Electronic properties and energy spectrum of SnTe doped with In

Elena I. Rogacheva; S. A. Laptev

doi:10.1117/12.368383

4 November 1999 Electronic properties and energy spectrum of SnTe doped with In

Elena I. Rogacheva, S. A. Laptev

Proceedings Volume 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics; (1999) https://doi.org/10.1117/12.368383
Event: Material Science and Material Properties for Infrared Optoelectronics, 1998, Kiev, Ukraine

Abstract

The temperature and concentration dependences of electrical conductivity (sigma) , Hall coefficient R_H and coefficient of thermo-e.m.f. S for the samples of the SnTe solid solutions are obtained. On the basis of experimental data the model of energy spectrum of SnTe doped with In taking into account the high concentration of nonstoichiometric vacancies in SnTe and variable valency of the In atoms is proposed. According to the model the valence band contains tow resonance bands corresponding to the In atoms localized in octa- and tetrahedral positions. The vacancy band is the lowest on the energy scale of the valence band, followed by impurity bands. The gaps and their temperature dependencies, carried mobilities in the different impurity bands are obtained. The doping mechanism of In introduced in different proportions with vacancies is determined by impurity band state occupation in consecutive order according to their location on the energy scale and by the Fermi level position. The Fermi level is located in one of the impurity bands depending on proportion of In¹⁺ and In³⁺ atoms and vacancies.

Citation Download Citation

Elena I. Rogacheva and S. A. Laptev "Electronic properties and energy spectrum of SnTe doped with In", Proc. SPIE 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics, (4 November 1999); https://doi.org/10.1117/12.368383

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