Search

Your search keyword '"Michał Kochański"' showing total 4 results
Start Over Author "Michał Kochański"
4 results on '"Michał Kochański"'

1. Bridgman-Grown (Cd,Mn)Te and (Cd,Mn)(Te,Se): A Comparison of Suitability for X and Gamma Detectors

Author

Aneta Masłowska, Dominika M. Kochanowska, Adrian Sulich, Jaroslaw Z. Domagala, Marcin Dopierała, Michał Kochański, Michał Szot, Witold Chromiński, and Andrzej Mycielski

Subjects
annealing, crystal growth, photoluminescence, X-ray and gamma-ray detectors, X-ray diffraction, XRD, Chemical technology, TP1-1185
Abstract

This study explores the suitability of (Cd,Mn)Te and (Cd,Mn)(Te,Se) as room-temperature X-ray and gamma-ray detector materials, grown using the Bridgman method. The investigation compares their crystal structure, mechanical and optical properties, and radiation detection capabilities. Both crystals can yield large-area single crystal samples measuring approximately 30 × 30 mm2. In low-temperature photoluminescence analysis, both materials showed defect states, and annealing in cadmium vapors effectively eliminated donor–acceptor pair luminescence in (Cd,Mn)Te but not in (Cd,Mn)(Te,Se). Moreover, harder (Cd,Mn)(Te,Se) exhibited a higher etch pit density compared to softer (Cd,Mn)Te. X-ray diffraction examination revealed uniform lattice constant distribution in both compounds, with variations at a part per million level. (Cd,Mn)Te crystals demonstrated excellent single crystal properties with narrower omega scan widths, while (Cd,Mn)(Te,Se) exhibited a high contribution of block-like structures with significantly larger misorientation angles. Spectroscopic evaluations revealed better performance of a pixelated (Cd,Mn)Te detector, in comparison to (Cd,Mn)(Te,Se), achieving a mean full width at half maximum of 14% for the 122 keV gamma peak of Co-57. The reduced performance of the (Cd,Mn)(Te,Se) detector may be attributed to deep trap-related luminescence or block-like structures with larger misorientation angles. In conclusion, Bridgman-grown (Cd,Mn)Te emerges as a more promising material for X-ray and gamma-ray detectors when compared to (Cd,Mn)(Te,Se).

Published
2024
Full Text
View/download PDF

3. CdTe-based crystals with Mg, Se, or Mn as materials for X and gamma ray detectors: Selected physical properties

Author

Michał Kochański, Marcin Dopierała, M. Górska, Anna Reszka, Aneta Wardak, D. Kochanowska, Andrzej Mycielski, Witold Chrominski, Bartlomiej S. Witkowski, Jaroslaw Z. Domagala, Rafal Jakiela, M. Witkowska-Baran, Małgorzata Lewandowska, B. Witkowska, Leszek Kowalczyk, Adam Marciniak, Elżbieta Łusakowska, A. Avdonin, Michał Szot, and Gabriela Janusz

Subjects
Materials science, Magnesium, Analytical chemistry, chemistry.chemical_element, Manganese, Condensed Matter Physics, Particle detector, Cadmium telluride photovoltaics, law.invention, chemistry, law, Gamma ray detectors, General Materials Science, Crystallization, Tellurium, Selenium
Abstract

In recent years, a series of investigations has been devoted to a possibility of using crystals based on CdTe with addition of magnesium (Mg), selenium (Se), or manganese (Mn) for X and gamma radiation detectors. In the literature there are contradictory data with respect to the segregation of Mg in (Cd,Mg)Te and Se in Cd(Te,Se) and to the possibility of obtaining materials with a homogeneous composition without grains and twins. We have wide technological possibilities of preparing crystals and investigating some of their properties. Thus, we performed crystallizations of (Cd,Mg)Te, Cd(Te,Se), (Cd,Mn)(Te,Se), and (Cd,Mn)Te compounds. The aim of our studies was to check whether any of the investigated materials may be easily obtained by the Low Pressure Bridgman (LPB) method in the form of large, homogeneous, high resistivity single crystals with as few as possible twins, subgrains, and tellurium inclusions. The crystallization processes were performed by using the LPB method. The elements used: Cd, Te, Mn, Mg, and Se were of the highest purity available at that time. In order to obtain reliable conclusions the crystallization processes were carried out under identical technological conditions. The details of our technological method and the results of the investigation of physical properties of the samples are presented below.

Published
2021
Full Text
View/download PDF

4. Solubility limits of vanadium in CdTe and (Cd,Mn)Te crystals

Author

Michał Kochański, B. Witkowska, Marcin Dopierała, Aneta Wardak, Rafal Jakiela, M. Witkowska-Baran, Adam Marciniak, Gabriela Janusz, D. Kochanowska, and Andrzej Mycielski

Subjects
010302 applied physics, Materials science, Doping, Analytical chemistry, Vanadium, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Cadmium telluride photovoltaics, Inorganic Chemistry, Secondary ion mass spectrometry, Linear relationship, chemistry, 0103 physical sciences, Materials Chemistry, Solubility, 0210 nano-technology
Abstract

The aim of this study is to establish the measured concentration of vanadium actually present in the doped crystals as a function of the vanadium concentration determined on the basis of its amount introduced into our (Cd,Mn)Te and CdTe crystals during the growth process. For (Cd,Mn)Te the expected concentration of vanadium varied from 1014 cm−3 to 1020 cm−3. The measurements were performed using the Secondary Ion Mass Spectrometry (SIMS). The measured results for vanadium concentrations from 1014 cm−3 to 3 × 1018 cm−3 differ from the intended ones by not more than a factor of 2 and exhibit the linear relationship. For concentrations above 3 × 1018 cm−3 the measured vanadium concentrations are lower than the nominal ones by more than a factor of 10.

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results