Papers Published

1. Kong, H.S. and Glass, J.T. and Davis, R.F., Chemical vapor deposition and characterization of 6H-SiC thin films on off-axis 6H-SiC substrates, J. Appl. Phys. (USA), vol. 64 no. 5 (1), pp. 2672 - 9 [1.341608] .
   (last updated on 2007/04/17)

   Abstract:
   High-quality, monocrystalline 6H-SiC thin films have been epitaxially grown on 6H-SiC 0001 substrates which were prepared 3° off-axis from ⟨0001⟩ towards ⟨112¯0⟩ at 1773 K via chemical vapor deposition (CVD). Essentially, no defects were generated from the epilayer/substrate interface as determined by cross-sectional transmission electron microscopy (XTEM). Double positioning boundaries which were observed in β-SiC grown on 6H-SiC substrates were eliminated as confirmed by plan-view TEM. A strong dependence of the surface morphology of the as-grown thin films on the tilting orientation of the substrates was observed and reasons for this phenomenon are discussed. The unintentionally doped 6H-SiC thin films always exhibit n-type conduction with a carrier concentration on the order of 10¹⁶ cm^-3. Au-6H-SiC Schottky barrier diodes were fabricated on the CVD 6H-SiC thin films and it was found that the leakage current at a reverse bias of 55 V was only 3.2×10^-5 A/cm². This is compared to SiC films grown on other substrates

   Keywords:
   chemical vapour deposition;semiconductor materials;semiconductor thin films;silicon compounds;surface structure;transmission electron microscope examination of materials;