TRANSPORT-PROPERTIES ANALYSIS OF SINGLE-CRYSTALS (BIXSB1-X)2TE3 GROWN BY THE TRAVELING HEATER METHOD
TRANSPORT-PROPERTIES ANALYSIS OF SINGLE-CRYSTALS (BIXSB1-X)2TE3 GROWN BY THE TRAVELING HEATER METHOD
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DOI：
10.1016/0022-3697(93)90235-j
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发表时间：
1993-05-01
影响因子：
4
通讯作者：
SCHERRER, S
中科院分区：
文献类型：
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作者：
CAILLAT, T;GAILLIARD, L;SCHERRER, S
建立了p型（BixSb1-x）2 Te3单晶输运性质的模型。考虑单价带、声子和电离杂质散射，计算输运系数与实验输运系数相当吻合。在垂直于晶体三角形c轴方向（11）和平行于晶体三角形c轴方向（33）的输运系数的各向异性也在模型中得到了考虑。测定了x = 0.2和0.25两种固溶体的有效质量m（ij）、各向同性和各向异性能量无关弛豫时间因子tau（oac）和tau（oionii）在主要方向（ii = 11或33）上的分布。估计了两种固溶体的晶格导热系数。对于x = 0.225的固溶体，估计最大室温优值为3.2 x 10(-3) K-1，与实验结果吻合良好。
A modeling of the transport properties of p-type (BixSb1-x)2 Te3 single crystals is presented. Reasonably good agreement between calculated and experimental transport coefficients was achieved by considering a single valence band and acoustic phonon and ionized impurity scattering for holes. The anisotropy of the transport coefficients, in directions perpendicular (11) and parallel (33) to the trigonal c-axis of the crystals, was also taken into account in the model. The effective masses m(ij) the isotropic and anisotropic energy independent relaxation time factors tau(oac) and tau(oionii) for the main directions (ii = 11 or 33) were determined for two solid solutions with x = 0.2 and 0.25. The lattice thermal conductivities were estimated for the two solid solutions. The maximum room temperature figure of merit was estimated at 3.2 x 10(-3) K-1 for a solid solution with x = 0.225 in good agreement with the experimental results.