Parallel syntheses and thermoelectric properties of Ce-doped SrTiO3 thin films

被引：23

作者：

Yamada, Y. F. ^{[1
]}

Ohtomo, A. ^{[1
,2
]}

Kawasaki, M. ^{[1
,3
]}

机构：

[1] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan

[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[3] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

APPLIED SURFACE SCIENCE | 2007年 / 254卷 / 03期

关键词：

SrTiO(3); thermoelectric; combinatorial chemistry; conductivity; seebeck effect; thin films; pulsed-laser deposition;

D O I：

10.1016/j.apsusc.2007.04.089

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thermoelectric properties of single crystalline Ce(x)Sr(1-x)TiO(3) films (0 <= x <= 0.5) have been studied by using combinatorial pulsed-laser deposition. Temperature gradient method was used for identifying an optimum growth temperature for SrTiO(3) homoepitaxial growth, at which both oxygen stoichiometry and persisting layer-by-layer growth mode could be accomplished. Electrical conductivity (sigma) and Seebeck coefficient (S) were measured at room temperature for the composition-spread films grown at the optimized temperature and found to be considerably higher than those reported for bulk poly-crystalline compounds. Hall measurement revealed that carrier density linearly increased with increasing x, suggesting that a trivalent Ce ions substituted divalent Sr ions to supply electrons. A maximum power factor (S(2)sigma) was obtained for the x = 0.2 film, being 7 and 14 mu W/K(2) cm at 300 and 900 K, respectively. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：768 / 771

页数：4

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