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XVII Interstate Conference ''Thermoelectrics and Their Applications -- 2021" (ISCTA 2021 St. Petersburg, September 13-16, 2021)
Differential tunneling conductance in multicomponent solid solutions Bi$_{2-x}$Sb$_{x}$Te$_{3-y-z}$Se$_{y}$S$_{z}$
L. N. Luk'yanova, I. V. Makarenko, O. A. Usov Ioffe Institute, St. Petersburg
Abstract:
Differential tunnel conductance of the interlayer van der Waals surface (0001) was investigated in $n$-Bi$_{2-x}$Sb$_{x}$Te$_{3-y-z}$Se$_{y}$S$_{z}$ multicomponent solid solutions at $x$ = 0.2, $y=z$ = 0.09, optimized for near room temperatures with a high power factor, and at $x$ = 0.4, $y$ = 0, $z$ = 0.06 with optimal thermoelectric properties for low temperatures and a high Seebek coefficient. It is shown that the intensity of the fluctuations of the Dirac point energy $\Delta E_{\mathrm{D}}$, a shift the top of the valence band and presence of surface levels in the energy gap formed by impurity defects is determined with composition and thermoelectric properties of solid solutions. The contribution of the surface states of Dirac fermions increases in $n$-Bi$_{1.8}$Sb$_{0.2}$Te$_{2.82}$Se$_{0.09}$S$_{0.09}$ solid solution with a high power factor due to significant decrease of the surface concentration near the charge neutrality point and the growth of fermion mobility.
Keywords:
bismuth telluride, solid solutions, topological insulator, differential tunneling conductance, Seebeck coefficient.
Received: 12.08.2021 Revised: 28.08.2021 Accepted: 28.08.2021
Citation:
L. N. Luk'yanova, I. V. Makarenko, O. A. Usov, “Differential tunneling conductance in multicomponent solid solutions Bi$_{2-x}$Sb$_{x}$Te$_{3-y-z}$Se$_{y}$S$_{z}$”, Fizika i Tekhnika Poluprovodnikov, 55:12 (2021), 1128–1131
Linking options:
https://www.mathnet.ru/eng/phts4905 https://www.mathnet.ru/eng/phts/v55/i12/p1128
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Abstract page: | 95 | Full-text PDF : | 27 |
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