Large Seebeck effect by charge-mobility engineering

Published on Jun 25, 2015in Nature Communications14.919
· DOI :10.1038/NCOMMS8475
Peijie Sun18
Estimated H-index: 18
(CAS: Chinese Academy of Sciences),
Beipei Wei3
Estimated H-index: 3
(CAS: Chinese Academy of Sciences)
+ 5 AuthorsFrank Steglich88
Estimated H-index: 88
(MPG: Max Planck Society)
The Seebeck effect describes the generation of an electric potential in a conducting solid exposed to a temperature gradient. In most cases, it is dominated by an energy-dependent electronic density of states at the Fermi level, in line with the prevalent efforts towards superior thermoelectrics through the engineering of electronic structure. Here we demonstrate an alternative source for the Seebeck effect based on charge-carrier relaxation: a charge mobility that changes rapidly with temperature can result in a sizeable addition to the Seebeck coefficient. This new Seebeck source is demonstrated explicitly for Ni-doped CoSb3, where a marked mobility change occurs due to the crossover between two different charge-relaxation regimes. Our findings unveil the origin of pronounced features in the Seebeck coefficient of many other elusive materials characterized by a significant mobility mismatch. When utilized appropriately, this effect can also provide a novel route to the design of improved thermoelectric materials.
Figures & Tables
📖 Papers frequently viewed together
#1Huili Liu (CAS: Chinese Academy of Sciences)H-Index: 19
#2Xun Yuan (CAS: Chinese Academy of Sciences)H-Index: 18
Last. Ctirad Uher (UM: University of Michigan)H-Index: 103
view all 17 authors...
: Iodine-doped Cu2 Se shows a significantly improved thermoelectric performance during phase transitions by electron and phonon critical scattering, leading to a dramatic increase in zT by a factor of 3-7 times culminating in zT values of 2.3 at 400 K.
#1Peijie Sun (MPG: Max Planck Society)H-Index: 18
#2Frank Steglich (MPG: Max Planck Society)H-Index: 88
A distinctly temperature-dependent Nernst coefficient, � , which is strongly enhanced over that of LaCu2Si2, is observed between T ¼ 2 and 300 K for CeCu2Si2 and Ce0:8La0:2Cu2Si2. The enhanced � ðTÞ is determined by the asymmetry of the on-site Kondo (conduction electron � 4f electron) scattering rate. Taking into account the measured Hall mobility, � H, the highly unusual thermopower, S, of these systems can be semiquantitatively described by SðT Þ¼� � ðTÞ=� HðTÞ, which explicitly demonstrates ...
#2Xinming Qin (USTC: University of Science and Technology of China)H-Index: 2
The subject of the involved phase transition in solid materials has formed not only the basis of materials technology but also the central issue of solid-state chemistry for centuries. The ability to design and control the required changes in physical properties within phase transition becomes key prerequisite for the modern functionalized materials. Herein, we have experimentally achieved the high thermoelectric performance (ZT value reaches 1.5 at 700 K) and reversible p-n-p semiconducting swi...
#1Joseph R. Sootsman (NU: Northwestern University)H-Index: 10
#2Duck Young Chung (Argonne National Laboratory)H-Index: 43
Last. Mercouri G. Kanatzidis (NU: Northwestern University)H-Index: 169
view all 3 authors...
Herein we cover the key concepts in the field of thermoelectric materials research, present the current understanding, and show the latest developments. Current research is aimed at increasing the thermoelectric figure of merit (ZT) by maximizing the power factor and/or minimizing the thermal conductivity. Attempts at maximizing the power factor include the development of new materials, optimization of existing materials by doping, and the exploration of nanoscale materials. The minimization of ...
A first report of physical properties of the ternary intermetallic compound CeRu 2 Al 10 is given. The electrical resistivity below room temperature shows activated behaviour with a narrow gap of ⊿≃20 K before the onset of a sharp peak in ρ(T) below T* = 27K. The Hall coefficient as well as the thermoelectric power are overall positive, and both increase in a similarly sharp manner below T*. The lattice part of the thermal conductivity indicates phonon coupling of the heat transport at T*, possi...
#1Kamran Behnia (CNRS: Centre national de la recherche scientifique)H-Index: 54
Following the observation of an anomalous Nernst signal in cuprates, the Nernst effect has been explored in a variety of metals and superconductors during the past few years. This paper reviews the results obtained during this exploration, focusing on the Nernst response of normal quasi-particles as opposed to the one generated by superconducting vortices or by short-lived Cooper pairs. Contrary to what has been often assumed, the so-called Sondheimer cancelation does not imply a negligible Nern...
#1Joseph P. Heremans (OSU: Ohio State University)H-Index: 63
#2Vladimir Jovovic (OSU: Ohio State University)H-Index: 13
Last. G. Jeffrey Snyder (California Institute of Technology)H-Index: 112
view all 8 authors...
The efficiency of thermoelectric energy converters is limited by the material thermoelectric figure of merit (zT). The recent advances in zT based on nanostructures limiting the phonon heat conduction is nearing a fundamental limit: The thermal conductivity cannot be reduced below the amorphous limit. We explored enhancing the Seebeck coefficient through a distortion of the electronic density of states and report a successful implementation through the use of the thallium impurity levels in lead...
#1G. Jeffrey Snyder (California Institute of Technology)H-Index: 112
#2Eric S. Toberer (California Institute of Technology)H-Index: 53
Thermoelectric materials, which can generate electricity from waste heat or be used as solid-state Peltier coolers, could play an important role in a global sustainable energy solution. Such a development is contingent on identifying materials with higher thermoelectric efficiency than available at present, which is a challenge owing to the conflicting combination of material traits that are required. Nevertheless, because of modern synthesis and characterization techniques, particularly for nan...
#1Veljko ZlatićH-Index: 25
#2B. HorvatićH-Index: 8
Last. Claas Grenzebach (University of Bremen)H-Index: 5
view all 6 authors...
The temperature dependence of the thermoelectric power (TEP) of metallic systems with cerium and ytterbium ions exhibits characteristic features which we explain by the Coqblin-Schrieffer model (CSM). We specify a given system by the degeneracy and splitting of the crystal-field (CF) levels, the strength of the exchange and potential scattering, and the number of f electrons or f holes; for cerium and ytterbium ions we assume {n}_{f}l~1and {n}_{f}^{\mathrm{hole}}l~1,respectively. The Kondo...
#1Jeffrey S. Dyck (UM: University of Michigan)H-Index: 25
#2Wei Chen (UM: University of Michigan)H-Index: 80
Last. Ctirad UherH-Index: 103
view all 5 authors...
The filled skutterudite compounds based on the binary skutterudite CoSb 3 are currently being investigated for their potential applications as thermoelectric materials. One route to optimization of these compounds is by doping on the Co site. An obvious candidate for an n-type dopant is Ni, since it has one more electron in its valence shell than Co. Up to now, however, only high concentrations of Ni in CoSb 3 have been studied; and the valence of Ni in this compound and its influence on the tra...
Cited By64
#1Anooja Jayaraj (UNT: University of North Texas)
#2Ilaria SiloiH-Index: 7
Last. Marco Buongiorno NardelliH-Index: 40
view all 4 authors...
Regardless of its success, the constant relaxation time approximation has limited validity. Temperature and energy dependent effects are important to match experimental trends even in simple situations. We present the implementation of relaxation time approximation models in the calculation of Boltzmann transport in PAOFLOW 2.0 and apply those to model band-structures. In addition, using a self-consistent fitting of the model parameters to experimental conductivity data, we provide a flexible to...
#1Yasutomo Kajikawa (Shimane University)H-Index: 7
#1Yu Wu (Fudan University)H-Index: 5
#2Bowen Hou (Fudan University)H-Index: 3
Last. Hao Zhang (Fudan University)H-Index: 23
view all 10 authors...
The interactions between electrons and phonons play the key role in determining the carrier transport properties in semiconductors. In this work, comprehensive investigations on full electron–phonon (el–ph) couplings and their influences on carrier mobility and thermoelectric (TE) performances of 2D group IV and V elemental monolayers are performed, and we also analyze the selection rules on el–ph couplings using group theory. For shallow n/p-dopings in Si, Ge, and Sn, ZA/TA/LO phonon modes domi...
ABSTRACT How magnetism affects the Seebeck effect is an important issue widely concerned in the thermoelectric community yet remaining elusive. Based on a thermodynamic analysis of spin degrees of freedom on varied d-electron based ferro- and anti-ferromagnets, we demonstrate that in itinerant or partially itinerant magnetic compounds there exists a generic spin contribution to the Seebeck effect over an extended temperature range from slightly below to well above the magnetic transition tempera...
Abstract A spin-dependent Seebeck diode is theoretically proposed, which consists of the junction with a semiconductor quantum dot sandwiched between the ferromagnetic and nonmagnetic leads. It is shown that both thermoelectric and thermal-spin currents driven by temperature bias exhibit asymmetric I C ( S ) − Δ T characteristics. In the Coulomb blockade regime, anomalous suppression of the thermoelectric (thermal-spin) current is observed at the forward thermal bias direction ( Δ T > 0 ). This ...
#1P Peratheepan (Eastern University (United States))H-Index: 1
#2D Britz (UJ: University of Johannesburg)H-Index: 1
Last. André M. Strydom (UJ: University of Johannesburg)H-Index: 27
view all 3 authors...
The influence of Y- and La-substitution for Ce on the competing Kondo effect and magnetic ordering, as well as on spin dynamics in the Kondo semiconductor CeRu2Al10have been investigated by means of thermal, electronic, and magnetic properties. The parent compound CeRu2Al10is known to be a controversial antiferromagnet with high magnetic ordering temperatureT0= 27 K. A small negative chemical pressure caused by La-doping results rapid suppression ofT0and spin gap energy Δm, compared to a small p...
#1Yu WuH-Index: 5
#2Bowen HouH-Index: 3
Last. Hao Zhang (Fudan University)H-Index: 23
view all 13 authors...
The strategy of band convergence of multi-valley conduction bands or multi-peak valence bands has been widely used to search or improve thermoelectric materials. However, the phonon-assisted intervalley scatterings due to multiple band degeneracy are usually neglected in the thermoelectric community. In this work, we investigate the (thermo)electric properties of non-polar monolayer β- and α-antimonene considering full mode- and momentum-resolved electron–phonon interactions. We also analyze tho...
#1Xiaoyan Liu (Hohai University)H-Index: 4
#2Gang LiaoH-Index: 2
Last. Junqing ZuoH-Index: 2
view all 3 authors...
Bi2Te3 was incorporated in carbon fiber-reinforced cement composites (CFRCs) as thermoelectric-reinforced component via three different doping methods (uniformity volume mixing, gradient volume mix...
#3Hong Chang (Inner Mongolia University)H-Index: 1
#4Roshan Nepal (LSU: Louisiana State University)H-Index: 4
Last. Joanna Blawat (LSU: Louisiana State University)H-Index: 2
view all 9 authors...
Transition metal stannides are usually semiconductors with a narrow band gap. We report experimental investigation on metallic Ir3Sn7-xMnx(x= 0 and 0.56). Single crystal x-ray diffraction refinement indicates that Ir3Sn7-xMnxcrystals form a cubic structure (space groupIm-3m) with the lattice parametera= 9.362(4) A forx= 0 and 9.328(6) A forx= 0.56. The electrical resistivity shows metallic behavior between 2 K and 300 K withT2dependence atT< 30 K forx= 0, reflecting the Fermi-liquid ground state...
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.