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Bombarding a carbon target with low energy nitrogen ions causes the release of neutral carbon atoms (physical sputtering) and volatile carbon nitride compounds (chemical sputtering) with relative yields dependent on the energy of the nitrogen beam. The chemically sputtered species are volatile and can be condensed on the substrate by reducing its temperature. Carbon nitride films have been deposited at varying nitrogen beam energies and substrate temperatures in a dual ion beam deposition chamber. Films were grown both with and without the presence of an additional assisting nitrogen beam. Reduction of the substrate temperature in conjunction with low sputter beam voltages (< 200V) caused the nitrogen concentration to attain a maximum value of 44%, the optical band gap to increase to 2.2 eV, the sheet conductivity to decrease to less than IE-9 (Ohm cm) {-1} and the density to be reduced to 1.6 gcm {-3}. The chemical structure was investigated by Fourier Transform Infra-Red (FTIR), X-ray photoelectron spectroscopy (XPS) and Auger Electron Spectroscopy (AES). The increasing transparency is accompanied by structural changes indicating a transition from a predominantly sp(2) bonded amorphous sp(2)/sp(3) C-N network to a more linear polymer-like structure consisting predominantly of doubly and triply bonded C and N atoms.

Additional information

Authors: BAKER M, JRC Ispra (IT);HAMMER P, JRC Ispra (IT);LENARDI C, JRC Ispra (IT);GISSLER W, JRC Ispra (IT);HAUPT J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 5th International Conference on Plasma Surface Engineering, Garmisch-PartenKirchen (DE) 9-13 September, 1996
Availability: Available from (1) as Paper EN 40813 ORA
Record Number: 199711238 / Last updated on: 1997-10-10
Original language: en
Available languages: en