp. 655-659
In this study we have performed N, P, Al, B, V, Si, and C implantation
s to obtain p-type, n-type, and semi-insulating regions in 6H-SiC crys
tals. Post-implantation annealings were performed in either a conventi
onal ceramic processing furnace or using microwaves in the temperature
range of 1200-1700 degrees C, The material was characterized by secon
dary ion mass spectrometry, Hall, Rutherford backscattering via channe
ling, and two-probe I-V measurements. N-type regions with a maximum ro
om temperature electron concentration of 2 x 10(19) cm(-3) were obtain
ed using N and P implantations, Though p-type regions were obtained by
Al and B, the room temperature hole concentrations were low due to th
e deep acceptor levels associated with these impurities. The Si and C
bombardment gave regions with resistivities as high as 10(9) Omega cm
compared to 1 Omega cm in the starting material.