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Thermoelectric properties of Ca3Co4O9 and Ca2.8Bi0.2Co4O9 thin films in their island formation mode

Published online by Cambridge University Press:  17 June 2013

Priyanka Jood ,
Germanas Peleckis ,
Xiaolin Wang  and
Shi Xue Dou
Priyanka Jood*
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
Germanas Peleckis
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
Xiaolin Wang
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
Shi Xue Dou
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
*
a)Address all correspondence to this author. e-mail: joodpriyanka@gmail.com, pj991@uowmail.edu.au
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Abstract

Ca3Co4O9 and Ca2.8Bi0.2Co4O9 thin films were fabricated on LaAlO3 (LAO) substrate using pulsed laser deposition technique and were studied for their thermoelectric (TE) properties in Stranski–Krastanov mode for the first time. The thin films consisted of 3D clusters/islands on a ∼14-nm thick 2D layer with cluster density being higher for Ca2.8Bi0.2Co4O9 thin films. The clusters also represent areas of dislocation and therefore act as carrier scattering centers, which leads to a temperature-activated type conductivity. Seebeck coefficient as high as 136 and 163 μ V/K was measured for the Ca3Co4O9 and Ca2.8Bi0.2Co4O9 thin films, respectively, which is among the highest reported values for this system. The 3D island formation was also found to be useful in reducing the thermal conductivity of the thin film/substrate system by increased phonon scattering. This work shows that the island formation in thin films can be utilized as a means of enhancing TE properties of a thin film system, however, a detailed work including optimization of the film thickness and cluster/inland density is required.

Keywords

thermoelectric materialsoxidesthin filmspulsed laser deposition
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 14 , 28 July 2013 , pp. 1932 - 1939
Copyright
Copyright © Materials Research Society 2013 

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References

REFERENCES

Shikano, M. and Funahashi, R.: Electrical and thermal properties of single-crystalline (Ca2CoO3)0.7CoO2 with a Ca3Co4O9 structure. Appl. Phys. Lett. 82, 1851 (2003).Google Scholar
Yang, W., Yu, S., Jinguang, C., Xianjie, W., and Wenhui, S.: The thermal-transport properties of the Ca3−xAgxCo4O9 system (0≤x≤0.3). J. Phys. Condens. Matter 19, 356216 (2007).Google Scholar
Xu, G., Funahashi, R., Shikano, M., Matsubara, I., and Zhou, Y.: Thermoelectric properties of the Bi- and Na-substituted Ca3Co4O9 system. Appl. Phys. Lett. 80, 3760 (2002).Google Scholar
Mikami, M., Ando, N., Guilmeau, E., and Funahashi, R.: Effect of Bi substitution on microstructure and thermoelectric properties of polycrystalline [Ca2CoO3]pCoO2 . Jpn. J. Appl. Phys., Part 1 45, 4152 (2006).Google Scholar
Liu, Y., Lin, Y., Jiang, L., Nan, C-W., and Shen, Z.: Thermoelectric properties of Bi3+ substituted Co-based misfit-layered oxides. J. Electroceram. 21, 748 (2008).CrossRefGoogle Scholar
Zhang, Y., Zhang, J., and Lu, Q.: Synthesis of highly textured Ca3Co4O9 ceramics by spark plasma sintering. Ceram. Int. 33, 1305 (2007).Google Scholar
Zhou, Y., Matsubara, I., Horii, S., Takeuchi, T., Funahashi, R., Shikano, M., Shimoyama, J-I., Kishio, K., Shin, W., Izu, N., and Murayama, N.: Thermoelectric properties of highly grain-aligned and densified Co-based oxide ceramics. J. Appl. Phys. 93, 2653 (2003).Google Scholar
Prevel, M., Lemonnier, S., Klein, Y., Hebert, S., Chateigner, D., Ouladdiaf, B., and Noudem, J.G.: Textured Ca3Co4O9 thermoelectric oxides by thermoforging process. J. Appl. Phys. 98, 093706 (2005).Google Scholar
Qiao, Q., Gulec, A., Paulauskas, T., Kolesnik, S., Dabrowski, B., Ozdemir, M., Boyraz, C., Mazumdar, D., Gupta, A., and Klie, R.F.: Effect of substrate on the atomic structure and physical properties of thermoelectric Ca3Co4O9 thin films. J. Phys. Condens. Matter 23, 305005 (2011).Google Scholar
Sun, T., Hng, H.H., Yan, Q., and Ma, J.: Effects of pulsed laser deposition conditions on the microstructure of Ca3Co4O9 thin films. J. Electron. Mater. 39, 1611 (2010).Google Scholar
Sakai, A., Kanno, T., Yotsushashi, S., Odagawa, A., and Adachi, H.: Control of epitaxial growth orientation and anisotropic thermoelectric properties of misfit-type Ca3Co4O9 thin films. Jpn. J. Appl. Phys. 44, L966 (2005).Google Scholar
Sugiura, K., Ohta, H., Nomura, K., Hirano, M., Hosono, H., and Koumoto, K.: High electrical conductivity of layered cobalt oxide Ca3Co4O9 epitaxial films grown by topotactic ion-exchange method. Appl. Phys. Lett. 89, 032111 (2006).Google Scholar
Hicks, L.D. and Dresselhaus, M.S.: Effect of quantum-well structures on the thermoelectric figure of merit. Phys. Rev. B 47, 12727 (1993).Google Scholar
Mikami, M., Chong, K., Miyazaki, Y., Kajitani, T., Inoue, T., Sodeoka, S., and Funahashi, R.: Bi-substitution effects on crystal structure and thermoelectric properties of Ca3Co4O9 single crystals. Jpn. J. Appl. Phys. 45, 4131 (2006).Google Scholar
Sun, T., Hng, H.H., Yan, Q.Y., and Ma, J.: Enhanced high temperature thermoelectric properties of Bi-doped c-axis oriented Ca3Co4O9 thin films by pulsed laser deposition. J. Appl. Phys. 108, 083709 (2010).Google Scholar
Zhou, Y., Matsubara, I., Shin, W., Izu, N., and Murayama, N.: Effect of grain size on electric resistivity and thermopower of (Ca2.6Bi0.4)Co4O9 thin films. J. Appl. Phys. 95, 625 (2004).Google Scholar
Ohtake, M., Nukaga, Y., Kirino, F., and Futamoto, M.: Effects of substrate temperature and Cu underlayer thickness on the formation of SmCo5(0001) epitaxial thin films. J. Appl. Phys. 107, 09A706 (2010).Google Scholar
Sathyamoorthy, R., Narayandaas, S.K., and Mangalaraj, D.: Effect of substrate temperature on the structure and optical properties of CdTe thin film. Sol. Energy Mater. Sol. Cells 76, 339 (2003).Google Scholar
Zhang, Y.F., Zhang, J.X., Lu, Q.M., and Zhang, Q.Y.: Synthesis and characterization of Ca3Co4O9 nanoparticles by citrate sol-gel method. Mater. Lett. 60, 2443 (2006).Google Scholar
Gilmer, G.H., Huang, H., and Roland, C.: Thin film deposition: Fundamentals and modeling. Comp. Mater. Sci. 12, 354 (1998).Google Scholar
Cieniek, L. and Kac, S.: Influence of Ca content on the structure and properties οf (Co, Ca)O thin films deposited by PLD technique. Acta Phys. Pol. A 117, 803 (2010).Google Scholar
Hu, Y.F., Si, W.D., Sutter, E., and Li, Q.: In situ growth of c-axis oriented Ca3Co4O9 thin films on Si (100). Appl. Phys. Lett. 86, 082103 (2005).Google Scholar
Chang, C.C., Wu, X.D., Ramesh, R., Xi, X.X., Ravi, T.S., Venkatesan, T., Hwang, D.M., Muenchausen, R.E., Foltyn, S., and Nogar, N.S.: Origin of surface roughness for c-axis oriented Y-Ba-Cu-O superconducting films. Appl. Phys. Lett. 57, 1814 (1990).Google Scholar
Hafez, M.A., Elamrawi, K.A., and Elsayed-Ali, H.E.: Pulsed laser deposition of InP thin films on sapphire(1 0 0 0) and GaAs(1 0 0). Appl. Surf. Sci. 233, 42 (2004).Google Scholar
Ohta, H., Sugiura, K., and Koumoto, K.: Recent progress in oxide thermoelectric materials: p-type Ca3Co4O9 and n-type SrTiO3 . Inorg. Chem. 47, 8429 (2008).CrossRefGoogle ScholarPubMed
Sun, T., Ma, J., Yan, Q.Y., Huang, Y.Z., Wang, J.L., and Hng, H.H.: Influence of pulsed laser deposition rate on the microstructure and thermoelectric properties of Ca3Co4O9 thin films. J. Cryst. Growth 311, 4123 (2009).Google Scholar
Kanno, T., Yotsuhashi, S., and Adachi, H.: Anisotropic thermoelectric properties in layered cobaltite AxCoO2 (A = Sr and Ca) thin films. Appl. Phys. Lett. 85, 739 (2004).Google Scholar
Hughes, R.C.: Time-resolved hole transport in a-SiO2 . Phys. Rev. B 15, 2012 (1977).Google Scholar
Heremans, J.P., Thrush, C.M., and Morelli, D.T.: Thermopower enhancement in PbTe with Pb precipitates. J. Appl. Phys. 98, 063703 (2005).Google Scholar
Rogacheva, E.I., Nashchekina, O.N., Vekhov, Y.O., Dresselhaus, M.S., and Cronin, S.B.: Effect of thickness on the thermoelectric properties of PbS thin films. Thin Solid Films 423, 115 (2003).CrossRefGoogle Scholar