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    Wyświetlanie 1-3 z 3
    Tytuł:
    Signal processing for time resolved photoluminescence spectroscopy
    Autorzy:
    Grodecki, Kacper
    Murawski, Krzysztof
    Rutkowski, Jarosław
    Kowalewski, Andrzej
    Sobieski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/1818197.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    epitaxy
    HgCdTe
    photoluminescence
    time-resolved photoluminescence
    Opis:
    Accurate determination of material parameters, such as carrier lifetimes and defect activation energy, is a significant problem in the technology of infrared detectors. Among many different techniques, using the time resolved photoluminescence spectroscopy allows to determine the narrow energy gap materials, as well as their time dynamics. In this technique, it is possible to observe time dynamics of all processes in the measured sample as in a streak camera. In this article, the signal processing for the above technique for Hg1-xCdxTe with a composition x of about 0.3 which plays an extremely important role in the mid-infrared is presented. Machine learning algorithms based on the independent components analysis were used to determine components of the analyzed data series. Two different filtering techniques were investigated. In the article, it is shown how to reduce noise using the independent components analysis and what are the advantages, as well as disadvantages, of selected methods of the independent components analysis filtering. The proposed method might allow to distinguish, based on the analysis of photoluminescence spectra, the location of typical defect levels in HgCdTe described in the literature.
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 91--96
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signal processing for time resolved photoluminescence spectroscopy
    Autorzy:
    Grodecki, Kacper
    Murawski, Kkrzysztor
    Rutkowski, Jarosław
    Kowalewski, Andrzej
    Sobieski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/1818200.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    epitaxy
    HgCdTe
    photoluminescence
    time-resolved photoluminescence
    Opis:
    Accurate determination of material parameters, such as carrier lifetimes and defect activation energy, is a significant problem in the technology of infrared detectors. Among many different techniques, using the time resolved photoluminescence spectroscopy allows to determine the narrow energy gap materials, as well as their time dynamics. In this technique, it is possible to observe time dynamics of all processes in the measured sample as in a streak camera. In this article, the signal processing for the above technique for Hg1-xCdxTe with a composition x of about 0.3 which plays an extremely important role in the mid-infrared is presented. Machine learning algorithms based on the independent components analysis were used to determine components of the analyzed data series. Two different filtering techniques were investigated. In the article, it is shown how to reduce noise using the independent components analysis and what are the advantages, as well as disadvantages, of selected methods of the independent components analysis filtering. The proposed method might allow to distinguish, based on the analysis of photoluminescence spectra, the location of typical defect levels in HgCdTe described in the literature.
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 91--96
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    InAs light-to-heavy hole effective mass ratio determined experimentally from mobility spectrum analysis
    Autorzy:
    Wróbel, Jarosław
    Umana-Membreno, Gilberto A.
    Boguski, Jacek
    Złotnik, Sebastian
    Kowalewski, Andrzej
    Moszczyński, Paweł
    Antoszewski, Jarek
    Faraone, Lorenzo
    Wróbel, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2204210.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    indium arsenide
    effective masses
    energy band warping
    magnetotransport
    mobility spectrum analysis
    Opis:
    Careful selection of the physical model of the material for a specific doping and selected operating temperatures is a non-trivial task. In numerical simulations that optimize practical devices such as detectors or lasers architecture, this challenge can be very difficult. However, even for such a well-known material as a 5 μm thick layer of indium arsenide on a semiinsulating gallium arsenide substrate, choosing a realistic set of band structure parameters for valence bands is remarkable. Here, the authors test the applicability range of various models of the valence band geometry, using a series of InAs samples with varying levels of p-type doping. Carefully prepared and pretested the van der Pauw geometry samples have been used for magneto-transport data acquisition in the 20-300 K temperature range and magnetic fields up to ±15 T, combined with a mobility spectra analysis. It was shown that in a degenerate statistic regime, temperature trends of mobility for heavy- and light-holes are uncorrelated. It has also been shown that parameters of the valence band effective masses with warping effect inclusion should be used for selected acceptor dopant levels and range of temperatures.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144567
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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