The structure of 3CSiC carbonized layer on Si substrate
We studied the structures of 3CSiC carbonized layers respectively formed on a Si substrate by SEM, XPS, X-ray reflectivity measurement, RHEED, and TEM. The carbonized layers formed by heating at a temperature of 1000C for 10 min with a ramp rate of 100C min?1 were featureless on the surfaces, about 3.3 nm in thickness, and low in crystallinity. Surface grooves along the ?110? directions were observed at some places on the carbonized layers formed by heating at 1250C for 1 min. The layers had many planar defects, and voids did not exist at the SiC/Si interfaces. We also studied the samples which were annealed at 1200C after the carbonization. A sharp and streaky SiC diffraction pattern was obtained by RHEED, which indicated good surface crystallinity and flatness. Voids existed at the SiC/Si interfaces in these samples.
sic carbonization heteroepitaxy cvd