Journal article
Properties of BaTiO3 thin films deposited by radiofrequency beam discharge assisted pulsed laser deposition
National Institute for Laser, Plasma and Radiation Physics P.O. Box MG–16, RO-76900, Bucharest, Romania
CNR-IDAC, Area di Ricerca Tor Vergata, Via del Fosso del Cavaliere 100, Rome 00133, Italy
BaTiO3 (Barium titanate, BTO) thin films were grown on Pt coated Si substrates by radiofrequency discharge assisted pulsed laser deposition (RF-PLD). A standard experimental set-up consisting in a pulsed YAG-Nd laser working at wavelength of 355nm and incident fluence in the range of 2–3J/cm2 and assisted by a radio frequency plasma discharge (power RF of about 50–200W in a O2 gas flow ranged from 1 to 100sccm) was used to produce films starting from a BTO ceramic target.
Using a special configuration of radio frequency discharge, a beam of excited and/or ionized oxygen species was produced and directed toward the substrate: reactivity increases and oxygen vacancies in deposited thin films were effectively reduced, so thin films dielectric and ferroelectric properties were improved.
High dielectric constant values (on the order of hundreds) with losses as low as 0.008–0.08 have been obtained: a comparison with films obtained without RF discharge has been carried out..
Language: | English |
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Year: | 2003 |
Pages: | 160-166 |
ISSN: | 18734944 and 09215107 |
Types: | Journal article |
DOI: | 10.1016/j.mseb.2003.10.103 |