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    Wyświetlanie 1-4 z 4
    Tytuł:
    Measurement of Pulsed Current-Voltage Characteristics of AlGaN/GaN HEMTs from Room Temperature to~15~K
    Autorzy:
    Laurent, T.
    Sharma, R.
    Torres, J.
    Nouvel, P.
    Blin, S.
    Palermo, C.
    Varani, L.
    Cordier, Y.
    Chmielowska, M.
    Faurie,, J.
    Beaumont, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505650.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    73.21.Fg
    73.40.-c
    Opis:
    We report measurements of the pulsed and dc current-voltage characteristics of AlGaN/GaN high-electron-mobility transistors as functions of geometry, temperature (from 300 down to 15 K), and operating conditions. An increase in the drain current with shortening of the pulse width from 1 μs to 400 ns is found to be significant at room temperature whilst this behavior is inverted or even removed at 77 and 15 K temperatures.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 196-198
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonstandard Absorption on Donors in Uniformly Doped II-VI 0D Structures
    Autorzy:
    Karpierz, K.
    Szot, M.
    Grynberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047383.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    72.15.Rn
    72.80.Ey
    73.21.Fg
    Opis:
    The new approach to the understanding of intrashallow donor transition in the reduced dimensionality systems is presented. The magnetospectroscopy experiments done on the CdTe/CdMgTe quantum well based samples, uniformly n-doped, show indications that the surprising lack of spectral sensitivity on applied photon energy can be understood as a result of sample response coming from its different regions. This "non spectroscopic" behaviour (in a sense of the Zeeman splitting) is a consequence of the properties of systems with reduced dimensionality where variety of centre locations in the structure results in continuous density of states available for absorption.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 237-241
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Electric In-Plane Potential Fluctuations in the CdTe/CdMgTe Based Multiple Quantum Wells
    Autorzy:
    Nogajewski, K.
    Karpierz, K.
    Łusakowski, J.
    Grynberg, M.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811966.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    72.15.Rn
    72.80.Ey
    73.21.Fg
    Opis:
    Unusual features in the magnetophotoconductivity spectra registered under far infrared illumination of the CdTe/CdMgTe based multiple quantum wells, uniformly n-doped are presented. It is shown that each spectrum exhibits one or two peaks of non-symmetrical shape, with position of their maxima dependent on the voltage applied to the sample. The peaks, observed in the configuration of the crossed electric and magnetic fields, are strongly shifted by a relatively weak in-plane electric field - of the order of 10-50 V/cm. Two different approaches to explain the observed influence are presented. Both are based on a two-step process leading to the photoconductivity signal. The first approach assumes that only the process of photon absorption is influenced by the external fields, the second one assumes that only the process of phonon assisted electron transfer from the excited donor state into the conduction band is influenced by the external fields.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1259-1265
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Nature of Potential Fluctuations in the MBE CdTe/CdMgTe Quantum Well in a Magnetic Field: Experiment and Theory
    Autorzy:
    Szot, M.
    Karpierz, K.
    Avetisyan, A. A.
    Djotyan, A. P.
    Kossut, J.
    Grynberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047014.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    72.15.Rn
    72.80.Ey
    73.21.Fg
    Opis:
    Far infrared photoconductivity spectra of CdTe/Cd$\text{}_{0.8}$Mg$\text{}_{0.2}$Te quantum well uniformly n-type doped with iodine in barriers and in the well were investigated as a function of the magnetic field. The spectra were recorded for several fixed far infrared photon energies and peaks corresponding to intra donor transitions were observed. The magnetic field at which the peaks were observed was the same for all far infrared photon energies used. This is interpreted as an evidence of the presence of fluctuations of the electrostatic potential - quantum dots which reduce the dimensionality of the potential in which a shallow donor is placed. A characteristic size of the fluctuations was found to be of 23-25 nm and 30-40 nm. Theoretical calculations show a nonmonotonic dependence of the electron binding energy on the donor centre in such quantum dot, as a function of magnetic field. This explains why the position of experimentally observed peak is insensitive to far infrared photon energy used. Temperature evolution of spectra and the theoretical model proposed, indicate similarities between fluctuations in the two-dimensional structure investigated and fluctuations in bulk systems.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 379-387
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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