Preparation and Characterization of Ca_3Co_4O_9 Thin Films on Polycrystalline Al_2O_3 Substrates by Chemical Solution Deposition  

作　　者：Yankun Fu Xianwu Tang Jie Yang Hongbin Jian Xuebin Zhu Yuping Sun 

机构地区：[1]Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences [2]College of Science, Shandong University of Science and Technology

出　　处：《Journal of Materials Science & Technology》2013年第1期13-16,共4页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 50802096, 10904150 and10904151)

摘　　要：Ca3Co409 thin films have been first prepared on polycrystalline AI203 substrates using chemical solution deposition method by multiple annealing processing. It is observed that the derived thin films are c-axis oriented although the substrates are polycrystalline AI203 substrates, suggesting the self-assembled c-axis orientation. The annealing temperature effects on the properties are investigated and discussed. The best performances are attributed to the 850 ℃-annealed sample, whose resistivity, Seebeck coefficient and power factor at 300 K are 7.4 mΩ cm, 117 μV/K and 0.18 mW/m K-2 respectively, which is even better than those of the thin films deposited on single crystal substrates. The results will provide an effective route to optimize the properties of Ca3Co409 thin films using chemical solution deposition by multiple annealing processing even the substrates are polycrystalline.Ca3Co409 thin films have been first prepared on polycrystalline AI203 substrates using chemical solution deposition method by multiple annealing processing. It is observed that the derived thin films are c-axis oriented although the substrates are polycrystalline AI203 substrates, suggesting the self-assembled c-axis orientation. The annealing temperature effects on the properties are investigated and discussed. The best performances are attributed to the 850 ℃-annealed sample, whose resistivity, Seebeck coefficient and power factor at 300 K are 7.4 mΩ cm, 117 μV/K and 0.18 mW/m K-2 respectively, which is even better than those of the thin films deposited on single crystal substrates. The results will provide an effective route to optimize the properties of Ca3Co409 thin films using chemical solution deposition by multiple annealing processing even the substrates are polycrystalline.

关 键 词：Chemical solution deposition THERMOELECTRIC COBALTATE 

分 类 号：TB43[一般工业技术]