Physics of the Solid State
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Effect of heat treatment on optical and electrophysical properties of α-GeTe
Davydov V. Yu. 1, Smirnov A. N. 1, Eliseyev I. A. 1, Sakhno M. K.1, Myasoedov A. V. 1, Pshenay-Severin D. A. 1, Shabaldin A. A. 1, Burkov A. T. 1
1Ioffe Institute, St. Petersburg, Russia
Email: valery.davydov@mail.ioffe.ru, alex.smirnov@mail.ioffe.ru, ilya.eliseyev@mail.ioffe.ru, serpentcase@gmail.com, a.v.myasoedov@mail.ioffe.ru, d.pshenay@mail.ru, berrior@rambler.ru, a.burkov@mail.ioffe.ru

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Comprehensive research aimed at studying the effect of structural changes caused by thermal treatment on the optical and electrophysical properties of GeTe in its rhombohedral structural modification have been performed using μ-Raman and μ-PL methods, together with measurements of the temperature dependences of electrical resistance and the Hall coefficient in a wide temperature range. Infrared PL in the range of 0.7-0.8 eV was detected for this compound for the first time. An analysis of the experimental dependences of the PL spectra on the concentration of charge carriers (holes) and temperature, using the results of calculations of the electronic structure in the electron density functional approximation, made it possible to establish its interband nature. Keywords: germanium telluride, Raman scattering, photoluminescence, electrical and thermal conductivity, thermopower.
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