Investigations of Fuch–Kliewer phonons and hydrogen adsorption of 6H–SiC surfaces by high-resolution electron-energy-loss spectroscopy

In this contribution, the optical Fuchs–Kliewer (FK) surface phonon and hydrogen adsorption of 6H–SiC surfaces were investigated with high-resolution electron-energy-loss spectroscopy (HREELS). The different HREEL spectra of the FK surface phonons were obtained from clean (0001) Si- and (0001̄) C-terminated surfaces. It was noticed that the full width at half maximum of elastic peaks for the reconstructed surfaces was smaller than that of unreconstructed surfaces for both (0001) Si- and (0001̄) C-terminated 6H–SiC. Under decomposing ammonia by hot filament at 1700°C, only the adsorption of hydrogen atoms on the surfaces for both Si- and C-terminated 6H–SiC was detected in the experiment.