Observation of in situ enhanced crystallization, negative resistance effect and photosensitivity in Tl2InGaSe4 crystals

Qasrawi, A. F.
Irshaid, Tahani M. A.
Hasanlı, Nızamı
In this work, we report the properties of Tl2InGaSe4 crystals as multifunctional material. Namely, Tl2InGaSe4 crystals are grown by the modified Bridgman method using mixtures of TlInSe2 (50%) and TlGaSe2 (50%) single crystals. The enhanced crystallization and structural stabilities are monitored by the X-ray diffraction technique during the in situ heating and cooling cycles. The structural analyses on the Tl2InGaSe4 crystals revealed domination of both of the monoclinic and tetragonal phases in the crystals. In addition, the produced crystals are used to fabricate Schottky diodes. While the scanning electron microscopy has shown that the crystals are composed of layered nanosheets, the electrical analyses have shown that the crystals exhibit light photosensitivity of 12.7 under tungsten light illumination of 10 kLuxes. The attenuation in the electrical parameters of the Ag/Tl2InGaSe4/C diodes presented by series resistance, barrier height and ideality factor upon light excitations make them promising for applications in optoelectronics as switches and photodetectors. Moreover, the alternating electrical signals analyses on the capacitance spectra displayed resonance -antiresonance oscillations in the frequency domain of 83-100 MHz. The resistance spectra also exhibited negative resistance effect in the range of 55-135 MHz. These features of the device make it suitable for use as microwave resonators and memory devices as well.


Investigation of the variations in microstructure and mechanical properties of dual-matrix ductile iron by Magnetic Barkhausen Noise analysis
Gür, Cemil Hakan; Erdogan, Mehmet (Informa UK Limited, 2008-01-01)
The variations in the microstructure and tensile properties of dual-matrix ductile irons have been investigated non-destructively by Magnetic Barkhausen Noise (MBN) method. Specimens have been intercritically austenitised at 795 degrees C and 815 degrees C for 20 minutes, and then oil-quenched to obtain different martensite volume fractions. Two specimens, namely as-cast and oil-quenched from 900 degrees C, were prepared for comparison purpose. To investigate the effect of tempering, some specimens were tem...
Crystal data and indirect optical transitions in Tl2InGaSe4 crystals
QASRAWI, ATEF FAYEZ HASAN; Hasanlı, Nızamı (Elsevier BV, 2008-06-03)
The room temperature crystal data and the optical properties of the Bridgman method grown Tl2InGaSe4 crystals are reported and discussed. The X-ray diffraction technique has revealed that Tl2InGaSe4 is a single phase crystal of monoclinic structure. The unit cell lattice parameters, which were recalculated from the X-ray data, are found to be a = 0.77244 nm, b = 0.64945 nm, c = 0.92205 nm and beta = 95.03 degrees. The temperature dependence of the optical band gap of Tl2InGaSe4 single crystal in the tempera...
Study of the optical and photoelectrical properties of TlGaSeS layered single crystals
Delice, S.; Hasanlı, Nızamı (Elsevier BV, 2017-06-01)
Transmission spectra (7) of TIGaSeS crystals in the photon energy (hv) range 1.38-2.38 eV are used to determine the energy gap. The indirect band gap of 2.30 eV was established employing the photon energy dependence of the first derivative dT/d(hv) and the photon energy dependence of absorption coefficient. In order to obtain information about the defect states in the energy gap of TlGaSeS crystals, photoconductivity (PC) measurements are performed in the 140-300 K range. Photoconductivity spectra in the ph...
Synthesis of zirconium tungstate-zirconia core-shell composite particles
Khazeni, Nasser; MAVİŞ, BORA; Gündüz, Güngör; Colak, Uner (Elsevier BV, 2011-11-01)
In this work, ZrW(2)O(8)-ZrO(2) core-shell composite particles were synthesized. ZrW(2)O(8) that was used in the core is a material with negative coefficient of thermal expansion, and it was synthesized from a high-pH precursor based on use of tungstic acid and zirconium acetate. Shell layer was composed of ZrO(2) nanocrystallites and precipitated from an aqueous solution by urea hydrolysis. While volume of the shell was effectively controlled by the initial zirconium ion concentration in the solutions, the...
Investigation of microstructure-ultrasonic velocity relationship in SiCp-reinforced aluminium metal matrix composites
Gür, Cemil Hakan (Elsevier BV, 2003-11-25)
Twenty-one sets of specimens were fabricated by hot pressing powder mixtures containing various volume and size combinations of pure Al and SiC particles. Neither heat treatment nor secondary deformation processes were applied. The microstructures of the specimens were characterised by optical and scanning electron microscopy. Using a 10 MHz probe, the velocity of ultrasonic longitudinal waves was measured. The results show that in general the ultrasonic velocity increases with an increase in SiC content. H...
Citation Formats
A. F. Qasrawi, T. M. A. Irshaid, and N. Hasanlı, “Observation of in situ enhanced crystallization, negative resistance effect and photosensitivity in Tl2InGaSe4 crystals,” MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/70196.