Bibliographies thématiques / Thermoelectrics, nanostructuring, energy filtering

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Littérature scientifique sur le sujet « Thermoelectrics, nanostructuring, energy filtering »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Thermoelectrics, nanostructuring, energy filtering"

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Sonnathi, Neeleshwar, Anjali Panwar, Vikas Malik et Anjana Bagga. « Theoretical Investigations Of Interfacial Scattering Effects On Thermoelectric Properties Of Bulk Nanostructured PbTe System ». MRS Advances 3, no 24 (2018) : 1329–34. http://dx.doi.org/10.1557/adv.2018.48.

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ABSTRACTEnhancement of thermoelectric properties at room temperature has been recently demonstrated by spark plasma sintered PbTe nanocubes as compared to other PbTe nanostructures as well as Bulk material. The Seebeck coefficient has been reported to be 400 µV/K which is much higher than the bulk. Moreover, a moderate electrical conductivity ∼ 8000 S/m at room temperature results in considerable higher value of power factor S2σ ∼ 1.28 x 10-3 Wm-1K-2. The enhanced thermoelectric properties have been conjectured to be present due to energy filtering effects at numerous interfaces introduced by nanostructuring. We study how the interfacial scattering affects the power factor by performing theoretical modelling based on Boltzmann Transport Equation (BTE). We also investigate in detail, the role of various electronic parameters such as size, shape, mobility and effective mass etc., on interfacial scattering to optimize its effect on power factor.
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Narducci, Dario. « Energy Filtering and Thermoelectrics : Artifact or Artifice ? » Journal of Nanoscience and Nanotechnology 17, no 3 (1 mars 2017) : 1663–67. http://dx.doi.org/10.1166/jnn.2017.13726.

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Spooner, Kieran B., Alex M. Ganose et David O. Scanlon. « Assessing the limitations of transparent conducting oxides as thermoelectrics ». Journal of Materials Chemistry A 8, no 24 (2020) : 11948–57. http://dx.doi.org/10.1039/d0ta02247k.

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Many TCOs are limited as thermoelectrics by their long phonon mean free paths. We demonstrate the importance of computational analysis of lattice thermal conductivity for pinpointing which materials are effective targets for nanostructuring.
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Kajitani, Tsuyoshi, Yuzuru Miyazaki, Kei Hayashi, Kunio Yubuta, X. Y. Huang et W. Koshibae. « Thermoelectric Energy Conversion and Ceramic Thermoelectrics ». Materials Science Forum 671 (janvier 2011) : 1–20. http://dx.doi.org/10.4028/www.scientific.net/msf.671.1.

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Oxide thermoelectrics are relatively new materials that are workable at temperatures in the range of 400K≤T≤1200K. There are several types of thermoelectric oxide, namely, cobalt oxides (p-type semi-conductors), manganese oxides (n-type) and zinc oxides (n-type semi-conductors) for high temperature energy harvesting. The Seebeck coefficient of 3d metal oxide thermoelectrics is relatively high due to either high density of states at Fermi surfaces or spin entropy flow associated with the carrier flow. The spin entropy part dominates the Seebeck coefficient of 3d-metal oxides at temperatures above 300K. Introduction of impurity particles or quantum-well structures to enhance thermionic emission and energy filtering effects for the oxide semiconductors may lead to a significant improvement of thermoelectric performance.
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Liang, Zhiming, Mathias J. Boland, Kamal Butrouna, Douglas R. Strachan et Kenneth R. Graham. « Increased power factors of organic–inorganic nanocomposite thermoelectric materials and the role of energy filtering ». Journal of Materials Chemistry A 5, no 30 (2017) : 15891–900. http://dx.doi.org/10.1039/c7ta02307c.

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Kostopoulou, Athanasia, Konstantinos Brintakis, Nektarios K. Nasikas et Emmanuel Stratakis. « Perovskite nanocrystals for energy conversion and storage ». Nanophotonics 8, no 10 (19 juillet 2019) : 1607–40. http://dx.doi.org/10.1515/nanoph-2019-0119.

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AbstractThe high demand for energy consumption in everyday life, and fears of climate change are driving the scientific community to explore prospective materials for efficient energy conversion and storage. Perovskites, a prominent category of materials, including metal halides and perovskite oxides have a significant role as energy materials, and can effectively replace conventional materials. The simultaneous need for new energy materials together with the increased interest for making new devices, and exploring new physics, thrust the research to control the structuring of the perovskite materials at the nanoscale. Nanostructuring of the perovskites offers unique features such as a large surface area, extensive porous structures, controlled transport and charge-carrier mobility, strong absorption and photoluminescence, and confinement effects. These features together with the unique tunability in their composition, shape, and functionalities make perovskite nanocrystals efficient for energy-related applications such as photovoltaics, catalysts, thermoelectrics, batteries, supercapacitor and hydrogen storage systems. The synthesis procedures of perovskite nanostructures in different morphologies is summarized and the energy-related properties and applications are extensively discussed in this paper.
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Zhou, Jiawei, Bolin Liao, Bo Qiu, Samuel Huberman, Keivan Esfarjani, Mildred S. Dresselhaus et Gang Chen. « Ab initio optimization of phonon drag effect for lower-temperature thermoelectric energy conversion ». Proceedings of the National Academy of Sciences 112, no 48 (16 novembre 2015) : 14777–82. http://dx.doi.org/10.1073/pnas.1512328112.

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Although the thermoelectric figure of merit zT above 300 K has seen significant improvement recently, the progress at lower temperatures has been slow, mainly limited by the relatively low Seebeck coefficient and high thermal conductivity. Here we report, for the first time to our knowledge, success in first-principles computation of the phonon drag effect—a coupling phenomenon between electrons and nonequilibrium phonons—in heavily doped region and its optimization to enhance the Seebeck coefficient while reducing the phonon thermal conductivity by nanostructuring. Our simulation quantitatively identifies the major phonons contributing to the phonon drag, which are spectrally distinct from those carrying heat, and further reveals that although the phonon drag is reduced in heavily doped samples, a significant contribution to Seebeck coefficient still exists. An ideal phonon filter is proposed to enhance zT of silicon at room temperature by a factor of 20 to ∼0.25, and the enhancement can reach 70 times at 100 K. This work opens up a new venue toward better thermoelectrics by harnessing nonequilibrium phonons.
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Singha, Aniket, et Bhaskaran Muralidharan. « Incoherent scattering can favorably influence energy filtering in nanostructured thermoelectrics ». Scientific Reports 7, no 1 (11 août 2017). http://dx.doi.org/10.1038/s41598-017-07935-w.

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Carroll, David L., et Hewitt Corey. « Modulation doping and energy filtering in two-dimensional, dichalcogenides : Moving toward flexible thermoelectrics with a ZT 1 ». Journal of Nanomaterials & ; Molecular Nanotechnology 07 (2018). http://dx.doi.org/10.4172/2324-8777-c4-029.

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Thèses sur le sujet "Thermoelectrics, nanostructuring, energy filtering"

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SELEZNEVA, EKATERINA. « Physical and Chemical Aspects of Thermoelectric Phenomena in Nanostructured Materials ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28405.

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Thermoelectric efficiency of a material is described by the so-called thermoelectric figure of merit ZT = S2σκ-1T, where S is the Seebeck coefficient, σ and κ are correspondingly the electrical and the total thermal conductivities. Nanostructuring has opened new ways to improve thermoelectric performance of a material either by decreasing κ or by increasing S2σ. We have studied thermoelectric properties of two nanostructured systems: heavily-doped polycrystalline silicon films with embedded nanocavities and InGaAs films with high concentration rare-earth TbAs embedded nanoparticles. In the first system, we have analysed the effect of the formation of nanocavities, which were expected to act as efficient phonon scattering centres, thus reducing the thermal conductivity. The thermal conductivity was about half of the reported value in bulk polycrystalline silicon, however, the same low value was measured in the samples without nanocavities. This might suggest that the film microstructure dominates the thermal conductivity in all cases. The material also showed outstanding thermoelectric properties. Upon thermal treatments at temperatures above 800°C we measured higher Seebeck coefficients than those normally found in monocrystalline silicon at corresponding doping level. This increase was found to be connected to the electron energy filtering by the potential barriers at the grain boundaries which accumulated dopant precipitates during the thermal treatments. As the result we have obtained a maximum ZT of 0.18 at room temperature. In the second system, we studied the effect of embedded TbAs nanoparticles on the thermoelectric properties of InGaAs. In this group of materials, the nanoparticles serve to reduce thermal conductivity (through phonon scattering), increase Seebeck coefficient (through electron energy filtering), and increase of electrical conductivity (through nanoparticle donation of electrons). Both presence of the electron filtering and decrease of the thermal conductivity was experimentally observed. The electrical conductivity, however, drastically decreased and no enhancement of ZT was achieved.
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Dusetty, Venkatakrishna. « Numerical Simulation of Thermoelectric Transport in Bulk and Nanostructured SiSn Alloys ». 2020. https://scholarworks.umass.edu/masters_theses_2/935.

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The current high demand for sustainable and renewable energy sources to solve world energy crisis has enormously increased interest in looking at alternative sources of energy. All the machines used in manufacturing process, electricity generation, residential applications, transportation etc., rejects energy in the form of heat into environment. Thermoelectric materials can convert thermal-to-electrical and electrical-to-thermal energy and can be utilized in waste-heat harvesting, more efficient cooling to reduce energy usage and CO2 emissions. Significant research efforts have been devoted over the past decade to thermoelectric materials, with particular emphasis being placed on combining materials selection with nanostructuring. The overarching goal was to reduce thermal conductivity through selective phonon scattering and thus boost the thermoelectric figure-of-merit (ZT). SiGe alloys, as well as superlattices and nanocomposites made from them, showed significant improvements upon nanostructuring and ZT exceeding one at high temperatures. Other group IV alloys were not studied in the context of thermoelectrics. However, SiSn alloys are widely studied for their optoelectronic properties because they were predicted to become direct-gap materials when Sn composition increased beyond about 50%. To address this gap, we study the thermoelectric properties of SiSn alloys. Furthermore, we develop an iterative full-band solver for the electron Boltzmann transport equation and use it to compute the electron and hole mobility and Seebeck coeffcient in SiSn alloys. The electronic structure of SiSn alloys was computed in the virtual crystal approximation from non-local empirical pseudopotentials, while the application of strain allowed us to extract the electron-phonon coupling deformation potentials for each alloy composition. We benchmark our code against available mobility data for Si and SiGe alloys and find that it accurately reproduces the measured values. Full phonon dispersion was computed from the adiabatic bond charge model, which was shown to accurately reproduce measured dispersion, and used in our phonon BTE solver to compute lattice thermal conductivities. Scattering rates include anharmonic phonon-phonon, impurity, isotope, alloy, and boundary mechanisms. The lowest thermal conductivity was obtained in SiSn alloys, which have been experimentally demonstrated with up to 18% Sn composition. This carries through when combined with calculations of electronic power factor, where mobilities and Seebeck coeffcients of SiSn alloys are comparable to those of SiGe. Furthermore, ZT is optimized through doping for every composition. The ZT improves dramatically at higher temperatures, reaching ZT of 1.9, 2.36 is obtained for Sn composition of 10% and 50% in a n-doped bulk SiSn alloys at a temperature of 1480 K. However, such high Sn composition of 50% is unlikely to be synthesized due to low solid solubility of Sn in Si. Lastly, we study the impact of nanostructuring in thin films on the ZT. We also establish the limits on how much the ZT can be improved through nanostructuring by studying thin films of SiSn alloys across temperature from room temperature up to 1500 K. We conclude that in bulk SiSn alloys, even at modest Sn concentration of 10%, ZT can reach 1.9, while in 20 nm thin films of n-type SiSn alloys, it can reach the long-sought target of ZT>3 and ZT of 2.16 is obtained in p-type nanostructured SiSn alloys.
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Kommini, Adithya. « The Impact of Quantum Size Effects on Thermoelectric Performance in Semiconductor Nanostructures ». 2017. https://scholarworks.umass.edu/masters_theses_2/470.

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An increasing need for effective thermal sensors, together with dwindling energy resources, have created renewed interests in thermoelectric (TE), or solid-state, energy conversion and refrigeration using semiconductor-based nanostructures. Effective control of electron and phonon transport due to confinement, interface, and quantum effects has made nanostructures a good way to achieve more efficient thermoelectric energy conversion. This thesis studies the two well-known approaches: confinement and energy filtering, and implements improvements to achieve higher thermoelectric performance. The effect of confinement is evaluated using a 2D material with a gate and utilizing the features in the density of states. In addition to that, a novel controlled scattering approach is taken to enhance the device thermoelectric properties. The shift in the onset of scattering due to controlled scattering with respect to sharp features in the density of states creates a window shape for transport integral. Along with the controlled scattering, an effective utilization of Fermi window can provide a considerable enhancement in thermoelectric performance. The conclusion from the results helps in selection of materials to achieve such enhanced thermoelectric performance. In addition to that, the electron filtering approach is studied using the Wigner approach for treating the carrier-potential interactions, coupled with Boltzmann transport equation which is solved using Rode's iterative method, especially in periodic potential structures. This study shows the effect of rapid potential variations in materials as seen in superlattices and the parameters that have significant contribution towards the thermoelectric performance. Parameters such as period length, height and smoothness of such periodic potentials are studied and their effect on thermoelectric performance is discussed. A combination of the above two methods can help in understanding the effect of confinement and key requirements in designing a nanostructured thermoelectric device that has a enhanced performance.
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Chapitres de livres sur le sujet "Thermoelectrics, nanostructuring, energy filtering"

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Thesberg, Mischa, Mahdi Pourfath, Neophytos Neophytou et Hans Kosina. « A Non-Equilibrium Green Functions Study of Energy-Filtering Thermoelectrics Including Scattering ». Dans Large-Scale Scientific Computing, 301–8. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26520-9_33.

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Flage-Larsen, Espen, et Ole Martin Løvvik. « Band Structure Guidelines for Higher Figure-of-Merit : Analytic Band Generation and Energy Filtering ». Dans Materials, Preparation, and Characterization in Thermoelectrics, 185–206. CRC Press, 2017. http://dx.doi.org/10.1201/b11891-10.

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« - Band Structure Guidelines for Higher Figure-of-Merit : Analytic Band Generation and Energy Filtering ». Dans Thermoelectrics and its Energy Harvesting, 2-Volume Set, 207–28. CRC Press, 2018. http://dx.doi.org/10.1201/b11869-14.

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Actes de conférences sur le sujet "Thermoelectrics, nanostructuring, energy filtering"

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Narducci, Dario, Ekaterina Selezneva, Gianfranco Cerofolini, Stefano Frabboni et Giampiero Ottaviani. « High figures of merit in degenerate semiconductors. Energy filtering by grain boundaries in heavily doped polycrystalline silicon ». Dans 9TH EUROPEAN CONFERENCE ON THERMOELECTRICS : ECT2011. AIP, 2012. http://dx.doi.org/10.1063/1.4731559.

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Ohtaki, Michitaka, et Ryosuke Hayashi. « Enhanced Thermoelectric Performance of Nanostructured ZnO : A possibility of selective phonon scattering and carrier energy filtering by nanovoid structure ». Dans 2006 25th International Conference on Thermoelectrics. IEEE, 2006. http://dx.doi.org/10.1109/ict.2006.331368.

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