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A device for free-carrier recombination lifetime measurements

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Abstract

The design of a microwave system, the user interface, and the basic characteristics of noncontact equipment for measuring the recombination lifetime of free charge carriers in semiconductor materials by the photoconductivity-decay method are described. The features of the microwave-system design eliminate the need for a microwave circulator and other expensive elements of the systems without a loss in the equipment sensitivity. This substantially simplifies the design and provides automated measurements of the free-carrier lifetime in silicon single crystals in a range of 0.2 μs to tens of milliseconds. The upper measurement limit is determined by the geometrical dimensions of a sample and the surface treatment quality. The results of measuring the photoconductivity relaxation time in reference single-crystal silicon samples are presented.

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Correspondence to S. P. Kobeleva.

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Original Russian Text © S.P. Kobeleva, I.M. Anfimov, I.V. Schemerov, 2016, published in Pribory i Tekhnika Eksperimenta, 2016, No. 3, pp. 91–95.

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Kobeleva, S.P., Anfimov, I.M. & Schemerov, I.V. A device for free-carrier recombination lifetime measurements. Instrum Exp Tech 59, 420–424 (2016). https://doi.org/10.1134/S0020441216030064

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  • DOI: https://doi.org/10.1134/S0020441216030064

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