Numerical Analysis of Boundary Scattering Effect on Transport Properties in a Bi-Sb Nanowire
Numerical Analysis of Boundary Scattering Effect on Transport Properties in a Bi-Sb Nanowire
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Bi-Sb 纳米线中边界散射效应对输运特性的数值分析
DOI：
10.1007/s11664-013-2564-5
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发表时间：
2013
影响因子：
2.1
通讯作者：
Yasuhiro Hasegawa
中科院分区：
文献类型：
--
作者：
Yuta Nabatame;Tsuyoshi Matsumoto;Yuki Ichige;Takashi Komine;Ryuji Sugita;Masayuki Murata;Yasuhiro Hasegawa
在这项研究中，我们考虑了线边界散射，对 Bi-Sb 纳米线的传输特性进行了数值分析。线边界散射略微降低了 Bi-Sb 纳米线的塞贝克系数。这种效应是由于观察到纳米线中的边界散射和L点电子与T点空穴的迁移率比块状Bi-Sb中的小，因为线边界散射抑制了L点电子和重空穴的迁移率。当 Sb 浓度为 5 at.% 时，获得所有线径的最大塞贝克系数。有效质量在 5 at.% Sb 附近接近于零，并且较小的有效质量导致每个能带中存在较大的子带偏移。因此，即使考虑了线边界散射，小的有效质量也会增强固定线直径下的量子效应。
In this study, we have numerically analyzed the transport properties of Bi-Sb nanowires, taking into account wire boundary scattering. Wire boundary scattering slightly decreased the Seebeck coefficient of Bi-Sb nanowires. This effect is due to the observation that boundary scattering and the mobility ratio of L-point electrons to T-point holes in the nanowires are smaller than those in bulk Bi-Sb because the wire boundary scattering suppresses the mobilities of L-point electrons and heavy holes. The largest Seebeck coefficient for all wire diameters was obtained when the Sb concentration was 5 at.%. The effective mass approached zero near 5 at.% Sb, and the small effective mass led to a large subband shift in each band. Thus, a small effective mass enhances the quantum effect at a fixed wire diameter, even if wire boundary scattering is taken into account.