Chapter

Thermoelectric oxides: films and heterostructures

Hiromichi Ohta and Kunihito Koumoto

in Multifunctional Oxide Heterostructures

Published in print August 2012 | ISBN: 9780199584123
Published online January 2013 | e-ISBN: 9780191745331 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199584123.003.0010
Thermoelectric oxides: films and heterostructures

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Thermoelectric energy conversion technology to convert waste heat into electricity has received much attention. In addition, metal oxides have recently been considered as thermoelectric power generation materials that can operate at high temperatures on the basis of their potential advantages over heavy metallic alloys in chemical and thermal robustness. This chapter fabricates high quality epitaxial films composed of oxide thermoelectric materials, which are suitable for clarifying the intrinsic properties. It focuses on the thermoelectric properties of two representative oxide epitaxial films, p-type Ca3Co4O9 and n-type SrTiO3, which exhibit the best thermoelectric figures of merit, ZT(=S2·σT·κ-1, S: Seebeck coefficient, σ: electrical conductivity, κ: thermal conductivity, and T: absolute temperature) among oxide thermoelectric materials reported to date. In addition, it introduces the recently discovered giant S of two-dimensional electrons confined within a unit cell layer thickness (~0.4 nm) of SrTiO3.

Keywords: thermoelectric properties; seebeck coefficient; Ca3Co4O9; SrTiO3; superlattice; two-dimensional electron gas; 2DEG; quantum size effect

Chapter.  7254 words.  Illustrated.

Subjects: Condensed Matter Physics

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