Oxide Thermoelectric Materials: A Nanostructuring Approach

Koumoto, Kunihito; Wang, Yifeng; Zhang, Ruizhi; Kosuga, Atsuko; Funahashi, Ryoji

doi:10.1146/annurev-matsci-070909-104521

Cited by 432 publications

(340 citation statements)

References 88 publications

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“…29 Hole mobilities at zero Kelvin can be calculated from the relation l ¼ es=m Ã , where the relaxation time s for AgTaO 3 /STO is assumed to be 35 fs, following estimations in the literature. 30,31 We obtain for our hole gas l ¼ 18:6 cm À2 V À1 s À1 , which is a similar magnitude as reported for the highly mobile electron gas in LaTiO 3 / STO. 30 The confinement of the metallic states to a very narrow region around the p-type IF, as compared to related HSs such as KTaO 3 /STO, NaTaO 3 /STO, and NaNbO 3 /STO, is due to the high electronegativity of Ag.…”

supporting

confidence: 86%

High mobility of the strongly confined hole gas in AgTaO3/SrTiO3

Nazir

Kahaly

Schwingenschlögl

2012

Applied Physics Letters

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A theoretical study of the two-dimensional hole gas at the (AgO)−/(TiO2)0 p-type interface in the AgTaO3/SrTiO3 (001) heterostructure is presented. The Ag 4d states strongly hybridize with the O 2p states and contribute to the hole gas. It is demonstrated that the holes are confined to an ultra thin layer (∼4.9Å) with a considerable carrier density of ∼1014cm-2. We estimate a hole mobility of 18.6 cm2 V−1 s−1, which is high enough to enable device applications.

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supporting

confidence: 86%

High mobility of the strongly confined hole gas in AgTaO3/SrTiO3

Nazir

Kahaly

Schwingenschlögl

2012

Applied Physics Letters

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“…To this end, the focus of this review article is on examining the metal oxide potentials for TE power generation with an emphasis on materials with high power factor. Effective doping strategies in achieving high power factor are highlighted for various metal oxides, particularly, Na x CoO 2 [15], Ca 3 Co 4 O 9 [16], BiCuSeO [17], CaMnO 3 [18], SrTiO 3 [19], ZnO-based [20], SnO 2 -based [21], and In 2 O 3 -based [22] alloys. More broadly, recent advancement of metal oxides for potential commercial applications in thermal-and electrical-related fields is summarized, which includes TE power generators, solar cells, and sensors.…”

Section: Introductionmentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

119

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Metal oxides are widely used in many applications such as thermoelectric, solar cells, sensors, transistors, and optoelectronic devices due to their outstanding mechanical, chemical, electrical, and optical properties. For instance, their high Seebeck coefficient, high thermal stability, and earth abundancy make them suitable for thermoelectric power generation, particularly at a high-temperature regime. In this article, we review the recent advances of developing high electrical properties of metal oxides and their applications in thermoelectric, solar cells, sensors, and other optoelectronic devices. The materials examined include both narrow-band-gap (e.g., Na x CoO 2 , Ca 3 Co 4 O 9 , BiCuSeO, CaMnO 3 , SrTiO 3 ) and wide-band-gap materials (e.g., ZnO-based, SnO 2 -based, In 2 O 3 -based). Unlike previous review articles, the focus of this study is on identifying an effective doping mechanism of different metal oxides to reach a high power factor. Effective dopants and doping strategies to achieve high carrier concentration and high electrical conductivities are highlighted in this review to enable the advanced applications of metal oxides in thermoelectric power generation and beyond.

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“…It offers simple and compact solidstate energy-conversion devices that are adaptive in a variety of situations to utilize various kinds of waste heat such as car engine and garbage furnace. In this context, oxide thermoelectrics is potentially promising because it is fairly stable at high temperatures in air, and since the discovery of the good thermoelectric properties of the layered cobalt oxide Na x CoO 2 [3], oxide thermoelectrics including transitionmetal elements has been intensively studied in the past decade [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric transport in the layered Ca3Co4–xRhxO9 single crystals

Ikeda

Saito

Okazaki

2016

Journal of Applied Physics

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We have examined an isovalent Rh substitution effect on the transport properties of the thermoelectric oxide Ca 3 Co 4 O 9 using single-crystalline form. With increasing Rh content x, both the electrical resistivity and the Seebeck coefficient change systematically up to x = 0.6 for Ca 3 Co 4−x Rh x O 9 samples. In the Fermi-liquid regime where the resistivity behaves as ρ = ρ 0 + AT 2 around 120 K, the A value decreases with increasing Rh content, indicating that the correlation effect is weakened by Rh 4d electrons with extended orbitals. We find that, in contrast to such a weak correlation effect observed in the resistivity of Rh-substituted samples, the low-temperature Seebeck coefficient is increased with increasing Rh content, which is explained with a possible enhancement of a pseudogap associated with the short-range order of spin density wave. In high-temperature range above room temperature, we show that the resistivity is largely suppressed by Rh substitution while the Seebeck coefficient becomes almost temperature-independent, leading to a significant improvement of the power factor in Rh-substituted samples. This result is also discussed in terms of the differences in the orbital size and the associated spin state between Co 3d and Rh 4d electrons.

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Oxide Thermoelectric Materials: A Nanostructuring Approach

Cited by 432 publications

References 88 publications

High mobility of the strongly confined hole gas in AgTaO3/SrTiO3

High mobility of the strongly confined hole gas in AgTaO3/SrTiO3

Metal oxides for thermoelectric power generation and beyond

Thermoelectric transport in the layered Ca3Co4–xRhxO9 single crystals

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