Critical thickness for giant thermoelectric Seebeck coefficient of 2DEG confined in SrTiO3/SrTi0.8Nb0.2O3 superlattices

被引：33

作者：

Ohta, Hiromichi ^{[1
,2
]}

Mune, Yoriko ^{[1
]}

Koumoto, Kunihito ^{[1
,2
]}

Mizoguchi, Teruyasu ^{[3
]}

Ikuhara, Yuichi ^{[3
]}

机构：

[1] Nagoya Univ, Grad Sch Engn, Nagoya, Aichi 4648603, Japan

[2] JST, CREST, Kawaguchi, Saitama 3320012, Japan

[3] Univ Tokyo, Inst Engn Innovat, Tokyo 1138656, Japan

来源：

THIN SOLID FILMS | 2008年 / 516卷 / 17期

关键词：

thermoelectric energy conversion; Seebeck coefficient; two-dimensional electron gas (2DEG); SrTiO3; superlattices;

D O I：

10.1016/j.tsf.2007.10.034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Seebeck coefficient (vertical bar S vertical bar) of two-dimensional electron gas (2DEG) confined within (SrTiO3)(LB)/(SrTi0.8Nb0.2O3)(LW) superlattices were measured at room temperature to clarify the critical thicknesses of barrier SrTiO3 (L-B) and well SrTi0.8Nb0.2O3 (L-W) for giant vertical bar S vertical bar [H. Ohta et al., Nat. Mater. 6, 129 (2007)]. The vertical bar S vertical bar values of the superlattices increased proportionally to L-W(-1/2) due to increasing of the density of states near the conduction band edge (quantum size effect), and reached 300 mu V K-1 at L-W = 1 unit cell SrTi0.8Nb0.2O3 (0.39 nm), which is similar to 5 times larger than that of the SrTi0.8Nb0.2O3 bulk (60 mu V K-1). The critical thickness of L-B and L-W for giant vertical bar S vertical bar was clarified to be 16 unit cells (6.25 nm). The best thermoelectric performance can be obtained at (L-B, L-W)=(16, 1). (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：5916 / 5920

页数：5

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