Temperature-Dependent Structural Transition, Electronic Properties and Impedance Spectroscopy Analysis of Tl<sub>2</Sub>ingas<sub>4< Crystals Grown by the Bridgman Method
No Thumbnail Available
Date
2018
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Sci Ltd
Open Access Color
OpenAIRE Downloads
OpenAIRE Views
Abstract
In this work, we report the temporary structural modifications associated with the in situ heating of the Tl2InGaS4 crystals in the temperature range of 300-420 K. The analysis of the X-ray diffraction patterns revealed the temperature-independent possible phase transformations between the monoclinic and triclinic phases. The temperature analysis of the lattice parameters, crystallite size, strain, dislocation density and stacking faults has shown a temporary enhancement in the crystallinity of this compound above 375 K. Significant increase in the grain size accompanied to decrease in the strain, defect density and stacking faults was observed above this temperature. The scanning electron microscopy imaging has shown that the crystals are layer structured with high quality layers of thicknesses of similar to 12 nm. In addition the energy dispersive X-ray analysis has shown that the crystal comprise no detectable impurity. Moreover, the room temperature optical characterizations has shown that the Tl2InGaS4 exhibit an energy band gap of 2.5 eV. The temperature dependent electrical resistivity measurements indicated highly resistive crystal with activation energy values of 0.84 and 0.19 eV above and below 375 K, respectively. On the other hand, room temperature impedance spectroscopy analysis in the frequency domain of 10-1800 MHz has shown that the crystal exhibits negative resistance and negative capacitance effects below and above 1580 MHz. The crystals are observed also to behave as band stop filter with notch frequency of 1711 MHz.
Description
Gasanly, Nizami/0000-0002-3199-6686; Qasrawi, Atef Fayez/0000-0001-8193-6975; Gasanly, Nizami/0000-0002-3199-6686
Keywords
Deformation, Defects in solids, Recrystallization, Strain, Negative capacitance
Turkish CoHE Thesis Center URL
Fields of Science
Citation
7
WoS Q
Q2
Scopus Q
Q1
Source
Volume
84
Issue
Start Page
76
End Page
82