Photoinduced Optical Properties Of Tl1−xIn1−xSixSe2 Single Crystals

Archives of Metallurgy and Materials

L.V. Piskach¹  O.V. Parasyuk¹  A.O. Fedorchuk²  O.V. Zamurueva³  G.L. Myronchuk³  I.V. Kityk⁴  K. Oźga⁴  M. Szota⁵  A.M. El-Naggar⁶  A.A. Albassam⁶  N.S. Alzayed⁶ 

[1] DEPARTMENT OF INORGANIC AND ORGANIC CHEMISTRY, EASTERN EUROPEAN NATIONAL UNIVERSITY, 13 VOLI AVE., 43025 LUTSK, UKRAINE;DEPARTMENT OF INORGANIC AND ORGANIC CHEMISTRY, LVIV NATIONAL UNIVERSITY OF VETERINARY MEDICINE AND BIOTECHNOLOGIES, 50 PEKARSKA STR., 79010 LVIV, UKRAINE;DEPARTMENT OF SOLID STATE PHYSICS, EASTERN EUROPEAN NATIONAL UNIVERSITY, 13 VOLI AVE., 43025 LUTSK, UKRAINE;INSTITUTE OF ELECTRONIC AND CONTROL SYSTEM, CZESTOCHOWA UNIVERSITY OF TECHNOLOGY, 17 ARMII KRAJOWEJ STR., 42-200 CZESTOCHOWA, POLAND;INSTITUTE OF MATERIAL SCIENCE ENGINEERING, CZESTOCHOWA UNIVERSITY OF TECHNOLOGY, 19 ARMII KRAJOWEJ STR., 42-200 CZESTOCHOWA, POLAND;RESEARCH CHAIR OF RENEWABLE ENERGYAPPLICATIONSPHYSICS AND ASTRONOMY DEPARTMENT, COLLEGE OF SCIENCE, KING SAUDI UNIVERSITY, P.O. BOX 2455, RIYADH 11451, SAUDI ARABIA

关键词: Keywords: Tl1−xIn1−xSixSe2 single crystal;    chalcogenide crystals;    optical properties;    photoinduced absorption;    dark electroconductivity;    electroconductivity mechanisms;   

DOI  :  10.1515/amm-2015-0258

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The influence of temperature on electroconductivity and photoinduced changes of the absorption at 0.15 eV under influence of the second harmonic generation of CO2 laser for the two type of single crystals were investigated. The single crystals Tl1−xIn1−xSixSe2 (x=0.1 and 0.2) have been grown by the two-zone Bridgaman-Stockbarger method. The temperature studies of electroconductivity were done in cryostat with thermoregulation in the temperature 77 - 300 K, with stabilization ±0.1 K. Photoinduced treatment of the investigated single crystals were performed using the 180 ns pulses second harmonic generation of the CO2 laser operating at 5.3 μm. Experimental studies have shown that for the Tl1−xIn1−xSixSe2 single crystals with decreasing temperature from 300 up to 240 K and from 315 up to 270 K the conductivity is realized by thermally excited impurities with activation energies equal to about 0.24 eV and 0.22 eV for x= 0.1 and 0.2, respectively. Photoinduced absorption achieves its maximum at a power density below 100 mJ/cm2. Has been shown that the samples with x=0.2 demonstrated higher changes of the photoinduced absorption with respect to the x=0.1. With further decreasing temperature is observed monotonic decrease in the activation energy of conductivity. The origin of these effects is caused by the excitations of both the electronic as well as phonon subsystem. At some power densities the anharmonic excitations become dominant and as a consequence the photoinduced absorption dependence is saturated what were observed. Additionally, we were evaluated at given temperature the average jump length of R for localized states near Fermi level.

【 授权许可】

Unknown