The optical properties of nanocrystalline diamond films grown from a hydrogen-rich gas phase by hot filament chemical vapor deposition, as well as from an argon-rich gas phase by microwave plasma enhanced chemical vapor deposition, are reported. The influence of nitrogen incorporation on the optical absorption is investigated. The diamond films are characterized by photothermal deflection spectroscopy and temperature dependent spectrally resolved photoconductivity. An onset of absorption at about in undoped films is attributed to transitions from to states introduced into the band gap by the high amount of bonded carbon at the grain boundaries. Incorporation of nitrogen leads to a strong absorption in the whole energy spectrum, as a result of the increasing number of carbon atoms. The effect of surface states has been observed in the high energy region of the spectrum. Transitions to the conduction band tail and photothermal ionization processes account for the observed onset at . Photocurrent quenching at about is observed in the case of samples grown from a hydrogen-rich gas phase.
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6 March 2006
Research Article|
March 08 2006
Optical properties of nanocrystalline diamond thin films Available to Purchase
P. Achatz;
P. Achatz
Walter Schottky Institut,
Technische Universität München
, Am Coulombwall, D-85748 Garching, Germany
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J. A. Garrido;
J. A. Garrido
a)
Walter Schottky Institut,
Technische Universität München
, Am Coulombwall, D-85748 Garching, Germany
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M. Stutzmann;
M. Stutzmann
Walter Schottky Institut,
Technische Universität München
, Am Coulombwall, D-85748 Garching, Germany
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O. A. Williams;
O. A. Williams
Institute for Materials Research,
Universiteit Hasselt
, Wetenschapspark 1, 3590 Diepenbeek, Belgium
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D. M. Gruen;
D. M. Gruen
Materials Science Division,
Argonne National Laboratory
, Argonne, Illinois 60439
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A. Kromka;
A. Kromka
ρ-BeSt coating GmbH
, A-6150 Steinach, Austria
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D. Steinmüller
D. Steinmüller
ρ-BeSt coating GmbH
, A-6150 Steinach, Austria
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P. Achatz
J. A. Garrido
a)
M. Stutzmann
O. A. Williams
D. M. Gruen
A. Kromka
D. Steinmüller
Walter Schottky Institut,
Technische Universität München
, Am Coulombwall, D-85748 Garching, Germanya)
Electronic mail: [email protected]
Appl. Phys. Lett. 88, 101908 (2006)
Article history
Received:
July 21 2005
Accepted:
January 26 2006
Citation
P. Achatz, J. A. Garrido, M. Stutzmann, O. A. Williams, D. M. Gruen, A. Kromka, D. Steinmüller; Optical properties of nanocrystalline diamond thin films. Appl. Phys. Lett. 6 March 2006; 88 (10): 101908. https://doi.org/10.1063/1.2183366
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