Growth and Characterization of Germanium-based type I Clathrate Thin Films Deposited by Pulsed Laser Ablation

Abstract

Thin films of clathrate material have been grown using the laser ablation technique on a variety of substrates. Films deposited on silicon substrates exhibited a significant deficiency of Ga and Ge while the stoichiometry was preserved in films deposited on quartz, sapphire, and glass substrates. Ablation characteristics of the clathrate target for laser radiation at three different wavelengths in the UV, visible and IR were studied. The UV and IR laser wavelengths produce low ablation thresholds and high growth rates. Crystalline films were obtained above a growth temperature of 400°C. Conductivity measurements on the films at low current injection (<40 µA) showed semiconducting behavior. At high currents the films demonstrated a semiconductor-to-metal transition for temperatures lower than 150 K.

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References

  1. 1.

    Semiconductors and Semimetals, V. 69, 70, & 71, ed. T.M. Tritt, (Academic Press, 2001).

    Google Scholar 

  2. 2.

    G.A. Slack, “New Materials and Performance Limits for Thermoelctric Cooling,” CRC Handbook of Thermoelectrics, ed. D.M. Rowe (CRC Press, 1995), pp. 407–440.

    Google Scholar 

  3. 3.

    G.S. Nolas, D.T. Morelli, and T.M. Tritt, Annu. Rev. Mater. Sci. 29, 89 (1999).

    CAS  Article  Google Scholar 

  4. 4.

    C. Uher, “Skutterudites: Prospective Novel Thermoelectrics,” Semiconductors and Semimetals, V. 69, ed. T.M. Tritt (Academic Press, 2001), pp. 139–253.

    Google Scholar 

  5. 5.

    G.A. Slack, Mater. Res. Soc. Symp. Proc. 478, 47 (1997).

    CAS  Article  Google Scholar 

  6. 6.

    G.S. Nolas, J.L. Cohn, G.A. Slack, and S.B. Schujman, Appl. Phys. Lett. 73, 178 (1998).

    CAS  Article  Google Scholar 

  7. 7.

    C. Cros, M. Pouchard, and P. Hagenmuller, J. Solid State Chem. 2, 570 (1970).

    CAS  Article  Google Scholar 

  8. 8.

    J.L Cohn, G.S. Nolas, V. Fessatidis, T.H. Metcalf, and G.A. Slack, Phys. Rev. Lett. 82, 779 (1999).

    CAS  Article  Google Scholar 

  9. 9.

    S. Witanachchi, K. Ahmed, P. Sakthivel and P. Mukherjee, Applied Physics Lettters, 66, 1469–1471 (1995).

    CAS  Article  Google Scholar 

  10. 10.

    P. Mukherjee, J.B. Cuff and S. Witanachchi, J. Applied Surface Science, 127–129, 620 (1998).

    Article  Google Scholar 

  11. 11.

    P. Mukherjee, Shudong Chen, J. B. Cuff, P. Sakthivel, S. Witanachchi, Journal of Applied Physics, Volume 91, Issue 4, 1828–1836, (2002).

    CAS  Article  Google Scholar 

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Witanachchi, S., Hyde, R., Nagaraja, H.S. et al. Growth and Characterization of Germanium-based type I Clathrate Thin Films Deposited by Pulsed Laser Ablation. MRS Online Proceedings Library 886, 1003 (2005). https://doi.org/10.1557/PROC-0886-F10-03

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