Publication Type:Journal Article
Source:Chemistry of Materials, Volume 22, Number 13, p.3983-3987 (2010)
Keywords:Conductive films, Critical growth, deposition, Doping (additives), Electric resistance, Epitaxial films, Epitaxial growth, Epitaxial thin films, High transparency, Intrinsic optical properties, La doping, Lanthanum, optical properties, Opto-electronics, Optoelectronic devices, Oxide heterostructures, oxygen, oxygen vacancies, Perovskite, Perovskite oxides, pulsed laser deposition, Pulsed-laser deposition technique, SrTiO, Strontium, strontium titanate, Strontium titanates, Ultraviolet spectroscopy, UV visible spectroscopy, UV-visible
Epitaxial thin films of strontium titanate doped with different concentrations of lanthanum and oxygen vacancies were grown on LSAT substrates by pulsed laser deposition technique. Films grownwith 5-15%La doping and a critical growth pressure of 1-10mTorr showed high transparency (>70-95%) in the UV-visible range with a sheet resistance of 300-1000 Ω/0. With the aid of UV-visible spectroscopy and photoluminescence, we establish the presence of oxygen vacancies and the possible band structure, which is crucial for the transparent conducting nature of these films. This demonstration will enable development of various epitaxial oxide heterostructures for both realizing opto-electronic devices and understanding their intrinsic optical properties. © 2010 American Chemical Society.
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