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Laser-induced transverse voltage effect and thermopower anisotropy of c-axis inclined Ca3Co4O9 thin film

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Abstract

Ca3Co4O9+δ thin films were prepared on 5° vicinal cut LaAlO3 (001) substrates by pulsed laser deposition and subsequently annealed at various temperatures. Under the irradiation energy density of 8 mJ cm−2, a large laser-induced transverse voltage (LITV) signal with 6.4 V peak voltage and 33 ns rising edge was obtained in the 800 °C annealed film, which was nearly 11 times larger and 2 times faster than that in the as-grown film without annealing (0.54 V, 100 ns). The results suggested that the significant enhancement of LITV by annealing was mainly owing to the improved crystallization and electrical transport property. Based on the LITV results and heat flow model, a nearly intrinsic Seebeck coefficient anisotropy ΔS = |S ab–S c | ≈ 33.4 μV K−1 was obtained, demonstrating the c-axis inclined Ca3Co4O9+δ thin film with large thermopower anisotropy has great application potentials in high sensitive and fast response thermoelectric detectors.

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Acknowledgements

We gratefully acknowledge the support for this work from the National Natural Science Foundation of China (Grant No. 51462017, No. 51262016).

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Authors and Affiliations

  1. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, People’s Republic of China

    Shijin Song, Lan Yu, Jianli Hu, Anan Liu & Yi Zhong

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  1. Shijin Song
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  2. Lan Yu
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Correspondence to Lan Yu.

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Song, S., Yu, L., Hu, J. et al. Laser-induced transverse voltage effect and thermopower anisotropy of c-axis inclined Ca3Co4O9 thin film. Appl. Phys. A 123, 595 (2017). https://doi.org/10.1007/s00339-017-1188-7

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