Nitrogen Impurities in 3C-SiC Epilayers
Undoped 3C-SiC epilayers with residual carrier densities as low as 1×1015 cm−3 were obtained by chemical vapor deposition using pure SiH4 and C3H8 source gasses instead of diluted source gasses. Hall-effect, ESR, and SIMS measurements were carried out for these 3C-SiC epilayers. The epilayers having carrier densities below l×l015cm-3 showed no significant 3-line ESR signal associated with nitrogen impurities. The reduction in residual carrier density is explained in terms of the nitrogen impurity concentration in 3C-SiC epilayers. Lattice site location of nitrogen atoms in 3C-SiC was determined by the 15N(p,α0)12C nuclear reaction analysis combined with channeling.
KeywordsElectron Spin Resonance Spin Density Carrier Density Electron Spin Resonance Signal Intensity Nitrogen Impurity
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