Modeling of structural and energetic parameters of  р-Er1-xScxNiSb semiconductor

Yu. Stadnyk; V.A. Romaka; A. Horyn; V.V. Romaka; L. Romaka; P. Klyzub; V. Pashkevych; P. Gorpenyuk

doi:10.15330/pcss.22.3.509-515

Authors

Yu. Stadnyk Ivan Franko National University of Lviv
V.A. Romaka Lviv Polytechnic National University
A. Horyn Ivan Franko National University of Lviv
V.V. Romaka Technische Universität Dresden
L. Romaka Ivan Franko National University of Lviv
P. Klyzub Ivan Franko National University of Lviv
V. Pashkevych Lviv Polytechnic National University
P. Gorpenyuk Lviv Polytechnic National University

DOI:

https://doi.org/10.15330/pcss.22.3.509-515

Keywords:

semiconductor, electrical conductivity, thermopower coefficient, Fermi lervel

Abstract

The energy expediency of the existence of Er_1-xSc_xNiSb substitutional solid solution up to the concentration x≈0.10 was established by modeling the variation of free energy ΔG(x) values (Helmholtz potential). At higher Sc concentrations, x> 0.10, there is stratification (spinoidal decomposition of phase). It is shown that in the structure of p-ErNiSb semiconductor there are vacancies in positions 4a and 4c of Er and Ni atoms, respectively, generating structural defects of acceptor nature. The number of vacancies in position 4a is twice less than in position 4c. This ratio also remains for p-Er_1-xSc_xNiSb. Doping of p-ErNiSb semiconductor by Sc atoms by substitution of Er atoms is also accompanied by the occupation of vacancies in position 4a. In this case, Ni atoms occupy vacancies in position 4c, which can be accompanied by the process of ordering the p-Er_1-xSc_xNiSb structure. Occupation of vacancies by Sc and Ni atoms leads to an increase of the concentration of free electrons, an enlarge of the compensation degree of semiconductor, which changes the position of the Fermi level ε_F and the mechanisms of electrical conductivity.

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