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    Wyświetlanie 1-7 z 7
    Tytuł:
    Technology of Ultrathin NbN and NbTiN Films for Superconducting Photodetectors
    Autorzy:
    Guziewicz, M.
    Slysz, W.
    Borysiewicz, M.
    Kruszka, R.
    Sidor, Z.
    Juchniewicz, M.
    Golaszewska, K.
    Domagala, J.
    Rzodkiewicz, W.
    Ratajczak, J.
    Bar, J.
    Wegrzecki, M.
    Sobolewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492719.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.Bf
    74.78.-w
    81.15.Cd
    81.15.Jj
    Opis:
    We report fabrication and characterization of ultrathin NbN and NbTiN films designed for superconducting photodetectors. Our NbN and NbTiN films were deposited on $Al_2O_3$ and Si single-crystal wafers by a high-temperature, reactive magnetron sputtering method and, subsequently, annealed at 1000°C. The best, 18 nm thick NbN films deposited on sapphire exhibited the critical temperature of 15.0 K and the critical current density as high as ≈ 8 × $10^6$ A/$cm^2$ at 4.8 K.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-076-A-079
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrathin NbN Films for Superconducting Single-Photon Detectors
    Autorzy:
    Słysz, W.
    Guziewicz, M.
    Borysiewicz, M.
    Domagała, J.
    Pasternak, I.
    Hejduk, K.
    Rzodkiewicz, W.
    Ratajczak, J.
    Bar, J.
    Węgrzecki, M.
    Grabiec, P.
    Grodecki, R.
    Węgrzecka, I.
    Sobolewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504147.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.Bf
    74.78.-w
    81.15.Cd
    81.15.Jj
    Opis:
    We present our research on fabrication and structural and transport characterization of ultrathin superconducting NbN layers deposited on both single-crystal $Al_2O_3$ and Si wafers, and $SiO_2$ and $Si_3N_4$ buffer layers grown directly on Si wafers. The thicknesses of our films varied from 6 nm to 50 nm and they were grown using reactive RF magnetron sputtering on substrates maintained at the temperature 850°C. We have performed extensive morphology characterization of our films using the X-ray diffraction method and atomic force microscopy, and related the results to the type of the substrate used for the film deposition. Our transport measurements showed that even the thinnest, 6 nm thick NbN films had the superconducting critical temperature of 10-12 K, which was increased to 14 K for thicker films.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 200-203
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Properties of Amorphous Zinc Oxynitride Thin Films
    Autorzy:
    Kaczmarski, J.
    Borysiewicz, M.
    Pągowska, K.
    Kamińska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398691.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Gc
    81.15.Cd
    72.80.Ng
    73.61.Jc
    Opis:
    Zn-O-N thin films fabricated by reactive radio frequency magnetron sputtering have been investigated for their compositional, structural, transport and optical properties. In contrast to processes in which the reaction for either the oxide or the nitride is dominant, the multireaction process yields a substantially amorphous films with the Hall mobility within the range from 15 to 80 cm²/(V s). In addition, it has been observed that the Hall mobility increases for Zn-O-N. Since it has a narrower bandgap than ZnO, it is put forward that the high mobility is due to the valence band maximum in this material lying above the trap states in the gap commonly observable in ZnO. These traps originate from oxygen vacancies and are localized at the bottom of the band gap influencing the carrier mobility.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 150-152
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Quality Gate Insulator/GaN Interface for Enhancement-Mode Field Effect Transistor
    Autorzy:
    Taube, A.
    Kruszka, R.
    Borysiewicz, M.
    Gierałtowska, S.
    Kamińska, E.
    Piotrowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492515.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.55.dj
    77.22.Ch
    73.40.Qv
    81.15.Gh
    81.15.Cd
    Opis:
    The capacitance-voltage measurements were applied for characterization of the semiconductor/dielectric interface of GaN MOS capacitors with $SiO_2$ and $HfO_2//SiO_2$ gate stacks. From the Terman method low density of interface traps $(D_{it} \approx 10^{11} eV^{-1} cm^{-2})$ at $SiO_2//GaN$ interface was calculated for as-deposited samples. Samples with $HfO_2//SiO_2$ gate stacks have higher density of interface traps as well as higher density of mobile charge and effective charge in the dielectric layers. High quality of $SiO_2//GaN$ interface shows applicability of $SiO_2$ as a gate dielectric in GaN MOSFET transistors.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-022-A-024
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dye aggregation influence on dye sensitized solar cell performance in nanocoral ZnO-based thin film cells sensitized with N-719 and rose bengal dyes
    Autorzy:
    Borysiewicz, M.
    Chusnutdinow, S.
    Wzorek, M.
    Wojciechowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058779.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.60.Jt
    81.15.Cd
    68.35.bg
    68.55.ag
    Opis:
    Dye sensitized solar cells were fabricated using ZnO nanostructured photoelectrodes sensitized with N-719 or Rose Bengal dyes. We assessed the device performance as a function of the sensitization time and found a dependence on time for the N-719 and no significant changes for the Rose Bengal. Furthermore, we observe that the structure of the N-719 molecule beneficial for sensitization of TiO₂ may lead to the degradation of the ZnO crystals and a growth of an amorphous shell limiting dye performance in the cells.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1187-1189
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tuning Transparent Supercapacitor Performance by Controlling the Morphology of its ZnO Electrodes
    Autorzy:
    Borysiewicz, M.
    Wzorek, M.
    Ekielski, M.
    Kaczmarski, J.
    Wojciechowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032336.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Uv
    68.35.bg
    68.55.ag
    81.15.Cd
    Opis:
    Transparent supercapacitors were fabricated using nanostructures ZnO electrodes deposited using reactive magnetron sputtering. By fine tuning the deposition process parameters the electrodes with different morphologies were obtained, from hierarchical through sponge-like to nanocolumnar. The device performance related to the electrode morphology was assessed. It was found that the nanocolumnar electrodes provided best performance both in terms of effective device capacitance (18.3 μF/cm²) and transparency ( ≈ 100% in the visible range). The worst performance, with 80% lower effective capacitance, was obtained in the devices with the sponge-like morphology.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1550-1553
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Porous Zn Growth Mechanism during Zn Reactive Sputter Deposition
    Autorzy:
    Borysiewicz, M.
    Wojciechowski, T.
    Dynowska, E.
    Kamińska, E.
    Piotrowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198573.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.70.-m
    81.15.Cd
    77.55.hf
    81.10.Pq
    52.27.Cm
    Opis:
    Ar-O-Zn plasma discharges created during DC reactive magnetron sputtering of a Zn target and RF reactive magnetron sputtering of a ceramic ZnO target were investigated and compared by means of the Langmuir probe measurements in order to determine the mechanism of growth of porous Zn films during DC-mode Zn reactive sputtering. The power supplied to the magnetrons during the sputtering was kept at 125 W and the plasma was characterised as a function of oxygen content in the sputtering gas mixture, ranging from 0 to 60% for two gas pressures related to porous Zn film deposition, namely 3 mTorr and 5 mTorr. Based on the correlation of plasma properties measurements with scanning electron microscope imaging and X-ray diffraction of the films deposited under selected conditions it was found that the growth of porous, polycrystalline Zn films was governed by high electron density in the plasma combined with a high electron temperature and an increased energy of the ions impinging on the substrate.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1144-1148
    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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