Electronic structure of nitrogen-carbon alloys (a-CNx) determined by photoelectron spectroscopy

S. SOUTO; M. PICKHOLZ; M.C. DOS SANTOS; F. ALVAREZ

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

APS

Lugar: COLLEGE PK, MD; Año: 1998 vol. 57 p. 2536 - 2540

0163-1829

The electronic structure of nitrogen-containing diamondlike films prepared by sputtering was determined by photoelectron spectroscopy. The N 1s core-level spectra are constituted by two peaks at 400.5 and 398.2 eV associated with substitutional N sp(2) in aromatic rings and N bonded to C sp(3), respectively. On increasing N, the top of the valence band suffers profound changes. The new features are identified by a comparison of the experimental spectra with theoretically calculated density of states of nitrogen-containing graphite and C3N4 structures.