Title :
Effect of Surface Termination on Electronic Structure of Nano-Crystalline Diamond Film
Author :
Liu, Fengbin ; Wang, Jiadao ; Liu, Bing ; Li, Xuemin ; Chen, Darong
Author_Institution :
State Key Lab. of Tribology, Tsinghua Univ.
Abstract :
Hydrogenated and oxygenated nano-crystalline boron-doped diamond (BDD) films were prepared by hydrogen-plasma treatment and boiling in the strong acids, respectively. Surface characteristics of the two diamond films have been investigated by scanning electron microscopy (SEM) and Raman spectroscopy. In order to clarify detailed electronic structures of surface-treated nano-crystalline diamond films, the tunneling current versus voltage (I-V) spectroscopy curves have been measured by scanning probe microscopy (SPM). C 1s core-level spectra and valence band spectra have been also analyzed by X-ray photoelectron spectroscopy (XPS). The characteristics of two types of diamond surfaces are similar. Hydrogen-terminated BDD surface exhibits good conductivity with a narrow band gap. However, the oxygen-terminated one is insulating with a wide band gap. Additionally, there exist surface states in the band gap of the hydrogenated diamond film and no surface states in the band gap of the oxygenated diamond film. Compared with the hydrogen-terminated diamond surface, the surface valence band corresponding to the oxygen-terminated diamond film bends downwards
Keywords :
Raman spectra; X-ray photoelectron spectra; boiling; boron; diamond; doping; energy gap; nanostructured materials; scanning electron microscopy; scanning probe microscopy; surface states; surface structure; surface treatment; valence bands; C:B; I-V curves; Raman spectroscopy; SEM analysis; SPM analysis; X-ray photoelectron spectroscopy; XPS analysis; band gap; boiling; diamond film; doping; electrical conductivity; hydrogen-plasma treatment; hydrogenation; nanocrystals; oxygenation; scanning electron microscopy; scanning probe microscopy; surface termination; valence band spectra; Binary decision diagrams; Nanostructures; Photonic band gap; Raman scattering; Scanning electron microscopy; Scanning probe microscopy; Spectroscopy; Surface treatment; Tunneling; Voltage; diamond; electronic structure; nano-crystal; surface treatment;
Conference_Titel :
Nano/Micro Engineered and Molecular Systems, 2006. NEMS '06. 1st IEEE International Conference on
Conference_Location :
Zhuhai
Print_ISBN :
1-4244-0139-9
Electronic_ISBN :
1-4244-0140-2
DOI :
10.1109/NEMS.2006.334863
