Grain orientation and transport properties of textured Bi2Te3 alloys

Ojo, Oluwagbemiga P.; Thompson, Alan; Nolas, George S.

doi:10.1016/j.mssp.2021.105979

Cited by 9 publications

(5 citation statements)

References 44 publications

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“…Corresponding anisotropies in the thermal conductivity κ || /κ ⊥ are of about 2-2.5 for both n-type and p-type Bi 2 Te 3 . [54][55][56] Hence, correlations between the crystal orientation and TE properties are important in all forms of Bi 2 Te 3 -based materials.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on Bi₂Te₃‐based thin films: Thermoelectrics and beyond

Tang

Liu

et al. 2022

Interdisciplinary Materials

189

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Bi2Te3‐based materials are not only the most important and widely used room temperature thermoelectric (TE) materials but are also canonical examples of topological insulators in which the topological surface states are protected by the time‐reversal symmetry. High‐performance thin films based on Bi2Te3 have attracted worldwide attention during the past two decades due primarily to their outstanding TE performance as highly efficient TE coolers and as miniature and flexible TE power generators for a variety of electronic devices. Moreover, intriguing topological phenomena, such as the quantum anomalous Hall effect and topological superconductivity discovered in Bi2Te3‐based thin films and heterostructures, have shaped research directions in the field of condensed matter physics. In Bi2Te3‐based films and heterostructures, delicate control of the carrier transport, film composition, and microstructure are prerequisites for successful device operations as well as for experimental verification of exotic topological phenomena. This review summarizes the recent progress made in atomic defect engineering, carrier tuning, and band engineering down to a nanoscale regime and how it relates to the growth and fabrication of high‐quality Bi2Te3‐based films. The review also briefly discusses the physical insight into the exciting field of topological phenomena that were so dramatically realized in Bi2Te3‐ and Bi2Se3‐based structures. It is expected that Bi2Te3‐based thin films and heterostructures will play an ever more prominent role as flexible TE devices collecting and converting low‐level (body) heat into electricity for numerous electronic applications. It is also likely that such films will continue to be a remarkable platform for the realization of novel topological phenomena.

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Section: Introductionmentioning

confidence: 99%

A comprehensive review on Bi₂Te₃‐based thin films: Thermoelectrics and beyond

Tang

Liu

et al. 2022

Interdisciplinary Materials

189

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“…The single parabola band (SPB)-APS approximation is used to determine the L values from the S values. [40][41][42][45][46][47]. The κ c shows a similar trend of electrical conductivity, the decrease in carrier thermal conductivity with increasing temperature.…”

Section: Thermoelectric Transport Propertiesmentioning

confidence: 62%

Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Meena,

Bose,

Umarji

et al. 2023

Mater. Res. Express

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Sb2Te3-based materials are potential room-temperature thermoelectric materials. In the present work, we choose polycrystalline Sb2Te3/Te nanocomposites and utilize Poly Methyl Methacrylate (PMMA) to reduce the thermal conductivity of Sb2Te3 samples. PMMA and polycrystalline Sb2Te3/Te were mixed using ball milling for nanocomposites and pellets have been made by cold press method. The composition, microstructure, and thermoelectric transport properties of Sb2Te3/Te nanocomposites are found to be influenced by PMMA. With increasing PMMA concentration a p-type to n-type transition has been observed. Because there are fewer charge carriers or the composites have a higher resistance, the thermal conductivity decreases as the PMMA increases. This research paves the way for making the best thermoelectric materials by lowering thermal conductivity through the use of polymers.

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“…Several factors contribute to the diminished lattice thermal conductivity (κL) are the presence of heavy atoms, intricate chemical bonding, the periodic structure of QLs, and the fragility of the vdW bonds. Both n-type and p-type variants of Bi 2 Te 3 typically exhibit anisotropy ratios of σ||/σ⊥ ranging from 2 to 7, while the corresponding anisotropy ratios for thermal conductivity, κ||/κ⊥, are approximately in the range of 2-2.5 [34][35][36]. Consequently, in all Bi 2 Te 3 -based materials, establishing correlations between crystal orientation and thermoelectric characteristics holds paramount importance.…”

Section: Crystal Structurementioning

confidence: 99%

Recent Strategies for Improving Thermoelectric Efficiency of Bi2Te3-Based Thin Films

S. Chandra Bose,

K.A,

et al. 2023

New Materials and Devices for Thermoelectric Power Generation

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This chapter provides a concise summary of recent strategies for enhancing the thermoelectric (TE) efficiency of Bi2Te3-based thin films. In the introduction, a concise overview of thermoelectricity, its advantages over other technologies, its market value, and its potential future applications will be presented. Next, the preparation methods for Bi2Te3-based thin films will be described under the heading of thin film preparation methods. Then, contemporary strategies for enhancing the TE characterizations of Bi2Te3-based thin films will be discussed. Various strategies, such as the thin film fabrication methods and post-thermal annealing dependent TE properties of Bi2Te3-based thin films, have been discussed. The thin films prepared via vacuum techniques followed by thermal annealing showed high thermoelectric efficiency.

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Grain orientation and transport properties of textured Bi2Te3 alloys

Cited by 9 publications

References 44 publications

A comprehensive review on Bi₂Te₃‐based thin films: Thermoelectrics and beyond

A comprehensive review on Bi₂Te₃‐based thin films: Thermoelectrics and beyond

Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Recent Strategies for Improving Thermoelectric Efficiency of Bi2Te3-Based Thin Films

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Grain orientation and transport properties of textured Bi2Te3 alloys

Cited by 9 publications

References 44 publications

A comprehensive review on Bi2Te3‐based thin films: Thermoelectrics and beyond

A comprehensive review on Bi2Te3‐based thin films: Thermoelectrics and beyond

Polymer-mixed Sb2Te3/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

Recent Strategies for Improving Thermoelectric Efficiency of Bi2Te3-Based Thin Films

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A comprehensive review on Bi₂Te₃‐based thin films: Thermoelectrics and beyond

A comprehensive review on Bi₂Te₃‐based thin films: Thermoelectrics and beyond

Polymer-mixed Sb₂Te₃/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction