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Thermoelectric Transport by Surface States in Bi2Se3-Based Topological Insulator Thin Films
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作者 李龙龙 徐文 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第4期105-108,共4页
We develop a tractable theoretical model to investigate the thermoelectric (TE) transport properties of surface states in topological insulator thin films (TITFs) of Bi2Sea at room temperature. The hybridization b... We develop a tractable theoretical model to investigate the thermoelectric (TE) transport properties of surface states in topological insulator thin films (TITFs) of Bi2Sea at room temperature. The hybridization between top and bottom surface states in the TITF plays a significant role. With the increasing hybridization-induced surface gap, the electrical conductivity and electron thermal conductivity decrease while the Seebeck coefficient increases. This is due to the metal-semiconductor transition induced by the surface-state hybridization. Based on these TE transport coefficients, the TE figure-of-merit ZT is evaluated. It is shown that ZT can be greatly improved by the surface-state hybridization. Our theoretical results are pertinent to the exploration of the TE transport properties of surface states in TITFs and to the potential application of Bi2Sea-based TITFs as high-performance TE materials and devices. 展开更多
关键词 TE Thermoelectric Transport by Surface States in Bi2se3-Based Topological Insulator Thin Films Bi ZT seEBECK
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Physical vapor transport growth and morphology of Bi2Se3 microcrystals
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作者 V.V. Atuchin S.V. Borisov +3 位作者 T.A. Gavrilova K.A. Kokh N.V. Kuratieva N.V. Pervukhina 《Particuology》 SCIE EI CAS CSCD 2016年第3期118-122,共5页
High-quality Bi2Se3 microcrystals were grown by the physical vapor transport (PVT) method without using a foreign transport agent. The microplate crystals grown under the optimal temperature gradient are well facete... High-quality Bi2Se3 microcrystals were grown by the physical vapor transport (PVT) method without using a foreign transport agent. The microplate crystals grown under the optimal temperature gradient are well faceted and have dimensions up to -200 μm, The growth proceeds by the layer-by-layer mecha- nism with the formation of flat low-growth rate facets. The phase composition of the grown crystals was identified by the X-ray single crystal structure analysis in space group R3m, a = 4.1356(3), C= 28.634(5)A, Z=3 (R=0.0147). The most probable twin planes in the tetradymite structure were evaluated by the pseudo translational sublattice merhad. 展开更多
关键词 Bi2se3 Physical vapor transport Structure Twin
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