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The Thermoelectric Properties of n-Type Bismuth Telluride:Bismuth Selenide Alloys Bi_(2)Te_(3−x)Se_(x)

Research 2020年第1期2020卷 724-738页

作者： Ian T.Witting Francesco Ricci thomas C.chasapis Geoffroy Hautier G.Jeffrey Snyder Department of Materials Science and Engineering Northwestern University2220 Campus DriveCook Hall 2036EvanstonIL 60208USA Institute of Condensed Matter and Nanosciences UniversitéCatholique de LouvainLouvain-la-Neuve 1348Belgium

Alloying bismuth telluride with antimony telluride and bismuth selenide for p-and n-type materials,respectively,improves the thermoelectric quality factor for use in room temperature *** the electronic and thermal transports can vary substantially,the alloy composition is a key engineering *** n-type Bi_(2)Te_(3-x)Se_(x)alloy lags its p-type counterpart in thermoelectric performance and does not lend itself as readily to simple transport modeling which complicates *** literature data with recent results across the entire alloy composition range,the complex electronic structure dynamics and trends in lattice thermal conductivity are ***-orbit interaction plays a critical role in determining the position and degeneracy of the various conduction band *** behavior is incorporated into a two-band effective mass model to estimate the transport parameters in each *** alloy scattering model is utilized to demonstrate how phonon scattering behaves differently on either side of the intermediate ordered compound Bi2Te2Se due to chalcogen site occupancy *** parametrization of the electronic and thermal transports presented can be used in future optimization efforts.

关键词： alloy bismuth transport

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Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites

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Nano Research 2020年第5期13卷 1339-1346页

作者： Enzheng Shi Shuang Cui Nicholas Kempf Qingfeng Xing thomas chasapis Huazhang Zhu Zhe Li Je-Hyeong Bahk G.Jeffrey Snyder Yanliang Zhang Renkun Chen Yue Wu Department of Chemical and Biological Engineering Iowa State UniversityAmesIA 50011USA Ames Laboratory Department of EnergyIowa State UniversityAmesIA 50011USA Department of Mechanical and Aerospace Engineering University of California-San DiegoLa JollaCA 92093USA Buildings and Thermal Sciences Center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Aerospace and Mechanical Engineering University of Notre DameNotre DameIN 46556USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Mechanical and Materials Engineering University of CincinnatiCincinnatiOH 45221USA

Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric ***,the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so ***,we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride(BiSbTe)thermoelectric nanocomposites fabricated from solution-synthesized *** figure of merit can reach 1.18,which,however,can be overestimated to 1.88 without considering the *** study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity,textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy *** finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.

关键词： bismuth antimony telluride solution synthesis thermoelectrics inhomogeneity

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