Монокристаллы халькогенидов для полупроводниковых детекторов нейтронного излучения

Translated title of the contribution: Chalcogenide single crystals for semiconductor neutron radiation detectors

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, new chalcogenide lithium-containing crystals designed for promising semiconductor neutron radiation detectors were investigated. The conditions for the synthesis and growth of LiInSe2, and LiGa0.5In0.5Se2 crystals have been optimized. The growth of LiInSe2, LiGa0.5In0.5Se2 crystals was carried out by the Bridgman - Stockbarger method in the vertical version. A complicating circumstance was the fact that above the melting point a process of incongruent evaporation of compounds is observed, components with a high partial pressure Ga(In)2Se3 migrate from the melt to the free cavity of the ampoules. In order to prevent the deviation from the stoichiometric composition of the crystal, an excessive pressure Ar was created in the ampoules. The grown crystals reached a diameter of 20 mm with a length of up to 50 mm. Volt-ampere characteristics and amplitude signals under irradiation of semiconductors with thermal and fast neutrons were studied, the electrical resistance values of crystals were obtained in the range from 1011 to 1012 ohms. Characterization of the grown crystals was carried out by optical spectroscopy. Band gap estimated. The photoluminescence (PL) spectra of crystal LiGa0.5In0.5Se2 obtained at 80 K by light upon excitation by photons with energies of 3.1, 2.75 and 2.48 eV (400, 450 and 500 nm, respectively) demonstrate emission in two main ranges of 1.5 ÷ 2.0 eV and 1.1 ÷ 1.4 eV
Translated title of the contributionChalcogenide single crystals for semiconductor neutron radiation detectors
Original languageRussian
Article number2
Pages (from-to)16-21
Number of pages6
JournalФундаментальные проблемы современного материаловедения
Volume16
Issue number1
DOIs
Publication statusPublished - 2019

OECD FOS+WOS

  • 2.05 MATERIALS ENGINEERING
  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY

State classification of scientific and technological information

  • 29.31 Optics

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