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    Wyświetlanie 1-7 z 7
    Tytuł:
    Synthesis of PbTiO₃ Thin Films by Annealing Multilayer Oxide Structures in Vacuum
    Autorzy:
    Iljinas, A.
    Stankus, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398677.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    68.55.-a
    Opis:
    This article presents investigation of syntheses of perovskite PbTiO₃ thin films by using reactive magnetron layer-by-layer deposition on Si (100) substrate and post-annealing in air and vacuum $(p=5 \times 10^{-3} Pa)$. The film stoichiometry was accurately controlled by the deposition of individual layers with the required ( ≈1 nm) thickness, using the substrate periodic moving over targets. Deposited thin films were annealed in air and in vacuum at 670°C and 770°C for 1 h, respectively. The morphological, structural, and chemical properties of thin films deposited at 300°C substrate temperature and post-annealed thin films using either conventional annealing and thermal annealing in vacuum at different temperatures were investigated and compared between. X-ray diffraction measurements of thin films annealed in air show formed crystalline perovskite PbTiO₃ phase with tetragonality c/a=1.047. The crystallite size of oxidized films depends on the substrate temperature. The structure of post annealed in vacuum thin films strongly depends on Pb/Ti atomic ratio. It was observed that the best structure and morphology forms when atomic ratio of Pb/Ti was 0.80. Pseudocubic phase of lead titanate forms with sufficiently low tetragonality at 670°C temperature.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 121-124
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of RF Power on Electrical and Structural Properties of Sputtered $SnO_2$:Sb Thin Films
    Autorzy:
    Cevher, O.
    Guler, M.
    Tocoglu, U.
    Cetinkaya, T.
    Akbulut, H.
    Okumus, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218075.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    68.55.ag
    81.15.Cd
    Opis:
    In this work, antimony doped tin oxide ($SnO_2$:Sb) thin films were fabricated using a radio frequency magnetron sputtering system on Si wafer and glass substrates. The base pressure in the sputtering chamber was 1.0 Pa. The $SnO_2$:Sb thin films were deposited for 1.0 h in a mixture of Ar and $O_2$ environment with $O_2$/Ar ratio of 10/90 at 75, 100, and 125 W RF sputtering powers. The microstructure of $SnO_2$:Sb thin films was assessed using a field emission scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diffraction. The average surface roughness $(R_{a})$ was measured with atomic force microscopy. The electrical resistivity of the deposited films was measured by the four-point-probe method. The thicknesses of the films were measured by surface profiler.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 293-295
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of Bismuth Oxide Thin Films Deposited by Reactive Magnetron Sputtering
    Autorzy:
    Iljinas, A.
    Burinskas, S.
    Dudonis, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503904.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    68.55.-a
    78.20.-e
    Opis:
    In this work $Bi_2O_3$ thin films were deposited onto the Si (111) and soda lime glass substrates by the reactive direct current magnetron sputtering system using pure Bi as a sputtering target. The dependences of electro-optical characteristics of the films on the substrate type and temperature were investigated. Transmittance and reflectance of the $Bi_2O_3$ films were measured with ultraviolet and visible light spectrometer. It was found that the substrate temperature during deposition has a very strong influence on the phase components of thin films. The results indicate that the direct allowed transitions dominate in the films obtained in this work. For the direct allowed transitions the band gap energy is found to be about 1.98 eV and 2.2 eV. The reflectance of thin bismuth oxide film depends on the substrate. Small transparency of thin films grown on glass is more related to large reflectance than absorption. The reflectance spectra of the bismuth oxide thin films deposited on the Si substrates show higher quality of optical characteristics compared to the samples deposited on glass substrates.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 60-62
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Very Large YBCO Films on Single- and Polycrystalline Substrates
    Autorzy:
    Kinder, H.
    Prusseit, W.
    Semerad, R.
    Utz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964233.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    74.72.-h
    68.55.-a
    Opis:
    High quality YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ thin films on areas of up to 9" in diameter have been grown by reactive thermal co-evaporation using a rotating substrate holder. A scanning inductive j$\text{}_{c}$ probe is used to monitor the homogeneity of critical current densities which are typically greater than 2 MA/cm$\text{}^{2}$. The same technique also allows a double sided deposition for filter applications. Surface resistance values are found to be below 500 μΩ at 10 GHz. On biaxially aligned buffer layers on polycrystalline substrates j$\text{}_{c}$ values of 1.4 MA/cm$\text{}^{2}$ are achieved at 77 K as well. We have also studied the properties of Nd$\text{}_{1-x}$Ba$\text{}_{2+x}$Cu$\text{}_{3}$O$\text{}_{7}$ films grown with the same system.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 47-54
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Plasma Deposition Parameters on the Properties of Ti/TiC Multilayers for Hard Coatings Applications
    Autorzy:
    Saoula, N.
    Henda, K.
    Kesri, R.
    Shrivastava, S.
    Erasmus, R.
    Comins, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490973.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    68.35.Ct
    68.55.-a
    68.37.Ps
    Opis:
    Titanium carbide (TiC) hard coatings have been obtained on steel and silicon substrates by rf magnetron sputtering process. Two layer coatings have been deposited in order to improve adhesion on steel. The lower layer was titanium metal and the upper TiC layer was obtained by reactive sputtering of the titanium target in Ar and methane gas mixture. The study confirmed that the TiC layer composition depends on the reactive sputtering gas composition and substrate bias voltage. Film microhardness was measured by microindentation. Measurement results showed that the hardness coating depends on the microstructure of our coatings and the polarization of bias substrate is an important parameter to control the microstructure.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 172-174
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Structure Densification in $TiO_2$ Coatings Prepared by Magnetron Sputtering under Low Pressure of Oxygen Plasma Discharge
    Autorzy:
    Domaradzki, J.
    Kaczmarek, D.
    Prociow, E.
    Radzimski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503889.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    81.15.-z
    68.55.-a
    81.15.Aa
    Opis:
    Current work presents results of studies on structural and optical properties of the $TiO_2$ thin films prepared by reactive magnetron sputtering. Oxide thin films were deposited from metallic targets using oxygen gas only instead of usually used mixture of Ar-$O_2$. Additionally, an increased amplitude of unipolar pulses powering the magnetron has been applied. It is shown that all prepared coatings were stoichiometric and by changing only the discharge voltage it is possible to influence the resulting structural phase and optical properties of prepared thin films. Depending on conditions of magnetron powering, $TiO_2$ thin films had either the anatase structure with refraction index n = 2.1 (λ = 500 nm) or a high temperature stable rutile structure with n = 2.52 (λ = 500 nm).
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 49-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sponge-like Porous ZnO Photoanodes for Highly Efficient dye-sensitized Solar Cells
    Autorzy:
    Sacco, A.
    Lamberti, A.
    Berardone, I.
    Bianco, S.
    Gazia, R.
    Pugliese, D.
    Quaglio, M.
    Tresso, E.
    Pirri, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399944.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    68.55.A-
    68.55.J-
    81.05.Rm
    72.20.Jv
    72.40.+w
    73.40.Mr
    88.40.H-
    Opis:
    We propose a 3D branched ZnO nanostructure for the fabrication of highly efficient dye-sensitized solar cell photoanodes. A coral-shaped structured Zn layer was deposited by radio frequency magnetron sputtering at room temperature onto fluorine-doped tin oxide/glass sheets and then thermally oxidized in ambient atmosphere, obtaining a high-density branched ZnO film. The porous structure provides a large surface area, and, as a consequence, a high number of adsorption sites, and the size and spacing of the nanostructures (on the order of the exciton diffusion length) are optimal for good electron collection efficiency. The proposed synthesis technique is simple and scalable and the reproducibility of the growth results was tested. The crystalline phase of the film was investigated, evidencing the complete oxidation and the formation of a pure wurtzite crystalline structure. ZnO-based solar harvesters were fabricated in a microfluidic architecture, using conventional sensitizer and electrolyte. The dependence of the cell efficiency on dye incubation time and film thickness was studied with I-V electrical characterization and electrochemical impedance spectroscopy. The obtained conversion efficiency values, with a maximum value of 4.83%, confirm the highly promising properties of this material for the implementation in dye-sensitized solar cell photoanodes.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 386-389
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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