Coordination and configuration analysis of local structures of B-C-N hybrid thin films

Shimoyama, Iwao   ; Uddin, M. N.*; Baba, Yuji  ; Sekiguchi, Tetsuhiro  ; Nagano, Masamitsu*

Graphite-like B-C-N hybrids have been expected to control a wide variety of electronic properties from metal to insulator. However, since most B-C-N hybrids have complex structure including various unknown chemical bonding states, the local structures have not been clarified yet. In order to clarify the chemical bonding states of this material, we measured near-edge X-ray absorption fine structure (NEXAFS) of B-C-N hybrid thin films. B-C-N hybrid thin films were synthesized by ion beam deposition of borazine on a graphite substrate, and the composition was controlled by ion fluence. Some * peaks were observed in B and N K-edge NEXAFS spectra, and relative intensities of the peaks depended on ion fluence and polarization. Electronic structures of some model clusters are calculated by a molecular orbital theory, and compared with NEXAFS spectra. From the experimental and theoretical results, we discuss some models of local structures.