拓扑定向离子交换法制备层状钴氧化物外延膜的热电性能

2006 25th International Conference on Thermoelectrics Pub Date : 2006-08-01 DOI:10.1109/ICT.2006.331290

K. Sugiura, H. Ohta, K. Nomura, T. Saito, Y. Ikuhara, M. Hirano, H. Hosono, K. Koumoto

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引用次数: 2

摘要

以Na0.8CoO2外延膜为前驱体，采用拓扑离子交换法在α - al2o3衬底(0001)面制备了层状氧化钴ca3co4o9外延膜。高分辨率x射线衍射和原子力显微镜测量表明，该薄膜是高质量的(001)取向ca3co4o9，表面形貌呈阶梯状。该薄膜具有2.95 × 102 cm-1的高电导率和~+125 muVK-1的大塞贝克系数，在300 K时热电功率因数为4.5 × 10-4 Wm-1 K-1

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Thermoelectric Properties of Epitaxial Films of Layered Cobalt Oxides Fabricated by Topotactic Ion-Exchange Methods

Epitaxial film of a layered cobalt oxide, Ca₃Co₄O₉, was fabricated on a (0001)-face of alpha-Al₂O₃ substrate by a topotactic ion exchange method using a Na_0.8CoO₂ epitaxial film as a precursor. High-resolution X-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca ₃Co₄O₉ with stepped & terraced surface morphology. The film exhibits a high electrical conductivity of 2.95 times 10² Scm^-1 and a large Seebeck coefficient of ~+125 muVK^-1, which leads to the thermoelectric power factor of 4.5 times 10^-4 Wm^-1K^-1 at 300 K

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2006 25th International Conference on Thermoelectrics

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