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Far-infrared spectroscopy of CdTe1−xSex(In): Phonon properties
Institution:1. Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;2. Institute of Physics, Polish Academy of Science, 02-668 Warsaw, Poland;1. CIMAP CEA/CNRS/ENSICAEN/UCBN, 6 Blvd. Maréchal Juin, 14050 Caen Cedex 4, France;2. V. Lashkaryov Institute of Semiconductor Physics at NASU, 41 Pr. Nauky, Kyiv 03028, Ukraine;3. Taras Shevchenko National University of Kyiv, Faculty of Physics, 4 Pr. Hlushkov, Kyiv 03022, Ukraine;1. Department of Physical and Inorganic Chemistry, Kaunas University of Technology, Radvilenu str. 19, Kaunas LT-50254, Lithuania;2. Department of Technology, Kaunas University of Technology, Panevezys Faculty, Daukanto 12, 35212 Panevezys, Lithuania;3. Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca Hall, 111 Research Drive, Bethlehem, PA 18015, USA;1. Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK-6), 52428 Jülich, Germany;2. Department of Chemistry, Creighton University, 2500 California Plaza, Omaha NE 68178, USA;3. Department of Chemistry, Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia;4. Institut für Geowissenschaften, Universität zu Kiel, 24118 Kiel, Germany;5. Department of Chemistry and Biochemistry, Florida State University, 102 Varsity Way, Tallahassee, FL 32306-4390, USA;6. Institut für Kristallographie, RWTH Aachen University, 52066 Aachen, Germany;1. Institute of Low Temperature and Structure Research Polish Academy of Sciences, Department of Spectroscopy of Excited States, ul. Okólna 2, 50-422 Wrocław, Poland;2. University of Wrocław, Faculty of Chemistry, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland;1. Laboratory of Physics of Materials and Nanomaterials applied at Environment: LaPhyMNE, Faculty of Sciences in Gabes, Gabes University, Erriadh City, Zrig, 6072 Gabes, Tunisie;2. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;3. Al Imam Mohammad Ibn Saud Islamic University (IMSIU), College of Sciences, Department of Physics, Riyadh 11623, Saudi Arabia;4. Department of Physics, Faculty of Science, Firat University, Elazig 23169, Turkey
Abstract:The far-infrared reflectivity spectra of CdTe0.97Se0.03 and CdTe0.97Se0.03(In) single crystals were measured at different temperatures. The analysis of the far-infrared spectra was carried out by a fitting procedure based on the dielectric function which includes spatial distribution of free carriers as well as their influence on the plasmon–phonon interaction. We found that the long wavelength optical phonon modes of CdTe1xSex mixed crystals exhibit a two-mode behavior. The local In mode at about 160 cm−1 is observed. In both sample, a surface layer with a low concentration of free carriers (depleted region) are formed.
Keywords:Semiconductors  Electron–phonon interactions  Light absorption and reflection
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