Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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In-Plane Thermoelectric Properties of InGaAlAs Thin Film with Embedded ErAs Nanoparticles

ErAs 나노입자가 첨가된 InGaAlAs 박막의 평면정렬방향으로의 열전특성

  • Lee, Yong-Joong (School of Mechanical Engineering, Kyungpook National University)
  • 이영중 (경북대학교 기계공학부)
  • Received : 2011.07.06
  • Accepted : 2011.07.30
  • Published : 2011.08.27
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Abstract

Microelectromechanical systems (MEMS)-fabricated suspended devices were used to measure the in-plane electrical conductivity, Seebeck coefficient, and thermal conductivity of 304 nm and 516 nm thick InGaAlAs films with 0.3% ErAs nanoparticle inclusions by volume. The suspended device allows comprehensive thermoelectric property measurements from a single thin film or nanowire sample. Both thin film samples have identical material compositions and the sole difference is in the sample thickness. The measured Seebeck coefficient, electrical conductivity, and thermal conductivity were all larger in magnitude for the thicker sample. While the relative change in values was dependent on the temperature, the thermal conductivity demonstrated the largest decrease for the thinner sample in the measurement temperature range of 325 K to 425 K. This could be a result of the increased phonon scattering due to the surface defects and included ErAs nanoparticles. Similar to the results from other material systems, the combination of the measured data resulted in higher values of the thermoelectric figure of merit (ZT) for the thinner sample; this result supports the theory that the reduced dimensionality, such as in twodimensional thin films or one-dimensional nanowires, can enhance the thermoelectric figure of merit compared with bulk threedimensional materials. The results strengthen and provide a possible direction in locating and optimizing thermoelectric materials for energy applications.

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References

  1. L. D. Hicks and M. S. Dresselhaus, Phys. Rev. B, 47, 16631 (1993). https://doi.org/10.1103/PhysRevB.47.16631
  2. N. Mingo, Appl. Phys. Lett., 84, 2652 (2004). https://doi.org/10.1063/1.1695629
  3. T. Koga, X. Sun, S. B. Cronin and M. S. Dresselhaus, Appl. Phys. Lett., 73, 2950 (1998). https://doi.org/10.1063/1.122640
  4. D. A. Broido and T. L. Reinecke, Phys. Rev. B Condens. Matter, 64, 045324 (2001). https://doi.org/10.1103/PhysRevB.64.045324
  5. G. Chen, M. S. Dresselhaus, G. Dresselhaus, J. P. Fleurial and T. Caillat, Int. Mater. Rev., 48, 45 (2003). https://doi.org/10.1179/095066003225010182
  6. L. Shi, D. Li, C. Yu, W. Jang, D. Kim, Z. Yao, P. Kim and A. Majumdar, J. Heat Tran., 125, 881 (2003). https://doi.org/10.1115/1.1597619
  7. J. M. Zide, D. O. Klenov, S. Stemmer, A. C. Gossard, G. Zeng, J. E. Bowers, D. Vashaee and A. Shakouri, Appl. Phys. Lett., 87, 112102 (2005). https://doi.org/10.1063/1.2043241
  8. G. Zeng, J. H. Bahk, J. E. Bowers, J. M. O. Zide, A. C. Gossard, Z. Bian, R. Singh, A. Shakouri, W. Kim, S. L. Singer and A. Majumdar, Appl. Phys. Lett., 91, 263510 (2007). https://doi.org/10.1063/1.2828042
  9. W. Kim, S. L. Singer, A. Majumdar, D. Vashaee, Z. Bian, A. Shakouri, G. Zeng, J. E. Bowers, J. M. O. Zide and A. C. Gossard, Appl. Phys. Lett., 88, 242107 (2006). https://doi.org/10.1063/1.2207829
  10. A. Mavrokefalos, M. T. Pettes, F. Zhou and L. Shi, Rev. Sci. Instrum., 78, 034901 (2007). https://doi.org/10.1063/1.2712894
  11. S. L. Singer, W. Kim, A. Majumdar, J. M. O. Zide and A. C. Gossard, in Proceedings of the sixth International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (Berkeley, CA, USA, November 2006) p193.
  12. A. I. Hochbaum, R. Chen, R. D. Delgado, W. Liang, E. C. Garnett, M. Najarian, A. Majumdar and P. Yang, Nature, 451, 163 (2008). https://doi.org/10.1038/nature06381