Plenary Lecture

Electrophysical and Optical Investigation of Cd1-XMnXTe Epitaxial Thin Films

Associate Professor Matanat Mehrabova
Head of the Department
Institute of Radiation Problems
Azerbaijan National Academy of Sciences
Baku, Azerbaijan
International Academy of Ecology and Life Protection Sciences

Abstract: In recent years small-size semiconductor materials have become an extensive research object of scientists all over the world. Small-size semiconductors of new generation are successfully applied in microelectronics, spintronics, optoelectronics, integral optics, astrophysics, medicine and other fields. One of these semiconductor materials is Cd1-xMnxTe SMS epitaxial thin films which are considered to be very perspective and unique for making optical isolators, solar cells as well as infrared, gamma, x-ray and magnetic field detectors. Cd1-xMnxTe SMS epitaxial thin layers have been studied less in comparison with other semiconductors, therefore obtain of their perfect samples with high crystal perfection, clean and glossy surface, study of surface morphology and crystal structure and research of its application perspectives in device-making is one of the scientific problems and of great importance. It should be mentioned that, the feature that makes these materials unique is their wide band-gap and being highly photosensitive at room temperature, so that it enables the devices to be produced on their base, to work in short wave range and at room temperature.
In this work Cd1-xMnxTe (0,01≤x≤0,05) epitaxial thin films have been grown on different substrates in a vacuum 10-5Pa by molecular beam condensation method. It have been studied their crystal structure and surface morphology. The electrophysical and optical parameters of Cd1-xMnxTe (0,01≤x≤0,05) epitaxial thin films have been investigated. It has been defined, that by increasing of Mn concentration maximum of photoconductivity shifted to short wavelength. The band gap width increases as the value of x increases in the content.

Brief Biography of the Speaker: M. Mehrabova graduated from the Department of Physics on the speciality “Physics of Solid States” of Baku State University, Azerbaijan in 1986. At the end of 1980s she worked in the Institute of Space Researches as an engineer and post graduate student (1988-1991). In 1992 she got degree of Ph.D in physics-mathematics, in 2011 associate professor, then professor of International Ecoenergy Academy and Academician of the International Academy of Ecology and Life Protection Sciences (Russia). Now she works in the Institute of Radiation Problems as head of “International Projects and Information Department” and head of the “Radiation physics of nanosized semiconductor materials” qroup.
Her scientific activity includes Physics of Solid States, Physics of Semiconductors, Radiative study of Materials, Radioecology, Biophysics and so on. M.Mehrabova first calculated the energy spectrum and the electron wave function for Pb1-xMnxTe and Cd1-xMnxTe SMS and their size-quantized thin films and studied Faraday effect on the base of the obtained results. She studied theoretically the processes of generation of local levels in the electronic structure of A3B6 lamellar crystals under the effect of ionizing radiation and their elimination. In order to provide the effectiveness of operating mode of the photodetectors made on the base of those semiconductors she studied the problems of selecting optimal values of their parameters taking into consideration their photoelectrical properties. She calculated the threshold energy, bias energy, the cross-section of electron scattering and the number of primary defects during radiation effect on those semiconductors. She is author of about 100 papers published in international journals and conference proceedings.
She study the influence of ionizing and non-ionizing radiation on animals, plants, human-beings and crystals. She works on the problem of making radiation- and photodetectors, solar cells. She works now in some projects which deal with ecology problems, radiation physics and clean energy.
M.Mehrabova was the winner of the International Project of “Young Scientists of Azerbaijan” in 2003 and was awarded by International Diploma of “Young Scientists of XXI century”. She received STCU certificate of chief specialist on technology commercialization in 2008. Her materials on innovative technologies of IRP ANAS were printed in International Journals such as “Materials and Coatings for Extreme Environments”, “Science Opportunities in Azerbaijan” published on the initiative of STCU in 2009. M.Mehrabova is the member of “Technology Transfer Center” of ANAS.

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