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Plasma screening of the fundamental absorption edge in crystals of Bi2Te3-Sb2Te3 solid solutions with more than 80 mol % Sb2Te3

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Abstract

The regularities of changes in the optical properties of crystals of Bi2Te3-Sb2Te3 solid solutions in the range of the effects caused by free-carrier plasma oscillations at a variation in the ratio of Bi2Te3 and Sb2Te3 components are investigated. It is established that, when the Sb2Te3 content in a solid solution exceeds 80 mol %, the fundamental absorption edge undergoes plasma screening. Doping a Sb2Te3 crystal with tin increases the free-carrier concentration and plasma frequencies, thus enhancing the screening effect, whereas introduction of 0.1 mol % selenium reduced the plasma frequency and thus removes the fundamental-absorption-edge screening.

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Authors and Affiliations

  1. Transbaikal State University, Chita, 672039, Russia

    N. P. Stepanov

  2. Transbaikal Institute of Railroad Transport, Chita, 672040, Russia

    A. A. Kalashnikov

  3. Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia

    Yu. V. Ulashkevich

Authors
  1. N. P. Stepanov
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  2. A. A. Kalashnikov
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  3. Yu. V. Ulashkevich
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Corresponding author

Correspondence to N. P. Stepanov.

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Original Russian Text © N.P. Stepanov, A.A. Kalashnikov, Yu.V. Ulashkevich, 2014, published in Optika i Spektroskopiya, 2014, Vol. 117, No. 3, pp. 415–419.

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Stepanov, N.P., Kalashnikov, A.A. & Ulashkevich, Y.V. Plasma screening of the fundamental absorption edge in crystals of Bi2Te3-Sb2Te3 solid solutions with more than 80 mol % Sb2Te3 . Opt. Spectrosc. 117, 401–405 (2014). https://doi.org/10.1134/S0030400X14090240

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  • DOI: https://doi.org/10.1134/S0030400X14090240

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