Combination of Synchrotron Ellipsometry and Table-Top Optical Measurements for Determination of Band Structure of DLC Films

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Authors

FRANTA Daniel NEČAS David ZAJÍČKOVÁ Lenka BURŠÍKOVÁ Vilma COBET Christoph

Year of publication 2011
Type Article in Periodical
Magazine / Source Thin Solid Films
MU Faculty or unit

Faculty of Science

Citation
Web http://dx.doi.org/10.1016/j.tsf.2010.12.059
Doi http://dx.doi.org/10.1016/j.tsf.2010.12.059
Field Solid matter physics and magnetism
Keywords diamond-like carbon; amorphous hydrogenated carbon; optical properties; band structure
Description Model of the DLC band structure that took into account valence to conduction band transitions, pi-to-pi* and sigma-to-sigma*, and valence to extended states transitions sigma-to-xi* was confirmed by using the synchrotron ellipsometry at BESSY II in the range 5–30 eV combined with table-top ellipsometry and spectrophotometry in UV-IR range. The range up to 30 eV covered all the transitions from valence to conduction bands because the maximum energy transition of pi-to-pi* and sigma-to-sigma* were 9.03 and 28.1 eV, respectively. The band gaps of these transitions were 0.75 and 4.74 eV, respectively.
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