Angular E®ects on F⁺ Etching SiC: MD Study

Molecular dynamics (MD) simulations were performed to investigate F+ continu- ously bombarding SiC surfaces with energies of 100 eV at di®erent incident angles at 300 K. The simulated results show that the steady-state uptake of F atoms increases with increasing incident angle. With the steady-state etching established, a Si-C-F reactive layer is formed. It is found that the etching yield of Si is greater than that of C. In the F-containing reaction layer, the SiF species is dominant with incident angles less than 30o. For all incident angles, the CF species is dominant over CF2 and CF3.