Registration Number
0224U003077,
0121U112421
, R & D reports
Title
Radiation-resistant materials for ionizing and IR radiation detection
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Head
Fochuk Petro M., д.х.н.
Registration Date
03-04-2024
Organization
Yuriy Fedkovych Chernivtsi National University
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The object of the research is the development of methods for growing Cd(Mn,Se)Te (CMST), CsPbX3 (X=Cl, Br, I) and (Hg,Mn)3In2Te6 (MIT) crystals by crystallization from the melt and creating detectors based on them.
The purpose of the work is the regularities of the melting and crystallization processes of materials in dynamic and quasi-static conditions, the influence of growing conditions, and isovalent substitution on the properties of the obtained crystals.
Research methods – experimental optical, low-temperature electrical measurements, differential thermal analysis, IR microscopy, gamma spectroscopy.
As part of the project, technologies for growing Cd(Mn,Se)Te, CsPbBr3, and (Hg,Mn)3In2Te6 crystals with the properties necessary for creating radiation-resistant detectors based on them have been improved.
The patterns of melting and crystallization of the completely inorganic perovskite CsPbBr3 by the DTA method with different heating/cooling rates (0.1, 1, 3, 5, and 10 K/min) and the effect of the maximum sample heating temperature on melt crystallization were investigated. A two-stage mechanism of the heating process of CsPbBr3 is proposed and a "critical" heating temperature is determined, above which the heating process is accompanied by significant supercooling. Using data from DTA thermograms, the heating activation energy and crystallization processes of CsPbBr3 were estimated as 1850 kJ/mol and 1940 kJ/mol.
With the help of DTA, the optimal technological conditions of the ingot growing process were selected. The structural, electrical, optical, and detector properties of the obtained samples were studied, depending on the growing conditions and subsequent heat treatment, which made it possible to determine the optimal conditions for ensuring the desired characteristics of the materials. The treatment of the surface of the crystals has been improved and the influence of the type/material of the contact and the methods of its creation has been studied.
Product Description
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Kopach Oleh V.
Pylypko Viktoriia H.
Skliarchuk Valerii M.
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2024-04-03
