Strong Phonon Charge Carrier Coupling In Thermoelectric Clathrates

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Electroactive Materials for Energy harvesting

THERMOELECTRIC MATERIALS IESRES teaching activity - Klaipeda, Lithuania - 8-13 May 2017 Electric conductivity Thermal conductivity Phonon glass and electron crystal H.B. Radousky, H. Liang, LLNL JRNL,526171, 2012

Thermal conductivity resonances of acceptor 8 states in cubic

Dec 07, 2019 Piezo phonon spectroscopy of the ground states of acceptors in Si and Ge M Schwarte and P Berberich-Phonon spectroscopy M N Wybourne and J K Wigmore-Recent citations Strong phonon charge carrier coupling in thermoelectric clathrates Simon Johnsen et al-An unusually strong resonant phonon scattering by 3-d impurities in II-VI semiconductors V.I

20/2018

with interatomic bonds is responsible for strong phonon-phonon interactions, thus it is an important factor for low k in many classes of materials. Specifically, the rattling of guest atoms in cage-like structures or systems with loosely bound atoms is a source of enhanced phonon scattering.[19 25] Also,

Controlling superstructural ordering in the clathrate-I

of high ZT materials is the strong coupling of S, r, and k.1 The phonon-glass electron-crystal (PGEC) idea suggests the decoupling of heat and charge transport using ordered frame-works and guest atoms with large displacement parameters: rattlers Inorganic clathrates are PGEC materials. Their

3 arXiv:1902.03424v2 [cond-mat.mtrl-sci] 7 Sep 2019

performance, and provides promising candidates of high-performance thermoelectric materials. I. INTRODUCTION Searching high-performance thermoelectric materials is a central issue in the study of themoelectrics. There are many promising compounds such as Bi 2Te 3 1 3, lead chalcogenides4 7, skutterudites8 12, clathrates13, and NaxCoO 2 14

Enhanced Thermoelectric Properties in a New Silicon Crystal

for potential thermoelectric materials. However, it is still challenging to achieve a high ZT in three-dimensional (3D) crystals because the materials properties listed above are coupled to each other. For instance, increasing a charge carrier in 3D semiconductor by doping would increase both σ and κ e simultaneously. Also, lifetimes of both

A computational assessment of the electronic, thermoelectric

affected by the charge carrier concentration. 3 Hence, to optimize zT, the carrier concentration must be tuned and k L should be lowered. Reduction of k L can be engineered by introducing various phonon scattering sources such as nanoparticles, grain boundaries, and point defects.4 Furthermore, some materials such as clathrates, 5

Sirusi Review Thermoelectric withfigures

inorganic clathrates, skutterudites, oxides, and half-Huesler compounds, as well as superionic conductors and complex telluride materials. A large list of thermoelectric materials can be found in Ref. [18] as well as in the general reviews cited above. 1.2' NMR'Concepts'and'Applications'in'Thermoelectric'Systems'

Theoretical Considerations for Finding New Thermoelectric

Much effort in thermoelectric research goes into finding materials with low thermal conductivities, , and for good reason, since is in the denominator of ZT. In fact, the need for low can be quantified. Thermoelectric devices operate by exploiting the cross-terms in the equations for charge and heat transport in materials. High

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thermoelectric oxides, where there is strong coupling of κ to the electronic power factor, the electronic transport of these materials can be optimised independently of the thermal transport through cation substitution at the octahedral B site. The low κ of the phonon-glass parent is retained across the La 0.5 Na 0.5 Ti 1 x Nb x O 3

JAIST Repository: JAIST学術研究成果リポジトリ

the type of carrier conduction from n-type to p-type or vice versa, in addition to produce the change of carrier mobility as well as to reduceκL. Even for these established thermoelectric materials, new theoretical approach, i.e. carrier pocket engineering3) to lead an optimum value of ZT has been

Crystalline Solids with Intrinsically Low Lattice Thermal

May 04, 2018 ABSTRACT: The extrinsic routes to manipulating phonon transport, for instance, through multiple defects of hierarchical length scales, are proven effective in suppressing the lattice thermal conductivity (κ L), but their use-fulness primarily relies on the selective scattering of phonons over charge carriers.

1,2, 3 á 5 nez 1 az - MDPI

Feb 09, 2020 This e ect creates oxygen vacancies, which also generates charge carriers [27 29]. As a result, power factors of ca. 3.5 mW m 1 K 2 have been reported for STO-based materials [30]. Additionally, a strong phonon-electron coupling can take place and induce the formation of polarons. Consequently,