Optical constants of titanium monoxide TiO thin films

Visible and infrared photocatalytic activity of TiO thin films prepared by reactive sputtering

“…The band gap energy was determined by using the method reported in [30], the values obtained are presented in Table 1. Samples P2 to P5 had a band gap near to 2.91 eV, this value is reported in [31] for TiO thin films. The transmittance spectrum of sample P6 presented a double feature near the absorption edge that could be associated to band gap values of 2.91 eV and 3.2 eV; the 3.2 eV values is associated to the anatase phase of TiO 2 .…”

“…It can be seen that α decrease with the increase of OMF in the vacuum chamber. It is important to mention that α is related to the amount of light absorbed in the material which is able to generate electron-hole pairs; the values obtained for α were bigger than the reported for TiO 2 , Ti 2 O 3 and TiO [30,31]; then probably our samples have another type of transitions (states below the conduction band) or large amounts of lattice disorder, that could yield mid-gap states. Table 2 presents the measured resistivity values of the samples.…”

“…For stoichiometric TiO 2 its bandgap of 3.2 eV explains the low absorption of light for λ4400 nm, then it is expected that it does not have any photocatalytic activity at longer wavelengths. The band gap energies of TiO and Ti 2 O 3 are 2.91 eV and 3.18 eV [30,31], respectively; hence the change in the band gap obtained in the samples with the strongest absorption could be related to the presence of the TiO. The bulk conductivity of TiO has been reported around 1000 S cm À 1 , then the presence of this phase in the samples, with a strong absorption, modulate the resistivity allowing a better transport of the photogenerated carriers.…”

Preparation of inkjet-printed titanium monoxide as p-type absorber layer for photovoltaic purposes

“…These are derived from TiO, which belongs to a broad family of compounds with hard refractory metals consisting of nitride and carbide binary derivatives of IIIA, IVA, and VA transition metals [3,4]. Also, TiO exhibits a low electrical resistivity around 400 μΩ cm and high efficiency as a diffusion barrier against the interdiffusion of Al and Si [1,5]. Stoichiometric TiO spontaneously indicates 15% vacancies in an approximated one-to-one ratio, and the vacancy ordered structure is thermodynamically favoured regarding the undefective solid [4,6].…”

“…Stoichiometric TiO spontaneously indicates 15% vacancies in an approximated one-to-one ratio, and the vacancy ordered structure is thermodynamically favoured regarding the undefective solid [4,6]. Besides, the optical property of TiO has received increasing attention for investigating the light absorption properties of blue titanium suboxide nanoparticles in the visible light range [5,7]. Nathalie Herlin-Boime et al [8] synthesized TiO nanoparticles with a rock-salt crystallographic structure, which shows a very large shift of the light absorption threshold (up to 1.2 eV toward visible range) compared to titanium dioxide (anatase grade).…”