skip to main content

SciTech ConnectSciTech Connect

Title: Transmission, reflection and thermoluminescence studies on GaS{sub 0.75}Se{sub 0.25} layered single crystals

Highlights: • Optical and thermoluminescence properties of Ga{sub 4}S{sub 3}Se crystals were investigated. • Indirect and direct band gap energies were found as 2.39 and 2.53 eV, respectively. • The activation energy of the trap center was determined as 495 meV. - Abstract: Optical and thermoluminescence properties on GaS{sub 0.75}Se{sub 0.25} crystals were investigated in the present work. Transmission and reflection measurements were performed at room temperature in the wavelength range of 400–1000 nm. Analysis revealed the presence of indirect and direct transitions with band gap energies of 2.39 and 2.53 eV, respectively. TL spectra obtained at low temperatures (10–300 K) exhibited one peak having maximum temperature of 168 K. Observed peak was analyzed using curve fitting, initial rise and peak shape methods to calculate the activation energy of the associated trap center. All applied methods were consistent with the value of 495 meV. Attempt-to-escape-frequency and capture cross section of the trap center were determined using the results of curve fitting. Heating rate dependence studies of the glow curve in the range of 0.4–0.8 K/s resulted with decrease of TL intensity and shift of the peak maximum temperature to higher values.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Department of Physics, Middle East Technical University, 06800 Ankara (Turkey)
  2. Department of Electrical and Electronics Engineering, Atilim University, 06836, Ankara (Turkey)
  3. (Azerbaijan)
Publication Date:
OSTI Identifier:
22475904
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 70; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; CAPTURE; CHALCOGENIDES; CROSS SECTIONS; DEFECTS; GALLIUM COMPOUNDS; GLOW CURVE; HEATING RATE; MONOCRYSTALS; OPTICAL PROPERTIES; REFLECTION; SELENIUM COMPOUNDS; SPECTRA; SULFUR COMPOUNDS; THERMOLUMINESCENCE; TRANSMISSION; TRAPS; WAVELENGTHS