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SM ISO690:2012 LAIHO, Reino, LASHKUL, Alexander V., LISUNOV, Konstantin, LÄHDERANTA, Erkki, SAFONTCHIK, M., SHAKHOV, Mikhail. The Hall effect and electron energy spectrum near the conduction band edge of n-CdSb in magnetic fields up to 25 T. In: Semiconductor Science and Technology, 2006, vol. 21, pp. 918-927. ISSN 0268-1242. DOI: https://doi.org/10.1088/0268-1242/21/7/016 |
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Semiconductor Science and Technology | |
Volumul 21 / 2006 / ISSN 0268-1242 | |
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DOI:https://doi.org/10.1088/0268-1242/21/7/016 | |
Pag. 918-927 | |
Rezumat | |
The Hall effect in the II-V group semiconductor n-CdSb doped with In is investigated in pulsed magnetic fields up to B ≤ 25 T and temperatures between T ≤ 2 and 77 K for samples oriented along the [0 1 0] and [0 0 1] crystallographic axes. The Hall coefficient, R (B, T), exhibits a sequence of an almost flat region followed by a descending interval and an upturn when B is increased. The decrease of R (B, T) is interpreted by the presence of two groups of electrons with concentrations n2(T) > n1(T) and mobilities μ2(T) < μ1(T). Analysis of n 1(T) and n2(T) demonstrates that the high-mobility carriers n1 are the conduction band (CB) electrons, whereas the low-mobility carriers n2 are itinerant electrons of a lower resonant impurity band (IB), having at low T energies of Ei ∼ 3-4 meV above the CB edge. In addition, near the CB edge lies a higher IB containing only localized electron states. The IBs are split by spin to states differing by an energy ΔEi ≈ 0.9 meV. The upturn of R (B, T) in the high-field region is explained by the redistribution of the electrons between the IBs due to the decrease of ΔEi when B is increased. The mobility of the CB electrons is determined presumably by strong anisotropic scattering on neutral impurity centres, accompanied at high T by isotropic scattering on acoustic phonons, whereas scattering from ionized impurities is small. |
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Cuvinte-cheie Acoustic wave scattering, Doping (additives), Hall effect, Magnetic fields, phonons, resonance, Semiconducting cadmium compounds |
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