Recent progress in oxide thermoelectric materials:: p-type Ca3CO4O9 and n-type SrTiO3-
Recent progress in oxide thermoelectric materials:: p-type Ca3CO4O9 and n-type SrTiO3-
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DOI：
10.1021/ic800644x
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发表时间：
2008-10-06
影响因子：
4.6
通讯作者：
Koumoto, Kunihito
中科院分区：
文献类型：
--
作者：
Ohta, Hiromichi;Sugiura, Kenji;Koumoto, Kunihito
将废热转化为电能的热电能源转换技术备受关注。此外，金属氧化物最近被认为是可以在高温下运行的热电发电材料，因为它们在化学和热稳定性方面比重金属合金具有潜在优势。我们制造了由氧化物热电材料组成的高质量外延薄膜，适合阐明内在的“真实”特性。本综述重点关注两种具有代表性的氧化物外延薄膜（p型Ca3CO4O9和n型SrTiO3）的热电性能，它们在迄今为止报道的氧化物热电材料中表现出最佳的热电品质因数ZT（=S-2 sigma T kappa（-1），S =塞贝克系数，a =电导率，K =热导率，T =绝对温度）。此外，我们还介绍了最近发现的二维电子巨S，其被限制在SrTiO3晶胞层厚度（类似于0.4 nm）内。
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. We have fabricated high-quality epitaxial films composed of oxide thermoelectric materials that are suitable for clarifying the intrinsic "real" properties. This review 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(=S-2 sigma T kappa(-1), S = Seebeck coefficient, a = electrical conductivity, K = thermal conductivity, and T = absolute temperature) among oxide thermoelectric materials reported to date. In addition, we introduce the recently discovered giant S of two-dimensional electrons confined within a unit cell layer thickness (similar to 0.4 nm) of SrTiO3.