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Mechanisms of Two-Stage Conductivity Relaxation in CdTe:Cl with Ultrasound

  • Topical Collection: 19th International Conference on II-VI Compounds
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Abstract

We have investigated the kinetics of acoustic relaxation in low-ohmic n-CdTe:Cl crystals in the temperature range 77–200 K when ultrasound (longitudinal waves with a frequency ∼  10 MHz and an intensity  ∼ 104 W/m2) was switched on/off. We found that acoustic conductivity relaxation occurs in two stages. A fast (< 0.6 s) relaxation stage is mainly related to the charge carrier concentration changes and, in part, can be determined by acoustically induced changes of the scattering at dislocations and neutral impurities. A long (> 100 s) stage is mainly caused by the charge carriers mobility changes due to scattering at ionized impurities. We have also discussed possible acoustically stimulated restructuring of point-defective complexes in adjacent crystal regions.

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Authors and Affiliations

  1. V.E. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, pr. Nauky, Kyiv, 03028, Ukraine

    Ya. Olikh & M. Tymochko

  2. Physics Faculty, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine

    O. Olikh

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  1. Ya. Olikh
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  2. M. Tymochko
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  3. O. Olikh
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Correspondence to Ya. Olikh or M. Tymochko.

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Olikh, Y., Tymochko, M. & Olikh, O. Mechanisms of Two-Stage Conductivity Relaxation in CdTe:Cl with Ultrasound. J. Electron. Mater. 49, 4524–4530 (2020). https://doi.org/10.1007/s11664-020-08179-7

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