ATOMIC-RESOLUTION ULTRAHIGH-VACUUM SCANNING-TUNNELING-MICROSCOPY OF EPITAXIAL DIAMOND(100) FILMS

We report atomic resolution images of chemical vapor deposition grown epitaxial diamond (100) films obtained in ultrahigh vacuum (UHV) with a scanning tunneling microscope. A (2×1) dimer surface reconstruction and amorphous atomic regions are observed. The (2×1) unit cell is measured to be 0.51±0.01×0.25±0.01 nm2. The amorphous regions are identified as amorphous carbon. A radial structure 1.5 nm in diameter is observed on a plane at a 20°slope to the (2×1) surface. Tunneling current versus voltage spectra in UHV and Raman spectra are also obtained. © 1995 American Institute of Physics.